includes/GlobalFunctions.php

   1 <?php
   2
   3 if ( !defined( 'MEDIAWIKI' ) ) {
   4         die( "This file is part of MediaWiki, it is not a valid entry point" );
   5 }
   6
   7 /**
   8  * Global functions used everywhere
   9  */
  10
  11 require_once dirname(__FILE__) . '/normal/UtfNormalUtil.php';
  12
  13 // Hide compatibility functions from Doxygen
  14 /// @cond
  15
  16 /**
  17  * Compatibility functions
  18  *
  19  * We more or less support PHP 5.0.x and up.
  20  * Re-implementations of newer functions or functions in non-standard
  21  * PHP extensions may be included here.
  22  */
  23 if( !function_exists('iconv') ) {
  24         # iconv support is not in the default configuration and so may not be present.
  25         # Assume will only ever use utf-8 and iso-8859-1.
  26         # This will *not* work in all circumstances.
  27         function iconv( $from, $to, $string ) {
  28                 if(strcasecmp( $from, $to ) == 0) return $string;
  29                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  30                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  31                 return $string;
  32         }
  33 }
  34
  35 if ( !function_exists( 'mb_substr' ) ) {
  36         /**
  37          * Fallback implementation for mb_substr, hardcoded to UTF-8.
  38          * Attempts to be at least _moderately_ efficient; best optimized
  39          * for relatively small offset and count values -- about 5x slower
  40          * than native mb_string in my testing.
  41          *
  42          * Larger offsets are still fairly efficient for Latin text, but
  43          * can be up to 100x slower than native if the text is heavily
  44          * multibyte and we have to slog through a few hundred kb.
  45          */
  46         function mb_substr( $str, $start, $count='end' ) {
  47                 if( $start != 0 ) {
  48                         $split = mb_substr_split_unicode( $str, intval( $start ) );
  49                         $str = substr( $str, $split );
  50                 }
  51
  52                 if( $count !== 'end' ) {
  53                         $split = mb_substr_split_unicode( $str, intval( $count ) );
  54                         $str = substr( $str, 0, $split );
  55                 }
  56
  57                 return $str;
  58         }
  59
  60         function mb_substr_split_unicode( $str, $splitPos ) {
  61                 if( $splitPos == 0 ) {
  62                         return 0;
  63                 }
  64
  65                 $byteLen = strlen( $str );
  66
  67                 if( $splitPos > 0 ) {
  68                         if( $splitPos > 256 ) {
  69                                 // Optimize large string offsets by skipping ahead N bytes.
  70                                 // This will cut out most of our slow time on Latin-based text,
  71                                 // and 1/2 to 1/3 on East European and Asian scripts.
  72                                 $bytePos = $splitPos;
  73                                 while ($bytePos < $byteLen && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  74                                         ++$bytePos;
  75                                 $charPos = mb_strlen( substr( $str, 0, $bytePos ) );
  76                         } else {
  77                                 $charPos = 0;
  78                                 $bytePos = 0;
  79                         }
  80
  81                         while( $charPos++ < $splitPos ) {
  82                                 ++$bytePos;
  83                                 // Move past any tail bytes
  84                                 while ($bytePos < $byteLen && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  85                                         ++$bytePos;
  86                         }
  87                 } else {
  88                         $splitPosX = $splitPos + 1;
  89                         $charPos = 0; // relative to end of string; we don't care about the actual char position here
  90                         $bytePos = $byteLen;
  91                         while( $bytePos > 0 && $charPos-- >= $splitPosX ) {
  92                                 --$bytePos;
  93                                 // Move past any tail bytes
  94                                 while ($bytePos > 0 && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  95                                         --$bytePos;
  96                         }
  97                 }
  98
  99                 return $bytePos;
 100         }
 101 }
 102
 103 if ( !function_exists( 'mb_strlen' ) ) {
 104         /**
 105          * Fallback implementation of mb_strlen, hardcoded to UTF-8.
 106          * @param string $str
 107          * @param string $enc optional encoding; ignored
 108          * @return int
 109          */
 110         function mb_strlen( $str, $enc="" ) {
 111                 $counts = count_chars( $str );
 112                 $total = 0;
 113
 114                 // Count ASCII bytes
 115                 for( $i = 0; $i < 0x80; $i++ ) {
 116                         $total += $counts[$i];
 117                 }
 118
 119                 // Count multibyte sequence heads
 120                 for( $i = 0xc0; $i < 0xff; $i++ ) {
 121                         $total += $counts[$i];
 122                 }
 123                 return $total;
 124         }
 125 }
 126
 127
 128 if( !function_exists( 'mb_strpos' ) ) {
 129         /**
 130          * Fallback implementation of mb_strpos, hardcoded to UTF-8.
 131          * @param $haystack String
 132          * @param $needle String
 133          * @param $offset String: optional start position
 134          * @param $encoding String: optional encoding; ignored
 135          * @return int
 136          */
 137         function mb_strpos( $haystack, $needle, $offset = 0, $encoding="" ) {
 138                 $needle = preg_quote( $needle, '/' );
 139
 140                 $ar = array();
 141                 preg_match( '/'.$needle.'/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
 142
 143                 if( isset( $ar[0][1] ) ) {
 144                         return $ar[0][1];
 145                 } else {
 146                         return false;
 147                 }
 148         }
 149 }
 150
 151 if( !function_exists( 'mb_strrpos' ) ) {
 152         /**
 153          * Fallback implementation of mb_strrpos, hardcoded to UTF-8.
 154          * @param $haystack String
 155          * @param $needle String
 156          * @param $offset String: optional start position
 157          * @param $encoding String: optional encoding; ignored
 158          * @return int
 159          */
 160         function mb_strrpos( $haystack, $needle, $offset = 0, $encoding = "" ) {
 161                 $needle = preg_quote( $needle, '/' );
 162
 163                 $ar = array();
 164                 preg_match_all( '/'.$needle.'/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
 165
 166                 if( isset( $ar[0] ) && count( $ar[0] ) > 0 &&
 167                     isset( $ar[0][count($ar[0])-1][1] ) ) {
 168                         return $ar[0][count($ar[0])-1][1];
 169                 } else {
 170                         return false;
 171                 }
 172         }
 173 }
 174
 175 // Support for Wietse Venema's taint feature
 176 if ( !function_exists( 'istainted' ) ) {
 177         function istainted( $var ) {
 178                 return 0;
 179         }
 180         function taint( $var, $level = 0 ) {}
 181         function untaint( $var, $level = 0 ) {}
 182         define( 'TC_HTML', 1 );
 183         define( 'TC_SHELL', 1 );
 184         define( 'TC_MYSQL', 1 );
 185         define( 'TC_PCRE', 1 );
 186         define( 'TC_SELF', 1 );
 187 }
 188 /// @endcond
 189
 190
 191 /**
 192  * Like array_diff( $a, $b ) except that it works with two-dimensional arrays.
 193  */
 194 function wfArrayDiff2( $a, $b ) {
 195         return array_udiff( $a, $b, 'wfArrayDiff2_cmp' );
 196 }
 197 function wfArrayDiff2_cmp( $a, $b ) {
 198         if ( !is_array( $a ) ) {
 199                 return strcmp( $a, $b );
 200         } elseif ( count( $a ) !== count( $b ) ) {
 201                 return count( $a ) < count( $b ) ? -1 : 1;
 202         } else {
 203                 reset( $a );
 204                 reset( $b );
 205                 while( ( list( $keyA, $valueA ) = each( $a ) ) && ( list( $keyB, $valueB ) = each( $b ) ) ) {
 206                         $cmp = strcmp( $valueA, $valueB );
 207                         if ( $cmp !== 0 ) {
 208                                 return $cmp;
 209                         }
 210                 }
 211                 return 0;
 212         }
 213 }
 214
 215 /**
 216  * Seed Mersenne Twister
 217  * No-op for compatibility; only necessary in PHP < 4.2.0
 218  */
 219 function wfSeedRandom() {
 220         /* No-op */
 221 }
 222
 223 /**
 224  * Get a random decimal value between 0 and 1, in a way
 225  * not likely to give duplicate values for any realistic
 226  * number of articles.
 227  *
 228  * @return string
 229  */
 230 function wfRandom() {
 231         # The maximum random value is "only" 2^31-1, so get two random
 232         # values to reduce the chance of dupes
 233         $max = mt_getrandmax() + 1;
 234         $rand = number_format( (mt_rand() * $max + mt_rand())
 235                 / $max / $max, 12, '.', '' );
 236         return $rand;
 237 }
 238
 239 /**
 240  * We want some things to be included as literal characters in our title URLs
 241  * for prettiness, which urlencode encodes by default.  According to RFC 1738,
 242  * all of the following should be safe:
 243  *
 244  * ;:@&=$-_.+!*'(),
 245  *
 246  * But + is not safe because it's used to indicate a space; &= are only safe in
 247  * paths and not in queries (and we don't distinguish here); ' seems kind of
 248  * scary; and urlencode() doesn't touch -_. to begin with.  Plus, although /
 249  * is reserved, we don't care.  So the list we unescape is:
 250  *
 251  * ;:@$!*(),/
 252  *
 253  * However, IIS7 redirects fail when the url contains a colon (Bug 22709),
 254  * so no fancy : for IIS7.
 255  *
 256  * %2F in the page titles seems to fatally break for some reason.
 257  *
 258  * @param $s String:
 259  * @return string
 260 */
 261 function wfUrlencode( $s ) {
 262         static $needle;
 263         if ( is_null( $needle ) ) {
 264                 $needle = array( '%3B','%40','%24','%21','%2A','%28','%29','%2C','%2F' );
 265                 if (! isset($_SERVER['SERVER_SOFTWARE']) || ( strpos($_SERVER['SERVER_SOFTWARE'], "Microsoft-IIS/7") === false)) {
 266                         $needle[] = '%3A';
 267                 }
 268         }
 269
 270         $s = urlencode( $s );
 271         $s = str_ireplace(
 272                 $needle,
 273                 array( ';',  '@',  '$',  '!',  '*',  '(',  ')',  ',',  '/',  ':' ),
 274                 $s
 275         );
 276
 277         return $s;
 278 }
 279
 280 /**
 281  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 282  * In normal operation this is a NOP.
 283  *
 284  * Controlling globals:
 285  * $wgDebugLogFile - points to the log file
 286  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 287  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 288  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 289  *
 290  * @param $text String
 291  * @param $logonly Bool: set true to avoid appearing in HTML when $wgDebugComments is set
 292  */
 293 function wfDebug( $text, $logonly = false ) {
 294         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 295         global $wgDebugLogPrefix, $wgShowDebug;
 296         static $recursion = 0;
 297
 298         static $cache = array(); // Cache of unoutputted messages
 299         $text = wfDebugTimer() . $text;
 300
 301         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 302         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 303                 return;
 304         }
 305
 306         if ( ( $wgDebugComments || $wgShowDebug ) && !$logonly ) {
 307                 $cache[] = $text;
 308
 309                 if ( !isset( $wgOut ) ) {
 310                         return;
 311                 }
 312                 if ( !StubObject::isRealObject( $wgOut ) ) {
 313                         if ( $recursion ) {
 314                                 return;
 315                         }
 316                         $recursion++;
 317                         $wgOut->_unstub();
 318                         $recursion--;
 319                 }
 320
 321                 // add the message and possible cached ones to the output
 322                 array_map( array( $wgOut, 'debug' ), $cache );
 323                 $cache = array();
 324         }
 325         if ( $wgDebugLogFile != '' && !$wgProfileOnly ) {
 326                 # Strip unprintables; they can switch terminal modes when binary data
 327                 # gets dumped, which is pretty annoying.
 328                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 329                 $text = $wgDebugLogPrefix . $text;
 330                 wfErrorLog( $text, $wgDebugLogFile );
 331         }
 332 }
 333
 334 function wfDebugTimer() {
 335         global $wgDebugTimestamps;
 336         if ( !$wgDebugTimestamps ) return '';
 337         static $start = null;
 338
 339         if ( $start === null ) {
 340                 $start = microtime( true );
 341                 $prefix = "\n$start";
 342         } else {
 343                 $prefix = sprintf( "%6.4f", microtime( true ) - $start );
 344         }
 345
 346         return $prefix . '  ';
 347 }
 348
 349 /**
 350  * Send a line giving PHP memory usage.
 351  * @param $exact Bool: print exact values instead of kilobytes (default: false)
 352  */
 353 function wfDebugMem( $exact = false ) {
 354         $mem = memory_get_usage();
 355         if( !$exact ) {
 356                 $mem = floor( $mem / 1024 ) . ' kilobytes';
 357         } else {
 358                 $mem .= ' bytes';
 359         }
 360         wfDebug( "Memory usage: $mem\n" );
 361 }
 362
 363 /**
 364  * Send a line to a supplementary debug log file, if configured, or main debug log if not.
 365  * $wgDebugLogGroups[$logGroup] should be set to a filename to send to a separate log.
 366  *
 367  * @param $logGroup String
 368  * @param $text String
 369  * @param $public Bool: whether to log the event in the public log if no private
 370  *                     log file is specified, (default true)
 371  */
 372 function wfDebugLog( $logGroup, $text, $public = true ) {
 373         global $wgDebugLogGroups, $wgShowHostnames;
 374         $text = trim($text)."\n";
 375         if( isset( $wgDebugLogGroups[$logGroup] ) ) {
 376                 $time = wfTimestamp( TS_DB );
 377                 $wiki = wfWikiID();
 378                 if ( $wgShowHostnames ) {
 379                         $host = wfHostname();
 380                 } else {
 381                         $host = '';
 382                 }
 383                 wfErrorLog( "$time $host $wiki: $text", $wgDebugLogGroups[$logGroup] );
 384         } else if ( $public === true ) {
 385                 wfDebug( $text, true );
 386         }
 387 }
 388
 389 /**
 390  * Log for database errors
 391  * @param $text String: database error message.
 392  */
 393 function wfLogDBError( $text ) {
 394         global $wgDBerrorLog, $wgDBname;
 395         if ( $wgDBerrorLog ) {
 396                 $host = trim(`hostname`);
 397                 $text = date('D M j G:i:s T Y') . "\t$host\t$wgDBname\t$text";
 398                 wfErrorLog( $text, $wgDBerrorLog );
 399         }
 400 }
 401
 402 /**
 403  * Log to a file without getting "file size exceeded" signals.
 404  *
 405  * Can also log to TCP or UDP with the syntax udp://host:port/prefix. This will
 406  * send lines to the specified port, prefixed by the specified prefix and a space.
 407  */
 408 function wfErrorLog( $text, $file ) {
 409         if ( substr( $file, 0, 4 ) == 'udp:' ) {
 410                 if ( preg_match( '!^(tcp|udp):(?://)?\[([0-9a-fA-F:]+)\]:(\d+)(?:/(.*))?$!', $file, $m ) ) {
 411                         // IPv6 bracketed host
 412                         $protocol = $m[1];
 413                         $host = $m[2];
 414                         $port = intval( $m[3] );
 415                         $prefix = isset( $m[4] ) ? $m[4] : false;
 416                         $domain = AF_INET6;
 417                 } elseif ( preg_match( '!^(tcp|udp):(?://)?([a-zA-Z0-9.-]+):(\d+)(?:/(.*))?$!', $file, $m ) ) {
 418                         $protocol = $m[1];
 419                         $host = $m[2];
 420                         if ( !IP::isIPv4( $host ) ) {
 421                                 $host = gethostbyname( $host );
 422                         }
 423                         $port = intval( $m[3] );
 424                         $prefix = isset( $m[4] ) ? $m[4] : false;
 425                         $domain = AF_INET;
 426                 } else {
 427                         throw new MWException( __METHOD__.": Invalid UDP specification" );
 428                 }
 429                 // Clean it up for the multiplexer
 430                 if ( strval( $prefix ) !== '' ) {
 431                         $text = preg_replace( '/^/m', $prefix . ' ', $text );
 432                         if ( substr( $text, -1 ) != "\n" ) {
 433                                 $text .= "\n";
 434                         }
 435                 }
 436
 437                 $sock = socket_create( $domain, SOCK_DGRAM, SOL_UDP );
 438                 if ( !$sock ) {
 439                         return;
 440                 }
 441                 socket_sendto( $sock, $text, strlen( $text ), 0, $host, $port );
 442                 socket_close( $sock );
 443         } else {
 444                 wfSuppressWarnings();
 445                 $exists = file_exists( $file );
 446                 $size = $exists ? filesize( $file ) : false;
 447                 if ( !$exists || ( $size !== false && $size + strlen( $text ) < 0x7fffffff ) ) {
 448                         error_log( $text, 3, $file );
 449                 }
 450                 wfRestoreWarnings();
 451         }
 452 }
 453
 454 /**
 455  * @todo document
 456  */
 457 function wfLogProfilingData() {
 458         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 459         global $wgProfiler, $wgProfileLimit, $wgUser;
 460         # Profiling must actually be enabled...
 461         if( is_null( $wgProfiler ) ) return;
 462         # Get total page request time
 463         $now = wfTime();
 464         $elapsed = $now - $wgRequestTime;
 465         # Only show pages that longer than $wgProfileLimit time (default is 0)
 466         if( $elapsed <= $wgProfileLimit ) return;
 467         $prof = wfGetProfilingOutput( $wgRequestTime, $elapsed );
 468         $forward = '';
 469         if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 470                 $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 471         if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 472                 $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 473         if( !empty( $_SERVER['HTTP_FROM'] ) )
 474                 $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 475         if( $forward )
 476                 $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 477         // Don't unstub $wgUser at this late stage just for statistics purposes
 478         if( StubObject::isRealObject($wgUser) && $wgUser->isAnon() )
 479                 $forward .= ' anon';
 480         $log = sprintf( "%s\t%04.3f\t%s\n",
 481           gmdate( 'YmdHis' ), $elapsed,
 482           urldecode( $wgRequest->getRequestURL() . $forward ) );
 483         if ( $wgDebugLogFile != '' && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 484                 wfErrorLog( $log . $prof, $wgDebugLogFile );
 485         }
 486 }
 487
 488 /**
 489  * Check if the wiki read-only lock file is present. This can be used to lock
 490  * off editing functions, but doesn't guarantee that the database will not be
 491  * modified.
 492  * @return bool
 493  */
 494 function wfReadOnly() {
 495         global $wgReadOnlyFile, $wgReadOnly;
 496
 497         if ( !is_null( $wgReadOnly ) ) {
 498                 return (bool)$wgReadOnly;
 499         }
 500         if ( $wgReadOnlyFile == '' ) {
 501                 return false;
 502         }
 503         // Set $wgReadOnly for faster access next time
 504         if ( is_file( $wgReadOnlyFile ) ) {
 505                 $wgReadOnly = file_get_contents( $wgReadOnlyFile );
 506         } else {
 507                 $wgReadOnly = false;
 508         }
 509         return (bool)$wgReadOnly;
 510 }
 511
 512 function wfReadOnlyReason() {
 513         global $wgReadOnly;
 514         wfReadOnly();
 515         return $wgReadOnly;
 516 }
 517
 518 /**
 519  * Return a Language object from $langcode
 520  * @param $langcode Mixed: either:
 521  *                  - a Language object
 522  *                  - code of the language to get the message for, if it is
 523  *                    a valid code create a language for that language, if
 524  *                    it is a string but not a valid code then make a basic
 525  *                    language object
 526  *                  - a boolean: if it's false then use the current users
 527  *                    language (as a fallback for the old parameter
 528  *                    functionality), or if it is true then use the wikis
 529  * @return Language object
 530  */
 531 function wfGetLangObj( $langcode = false ) {
 532         # Identify which language to get or create a language object for.
 533         # Using is_object here due to Stub objects.
 534         if( is_object( $langcode ) ) {
 535                 # Great, we already have the object (hopefully)!
 536                 return $langcode;
 537         }
 538
 539         global $wgContLang, $wgLanguageCode;
 540         if( $langcode === true || $langcode === $wgLanguageCode ) {
 541                 # $langcode is the language code of the wikis content language object.
 542                 # or it is a boolean and value is true
 543                 return $wgContLang;
 544         }
 545
 546         global $wgLang;
 547         if( $langcode === false || $langcode === $wgLang->getCode() ) {
 548                 # $langcode is the language code of user language object.
 549                 # or it was a boolean and value is false
 550                 return $wgLang;
 551         }
 552
 553         $validCodes = array_keys( Language::getLanguageNames() );
 554         if( in_array( $langcode, $validCodes ) ) {
 555                 # $langcode corresponds to a valid language.
 556                 return Language::factory( $langcode );
 557         }
 558
 559         # $langcode is a string, but not a valid language code; use content language.
 560         wfDebug( "Invalid language code passed to wfGetLangObj, falling back to content language.\n" );
 561         return $wgContLang;
 562 }
 563
 564 function wfUILang() {
 565         global $wgBetterDirectionality;
 566         return wfGetLangObj( $wgBetterDirectionality ? false: true );
 567 }
 568
 569 /**
 570  * Get a message from anywhere, for the current user language.
 571  *
 572  * Use wfMsgForContent() instead if the message should NOT
 573  * change depending on the user preferences.
 574  *
 575  * @param $key String: lookup key for the message, usually
 576  *    defined in languages/Language.php
 577  *
 578  * This function also takes extra optional parameters (not
 579  * shown in the function definition), which can by used to
 580  * insert variable text into the predefined message.
 581  */
 582 function wfMsg( $key ) {
 583         $args = func_get_args();
 584         array_shift( $args );
 585         return wfMsgReal( $key, $args, true );
 586 }
 587
 588 /**
 589  * Same as above except doesn't transform the message
 590  */
 591 function wfMsgNoTrans( $key ) {
 592         $args = func_get_args();
 593         array_shift( $args );
 594         return wfMsgReal( $key, $args, true, false, false );
 595 }
 596
 597 /**
 598  * Get a message from anywhere, for the current global language
 599  * set with $wgLanguageCode.
 600  *
 601  * Use this if the message should NOT change  dependent on the
 602  * language set in the user's preferences. This is the case for
 603  * most text written into logs, as well as link targets (such as
 604  * the name of the copyright policy page). Link titles, on the
 605  * other hand, should be shown in the UI language.
 606  *
 607  * Note that MediaWiki allows users to change the user interface
 608  * language in their preferences, but a single installation
 609  * typically only contains content in one language.
 610  *
 611  * Be wary of this distinction: If you use wfMsg() where you should
 612  * use wfMsgForContent(), a user of the software may have to
 613  * customize potentially hundreds of messages in
 614  * order to, e.g., fix a link in every possible language.
 615  *
 616  * @param $key String: lookup key for the message, usually
 617  *    defined in languages/Language.php
 618  */
 619 function wfMsgForContent( $key ) {
 620         global $wgForceUIMsgAsContentMsg;
 621         $args = func_get_args();
 622         array_shift( $args );
 623         $forcontent = true;
 624         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 625                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 626                 $forcontent = false;
 627         return wfMsgReal( $key, $args, true, $forcontent );
 628 }
 629
 630 /**
 631  * Same as above except doesn't transform the message
 632  */
 633 function wfMsgForContentNoTrans( $key ) {
 634         global $wgForceUIMsgAsContentMsg;
 635         $args = func_get_args();
 636         array_shift( $args );
 637         $forcontent = true;
 638         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 639                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 640                 $forcontent = false;
 641         return wfMsgReal( $key, $args, true, $forcontent, false );
 642 }
 643
 644 /**
 645  * Get a message from the language file, for the UI elements
 646  */
 647 function wfMsgNoDB( $key ) {
 648         $args = func_get_args();
 649         array_shift( $args );
 650         return wfMsgReal( $key, $args, false );
 651 }
 652
 653 /**
 654  * Get a message from the language file, for the content
 655  */
 656 function wfMsgNoDBForContent( $key ) {
 657         global $wgForceUIMsgAsContentMsg;
 658         $args = func_get_args();
 659         array_shift( $args );
 660         $forcontent = true;
 661         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 662                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 663                 $forcontent = false;
 664         return wfMsgReal( $key, $args, false, $forcontent );
 665 }
 666
 667
 668 /**
 669  * Really get a message
 670  * @param $key String: key to get.
 671  * @param $args
 672  * @param $useDB Boolean
 673  * @param $forContent Mixed: Language code, or false for user lang, true for content lang.
 674  * @param $transform Boolean: Whether or not to transform the message.
 675  * @return String: the requested message.
 676  */
 677 function wfMsgReal( $key, $args, $useDB = true, $forContent = false, $transform = true ) {
 678         wfProfileIn( __METHOD__ );
 679         $message = wfMsgGetKey( $key, $useDB, $forContent, $transform );
 680         $message = wfMsgReplaceArgs( $message, $args );
 681         wfProfileOut( __METHOD__ );
 682         return $message;
 683 }
 684
 685 /**
 686  * This function provides the message source for messages to be edited which are *not* stored in the database.
 687  * @param $key String:
 688  */
 689 function wfMsgWeirdKey( $key ) {
 690         $source = wfMsgGetKey( $key, false, true, false );
 691         if ( wfEmptyMsg( $key, $source ) )
 692                 return "";
 693         else
 694                 return $source;
 695 }
 696
 697 /**
 698  * Fetch a message string value, but don't replace any keys yet.
 699  * @param $key String
 700  * @param $useDB Bool
 701  * @param $langCode String: Code of the language to get the message for, or
 702  *                  behaves as a content language switch if it is a boolean.
 703  * @param $transform Boolean: whether to parse magic words, etc.
 704  * @return string
 705  */
 706 function wfMsgGetKey( $key, $useDB, $langCode = false, $transform = true ) {
 707         global $wgContLang, $wgMessageCache;
 708
 709         wfRunHooks('NormalizeMessageKey', array(&$key, &$useDB, &$langCode, &$transform));
 710
 711         if ( !is_object( $wgMessageCache ) ) {
 712                 throw new MWException( "Trying to get message before message cache is initialised" );
 713         }
 714
 715         $message = $wgMessageCache->get( $key, $useDB, $langCode );
 716         if( $message === false ){
 717                 $message = '&lt;' . htmlspecialchars( $key ) . '&gt;';
 718         } elseif ( $transform ) {
 719                 $message = $wgMessageCache->transform( $message );
 720         }
 721         return $message;
 722 }
 723
 724 /**
 725  * Replace message parameter keys on the given formatted output.
 726  *
 727  * @param $message String
 728  * @param $args Array
 729  * @return string
 730  * @private
 731  */
 732 function wfMsgReplaceArgs( $message, $args ) {
 733         # Fix windows line-endings
 734         # Some messages are split with explode("\n", $msg)
 735         $message = str_replace( "\r", '', $message );
 736
 737         // Replace arguments
 738         if ( count( $args ) ) {
 739                 if ( is_array( $args[0] ) ) {
 740                         $args = array_values( $args[0] );
 741                 }
 742                 $replacementKeys = array();
 743                 foreach( $args as $n => $param ) {
 744                         $replacementKeys['$' . ($n + 1)] = $param;
 745                 }
 746                 $message = strtr( $message, $replacementKeys );
 747         }
 748
 749         return $message;
 750 }
 751
 752 /**
 753  * Return an HTML-escaped version of a message.
 754  * Parameter replacements, if any, are done *after* the HTML-escaping,
 755  * so parameters may contain HTML (eg links or form controls). Be sure
 756  * to pre-escape them if you really do want plaintext, or just wrap
 757  * the whole thing in htmlspecialchars().
 758  *
 759  * @param $key String
 760  * @param string ... parameters
 761  * @return string
 762  */
 763 function wfMsgHtml( $key ) {
 764         $args = func_get_args();
 765         array_shift( $args );
 766         return wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $key, true ) ), $args );
 767 }
 768
 769 /**
 770  * Return an HTML version of message
 771  * Parameter replacements, if any, are done *after* parsing the wiki-text message,
 772  * so parameters may contain HTML (eg links or form controls). Be sure
 773  * to pre-escape them if you really do want plaintext, or just wrap
 774  * the whole thing in htmlspecialchars().
 775  *
 776  * @param $key String
 777  * @param string ... parameters
 778  * @return string
 779  */
 780 function wfMsgWikiHtml( $key ) {
 781         global $wgOut;
 782         $args = func_get_args();
 783         array_shift( $args );
 784         return wfMsgReplaceArgs( $wgOut->parse( wfMsgGetKey( $key, true ), /* can't be set to false */ true ), $args );
 785 }
 786
 787 /**
 788  * Returns message in the requested format
 789  * @param $key String: key of the message
 790  * @param $options Array: processing rules. Can take the following options:
 791  *   <i>parse</i>: parses wikitext to html
 792  *   <i>parseinline</i>: parses wikitext to html and removes the surrounding
 793  *       p's added by parser or tidy
 794  *   <i>escape</i>: filters message through htmlspecialchars
 795  *   <i>escapenoentities</i>: same, but allows entity references like &#160; through
 796  *   <i>replaceafter</i>: parameters are substituted after parsing or escaping
 797  *   <i>parsemag</i>: transform the message using magic phrases
 798  *   <i>content</i>: fetch message for content language instead of interface
 799  * Also can accept a single associative argument, of the form 'language' => 'xx':
 800  *   <i>language</i>: Language object or language code to fetch message for
 801  *       (overriden by <i>content</i>), its behaviour with parser, parseinline
 802  *       and parsemag is undefined.
 803  * Behavior for conflicting options (e.g., parse+parseinline) is undefined.
 804  */
 805 function wfMsgExt( $key, $options ) {
 806         global $wgOut;
 807
 808         $args = func_get_args();
 809         array_shift( $args );
 810         array_shift( $args );
 811         $options = (array)$options;
 812
 813         foreach( $options as $arrayKey => $option ) {
 814                 if( !preg_match( '/^[0-9]+|language$/', $arrayKey ) ) {
 815                         # An unknown index, neither numeric nor "language"
 816                         wfWarn( "wfMsgExt called with incorrect parameter key $arrayKey", 1, E_USER_WARNING );
 817                 } elseif( preg_match( '/^[0-9]+$/', $arrayKey ) && !in_array( $option,
 818                 array( 'parse', 'parseinline', 'escape', 'escapenoentities',
 819                 'replaceafter', 'parsemag', 'content' ) ) ) {
 820                         # A numeric index with unknown value
 821                         wfWarn( "wfMsgExt called with incorrect parameter $option", 1, E_USER_WARNING );
 822                 }
 823         }
 824
 825         if( in_array('content', $options, true ) ) {
 826                 $forContent = true;
 827                 $langCode = true;
 828         } elseif( array_key_exists('language', $options) ) {
 829                 $forContent = false;
 830                 $langCode = wfGetLangObj( $options['language'] );
 831         } else {
 832                 $forContent = false;
 833                 $langCode = false;
 834         }
 835
 836         $string = wfMsgGetKey( $key, /*DB*/true, $langCode, /*Transform*/false );
 837
 838         if( !in_array('replaceafter', $options, true ) ) {
 839                 $string = wfMsgReplaceArgs( $string, $args );
 840         }
 841
 842         if( in_array('parse', $options, true ) ) {
 843                 $string = $wgOut->parse( $string, true, !$forContent );
 844         } elseif ( in_array('parseinline', $options, true ) ) {
 845                 $string = $wgOut->parse( $string, true, !$forContent );
 846                 $m = array();
 847                 if( preg_match( '/^<p>(.*)\n?<\/p>\n?$/sU', $string, $m ) ) {
 848                         $string = $m[1];
 849                 }
 850         } elseif ( in_array('parsemag', $options, true ) ) {
 851                 global $wgMessageCache;
 852                 if ( isset( $wgMessageCache ) ) {
 853                         $string = $wgMessageCache->transform( $string,
 854                                 !$forContent,
 855                                 is_object( $langCode ) ? $langCode : null );
 856                 }
 857         }
 858
 859         if ( in_array('escape', $options, true ) ) {
 860                 $string = htmlspecialchars ( $string );
 861         } elseif ( in_array( 'escapenoentities', $options, true  ) ) {
 862                 $string = Sanitizer::escapeHtmlAllowEntities( $string );
 863         }
 864
 865         if( in_array('replaceafter', $options, true ) ) {
 866                 $string = wfMsgReplaceArgs( $string, $args );
 867         }
 868
 869         return $string;
 870 }
 871
 872
 873 /**
 874  * Just like exit() but makes a note of it.
 875  * Commits open transactions except if the error parameter is set
 876  *
 877  * @deprecated Please return control to the caller or throw an exception
 878  */
 879 function wfAbruptExit( $error = false ){
 880         static $called = false;
 881         if ( $called ){
 882                 exit( -1 );
 883         }
 884         $called = true;
 885
 886         $bt = wfDebugBacktrace();
 887         if( $bt ) {
 888                 for($i = 0; $i < count($bt) ; $i++){
 889                         $file = isset($bt[$i]['file']) ? $bt[$i]['file'] : "unknown";
 890                         $line = isset($bt[$i]['line']) ? $bt[$i]['line'] : "unknown";
 891                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 892                 }
 893         } else {
 894                 wfDebug("WARNING: Abrupt exit\n");
 895         }
 896
 897         wfLogProfilingData();
 898
 899         if ( !$error ) {
 900                 wfGetLB()->closeAll();
 901         }
 902         exit( -1 );
 903 }
 904
 905 /**
 906  * @deprecated Please return control the caller or throw an exception
 907  */
 908 function wfErrorExit() {
 909         wfAbruptExit( true );
 910 }
 911
 912 /**
 913  * Print a simple message and die, returning nonzero to the shell if any.
 914  * Plain die() fails to return nonzero to the shell if you pass a string.
 915  * @param $msg String
 916  */
 917 function wfDie( $msg='' ) {
 918         echo $msg;
 919         die( 1 );
 920 }
 921
 922 /**
 923  * Throw a debugging exception. This function previously once exited the process,
 924  * but now throws an exception instead, with similar results.
 925  *
 926  * @param $msg String: message shown when dieing.
 927  */
 928 function wfDebugDieBacktrace( $msg = '' ) {
 929         throw new MWException( $msg );
 930 }
 931
 932 /**
 933  * Fetch server name for use in error reporting etc.
 934  * Use real server name if available, so we know which machine
 935  * in a server farm generated the current page.
 936  * @return string
 937  */
 938 function wfHostname() {
 939         static $host;
 940         if ( is_null( $host ) ) {
 941                 if ( function_exists( 'posix_uname' ) ) {
 942                         // This function not present on Windows
 943                         $uname = @posix_uname();
 944                 } else {
 945                         $uname = false;
 946                 }
 947                 if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 948                         $host = $uname['nodename'];
 949                 } elseif ( getenv( 'COMPUTERNAME' ) ) {
 950                         # Windows computer name
 951                         $host = getenv( 'COMPUTERNAME' );
 952                 } else {
 953                         # This may be a virtual server.
 954                         $host = $_SERVER['SERVER_NAME'];
 955                 }
 956         }
 957         return $host;
 958 }
 959
 960 /**
 961  * Returns a HTML comment with the elapsed time since request.
 962  * This method has no side effects.
 963  * @return string
 964  */
 965 function wfReportTime() {
 966         global $wgRequestTime, $wgShowHostnames;
 967
 968         $now = wfTime();
 969         $elapsed = $now - $wgRequestTime;
 970
 971         return $wgShowHostnames
 972                 ? sprintf( "<!-- Served by %s in %01.3f secs. -->", wfHostname(), $elapsed )
 973                 : sprintf( "<!-- Served in %01.3f secs. -->", $elapsed );
 974 }
 975
 976 /**
 977  * Safety wrapper for debug_backtrace().
 978  *
 979  * With Zend Optimizer 3.2.0 loaded, this causes segfaults under somewhat
 980  * murky circumstances, which may be triggered in part by stub objects
 981  * or other fancy talkin'.
 982  *
 983  * Will return an empty array if Zend Optimizer is detected or if
 984  * debug_backtrace is disabled, otherwise the output from
 985  * debug_backtrace() (trimmed).
 986  *
 987  * @return array of backtrace information
 988  */
 989 function wfDebugBacktrace() {
 990         static $disabled = null;
 991
 992         if( extension_loaded( 'Zend Optimizer' ) ) {
 993                 wfDebug( "Zend Optimizer detected; skipping debug_backtrace for safety.\n" );
 994                 return array();
 995         }
 996
 997         if ( is_null( $disabled ) ) {
 998                 $disabled = false;
 999                 $functions = explode( ',', ini_get( 'disable_functions' ) );
1000                 $functions = array_map( 'trim', $functions );
1001                 $functions = array_map( 'strtolower', $functions );
1002                 if ( in_array( 'debug_backtrace', $functions ) ) {
1003                         wfDebug( "debug_backtrace is in disabled_functions\n" );
1004                         $disabled = true;
1005                 }
1006         }
1007         if ( $disabled ) {
1008                 return array();
1009         }
1010
1011         return array_slice( debug_backtrace(), 1 );
1012 }
1013
1014 function wfBacktrace() {
1015         global $wgCommandLineMode;
1016
1017         if ( $wgCommandLineMode ) {
1018                 $msg = '';
1019         } else {
1020                 $msg = "<ul>\n";
1021         }
1022         $backtrace = wfDebugBacktrace();
1023         foreach( $backtrace as $call ) {
1024                 if( isset( $call['file'] ) ) {
1025                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
1026                         $file = $f[count($f)-1];
1027                 } else {
1028                         $file = '-';
1029                 }
1030                 if( isset( $call['line'] ) ) {
1031                         $line = $call['line'];
1032                 } else {
1033                         $line = '-';
1034                 }
1035                 if ( $wgCommandLineMode ) {
1036                         $msg .= "$file line $line calls ";
1037                 } else {
1038                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
1039                 }
1040                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
1041                 $msg .= $call['function'] . '()';
1042
1043                 if ( $wgCommandLineMode ) {
1044                         $msg .= "\n";
1045                 } else {
1046                         $msg .= "</li>\n";
1047                 }
1048         }
1049         if ( $wgCommandLineMode ) {
1050                 $msg .= "\n";
1051         } else {
1052                 $msg .= "</ul>\n";
1053         }
1054
1055         return $msg;
1056 }
1057
1058
1059 /* Some generic result counters, pulled out of SearchEngine */
1060
1061
1062 /**
1063  * @todo document
1064  */
1065 function wfShowingResults( $offset, $limit ) {
1066         global $wgLang;
1067         return wfMsgExt( 'showingresults', array( 'parseinline' ), $wgLang->formatNum( $limit ),
1068                 $wgLang->formatNum( $offset+1 ) );
1069 }
1070
1071 /**
1072  * @todo document
1073  */
1074 function wfShowingResultsNum( $offset, $limit, $num ) {
1075         global $wgLang;
1076         return wfMsgExt( 'showingresultsnum', array( 'parseinline' ), $wgLang->formatNum( $limit ),
1077                 $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
1078 }
1079
1080 /**
1081  * Generate (prev x| next x) (20|50|100...) type links for paging
1082  * @param $offset String
1083  * @param $limit Integer
1084  * @param $link String
1085  * @param $query String: optional URL query parameter string
1086  * @param $atend Bool: optional param for specified if this is the last page
1087  */
1088 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
1089         global $wgLang;
1090         $fmtLimit = $wgLang->formatNum( $limit );
1091         // FIXME: Why on earth this needs one message for the text and another one for tooltip??
1092         # Get prev/next link display text
1093         $prev =  wfMsgExt( 'prevn', array('parsemag','escape'), $fmtLimit );
1094         $next =  wfMsgExt( 'nextn', array('parsemag','escape'), $fmtLimit );
1095         # Get prev/next link title text
1096         $pTitle = wfMsgExt( 'prevn-title', array('parsemag','escape'), $fmtLimit );
1097         $nTitle = wfMsgExt( 'nextn-title', array('parsemag','escape'), $fmtLimit );
1098         # Fetch the title object
1099         if( is_object( $link ) ) {
1100                 $title =& $link;
1101         } else {
1102                 $title = Title::newFromText( $link );
1103                 if( is_null( $title ) ) {
1104                         return false;
1105                 }
1106         }
1107         # Make 'previous' link
1108         if( 0 != $offset ) {
1109                 $po = $offset - $limit;
1110                 $po = max($po,0);
1111                 $q = "limit={$limit}&offset={$po}";
1112                 if( $query != '' ) {
1113                         $q .= '&'.$query;
1114                 }
1115                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$pTitle}\" class=\"mw-prevlink\">{$prev}</a>";
1116         } else {
1117                 $plink = $prev;
1118         }
1119         # Make 'next' link
1120         $no = $offset + $limit;
1121         $q = "limit={$limit}&offset={$no}";
1122         if( $query != '' ) {
1123                 $q .= '&'.$query;
1124         }
1125         if( $atend ) {
1126                 $nlink = $next;
1127         } else {
1128                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$nTitle}\" class=\"mw-nextlink\">{$next}</a>";
1129         }
1130         # Make links to set number of items per page
1131         $nums = $wgLang->pipeList( array(
1132                 wfNumLink( $offset, 20, $title, $query ),
1133                 wfNumLink( $offset, 50, $title, $query ),
1134                 wfNumLink( $offset, 100, $title, $query ),
1135                 wfNumLink( $offset, 250, $title, $query ),
1136                 wfNumLink( $offset, 500, $title, $query )
1137         ) );
1138         return wfMsgHtml( 'viewprevnext', $plink, $nlink, $nums );
1139 }
1140
1141 /**
1142  * Generate links for (20|50|100...) items-per-page links
1143  * @param $offset String
1144  * @param $limit Integer
1145  * @param $title Title
1146  * @param $query String: optional URL query parameter string
1147  */
1148 function wfNumLink( $offset, $limit, $title, $query = '' ) {
1149         global $wgLang;
1150         if( $query == '' ) {
1151                 $q = '';
1152         } else {
1153                 $q = $query.'&';
1154         }
1155         $q .= "limit={$limit}&offset={$offset}";
1156         $fmtLimit = $wgLang->formatNum( $limit );
1157         $lTitle = wfMsgExt('shown-title',array('parsemag','escape'),$limit);
1158         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$lTitle}\" class=\"mw-numlink\">{$fmtLimit}</a>";
1159         return $s;
1160 }
1161
1162 /**
1163  * @todo document
1164  * @todo FIXME: we may want to blacklist some broken browsers
1165  *
1166  * @return bool Whereas client accept gzip compression
1167  */
1168 function wfClientAcceptsGzip() {
1169         if( isset( $_SERVER['HTTP_ACCEPT_ENCODING'] ) ) {
1170                 # FIXME: we may want to blacklist some broken browsers
1171                 $m = array();
1172                 if( preg_match(
1173                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
1174                         $_SERVER['HTTP_ACCEPT_ENCODING'],
1175                         $m ) ) {
1176                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
1177                         wfDebug( " accepts gzip\n" );
1178                         return true;
1179                 }
1180         }
1181         return false;
1182 }
1183
1184 /**
1185  * Obtain the offset and limit values from the request string;
1186  * used in special pages
1187  *
1188  * @param $deflimit Default limit if none supplied
1189  * @param $optionname Name of a user preference to check against
1190  * @return array
1191  *
1192  */
1193 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
1194         global $wgRequest;
1195         return $wgRequest->getLimitOffset( $deflimit, $optionname );
1196 }
1197
1198 /**
1199  * Escapes the given text so that it may be output using addWikiText()
1200  * without any linking, formatting, etc. making its way through. This
1201  * is achieved by substituting certain characters with HTML entities.
1202  * As required by the callers, <nowiki> is not used. It currently does
1203  * not filter out characters which have special meaning only at the
1204  * start of a line, such as "*".
1205  *
1206  * @param $text String: text to be escaped
1207  */
1208 function wfEscapeWikiText( $text ) {
1209         $text = str_replace(
1210                 array( '[',     '|',      ']',     '\'',    'ISBN ',     'RFC ',     '://',     "\n=",     '{{' ), # }}
1211                 array( '&#91;', '&#124;', '&#93;', '&#39;', 'ISBN&#32;', 'RFC&#32;', '&#58;//', "\n&#61;", '&#123;&#123;' ),
1212                 htmlspecialchars($text) );
1213         return $text;
1214 }
1215
1216 /**
1217  * @todo document
1218  */
1219 function wfQuotedPrintable( $string, $charset = '' ) {
1220         # Probably incomplete; see RFC 2045
1221         if( empty( $charset ) ) {
1222                 global $wgInputEncoding;
1223                 $charset = $wgInputEncoding;
1224         }
1225         $charset = strtoupper( $charset );
1226         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
1227
1228         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
1229         $replace = $illegal . '\t ?_';
1230         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
1231         $out = "=?$charset?Q?";
1232         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
1233         $out .= '?=';
1234         return $out;
1235 }
1236
1237
1238 /**
1239  * @todo document
1240  * @return float
1241  */
1242 function wfTime() {
1243         return microtime(true);
1244 }
1245
1246 /**
1247  * Sets dest to source and returns the original value of dest
1248  * If source is NULL, it just returns the value, it doesn't set the variable
1249  */
1250 function wfSetVar( &$dest, $source ) {
1251         $temp = $dest;
1252         if ( !is_null( $source ) ) {
1253                 $dest = $source;
1254         }
1255         return $temp;
1256 }
1257
1258 /**
1259  * As for wfSetVar except setting a bit
1260  */
1261 function wfSetBit( &$dest, $bit, $state = true ) {
1262         $temp = (bool)($dest & $bit );
1263         if ( !is_null( $state ) ) {
1264                 if ( $state ) {
1265                         $dest |= $bit;
1266                 } else {
1267                         $dest &= ~$bit;
1268                 }
1269         }
1270         return $temp;
1271 }
1272
1273 /**
1274  * This function takes two arrays as input, and returns a CGI-style string, e.g.
1275  * "days=7&limit=100". Options in the first array override options in the second.
1276  * Options set to "" will not be output.
1277  */
1278 function wfArrayToCGI( $array1, $array2 = null )
1279 {
1280         if ( !is_null( $array2 ) ) {
1281                 $array1 = $array1 + $array2;
1282         }
1283
1284         $cgi = '';
1285         foreach ( $array1 as $key => $value ) {
1286                 if ( $value !== '' ) {
1287                         if ( $cgi != '' ) {
1288                                 $cgi .= '&';
1289                         }
1290                         if ( is_array( $value ) ) {
1291                                 $firstTime = true;
1292                                 foreach ( $value as $v ) {
1293                                         $cgi .= ( $firstTime ? '' : '&') .
1294                                                 urlencode( $key . '[]' ) . '=' .
1295                                                 urlencode( $v );
1296                                         $firstTime = false;
1297                                 }
1298                         } else {
1299                                 if ( is_object( $value ) ) {
1300                                         $value = $value->__toString();
1301                                 }
1302                                 $cgi .= urlencode( $key ) . '=' .
1303                                         urlencode( $value );
1304                         }
1305                 }
1306         }
1307         return $cgi;
1308 }
1309
1310 /**
1311  * This is the logical opposite of wfArrayToCGI(): it accepts a query string as
1312  * its argument and returns the same string in array form.  This allows compa-
1313  * tibility with legacy functions that accept raw query strings instead of nice
1314  * arrays.  Of course, keys and values are urldecode()d.  Don't try passing in-
1315  * valid query strings, or it will explode.
1316  *
1317  * @param $query String: query string
1318  * @return array Array version of input
1319  */
1320 function wfCgiToArray( $query ) {
1321         if( isset( $query[0] ) and $query[0] == '?' ) {
1322                 $query = substr( $query, 1 );
1323         }
1324         $bits = explode( '&', $query );
1325         $ret = array();
1326         foreach( $bits as $bit ) {
1327                 if( $bit === '' ) {
1328                         continue;
1329                 }
1330                 list( $key, $value ) = explode( '=', $bit );
1331                 $key = urldecode( $key );
1332                 $value = urldecode( $value );
1333                 $ret[$key] = $value;
1334         }
1335         return $ret;
1336 }
1337
1338 /**
1339  * Append a query string to an existing URL, which may or may not already
1340  * have query string parameters already. If so, they will be combined.
1341  *
1342  * @param $url String
1343  * @param $query Mixed: string or associative array
1344  * @return string
1345  */
1346 function wfAppendQuery( $url, $query ) {
1347         if ( is_array( $query ) ) {
1348                 $query = wfArrayToCGI( $query );
1349         }
1350         if( $query != '' ) {
1351                 if( false === strpos( $url, '?' ) ) {
1352                         $url .= '?';
1353                 } else {
1354                         $url .= '&';
1355                 }
1356                 $url .= $query;
1357         }
1358         return $url;
1359 }
1360
1361 /**
1362  * Expand a potentially local URL to a fully-qualified URL.  Assumes $wgServer
1363  * and $wgProto are correct.
1364  *
1365  * @todo this won't work with current-path-relative URLs
1366  * like "subdir/foo.html", etc.
1367  *
1368  * @param $url String: either fully-qualified or a local path + query
1369  * @return string Fully-qualified URL
1370  */
1371 function wfExpandUrl( $url ) {
1372         if( substr( $url, 0, 2 ) == '//' ) {
1373                 global $wgProto;
1374                 return $wgProto . ':' . $url;
1375         } elseif( substr( $url, 0, 1 ) == '/' ) {
1376                 global $wgServer;
1377                 return $wgServer . $url;
1378         } else {
1379                 return $url;
1380         }
1381 }
1382
1383 /**
1384  * This is obsolete, use SquidUpdate::purge()
1385  * @deprecated
1386  */
1387 function wfPurgeSquidServers ($urlArr) {
1388         SquidUpdate::purge( $urlArr );
1389 }
1390
1391 /**
1392  * Windows-compatible version of escapeshellarg()
1393  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
1394  * function puts single quotes in regardless of OS.
1395  *
1396  * Also fixes the locale problems on Linux in PHP 5.2.6+ (bug backported to
1397  * earlier distro releases of PHP)
1398  */
1399 function wfEscapeShellArg( ) {
1400         wfInitShellLocale();
1401
1402         $args = func_get_args();
1403         $first = true;
1404         $retVal = '';
1405         foreach ( $args as $arg ) {
1406                 if ( !$first ) {
1407                         $retVal .= ' ';
1408                 } else {
1409                         $first = false;
1410                 }
1411
1412                 if ( wfIsWindows() ) {
1413                         // Escaping for an MSVC-style command line parser
1414                         // Ref: http://mailman.lyra.org/pipermail/scite-interest/2002-March/000436.html
1415                         // Double the backslashes before any double quotes. Escape the double quotes.
1416                         $tokens = preg_split( '/(\\\\*")/', $arg, -1, PREG_SPLIT_DELIM_CAPTURE );
1417                         $arg = '';
1418                         $delim = false;
1419                         foreach ( $tokens as $token ) {
1420                                 if ( $delim ) {
1421                                         $arg .= str_replace( '\\', '\\\\', substr( $token, 0, -1 ) ) . '\\"';
1422                                 } else {
1423                                         $arg .= $token;
1424                                 }
1425                                 $delim = !$delim;
1426                         }
1427
1428                         // Double the backslashes before the end of the string, because
1429                         // we will soon add a quote
1430                         $m = array();
1431                         if ( preg_match( '/^(.*?)(\\\\+)$/', $arg, $m ) ) {
1432                                 $arg = $m[1] . str_replace( '\\', '\\\\', $m[2] );
1433                         }
1434
1435                         // The caret is also an special character
1436                         $arg = str_replace( "^", "^^", $arg );
1437
1438                         // Add surrounding quotes
1439                         $retVal .= '"' . $arg . '"';
1440                 } else {
1441                         $retVal .= escapeshellarg( $arg );
1442                 }
1443         }
1444         return $retVal;
1445 }
1446
1447 /**
1448  * wfMerge attempts to merge differences between three texts.
1449  * Returns true for a clean merge and false for failure or a conflict.
1450  */
1451 function wfMerge( $old, $mine, $yours, &$result ){
1452         global $wgDiff3;
1453
1454         # This check may also protect against code injection in
1455         # case of broken installations.
1456         if( !$wgDiff3 || !file_exists( $wgDiff3 ) ) {
1457                 wfDebug( "diff3 not found\n" );
1458                 return false;
1459         }
1460
1461         # Make temporary files
1462         $td = wfTempDir();
1463         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1464         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
1465         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
1466
1467         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
1468         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
1469         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
1470
1471         # Check for a conflict
1472         $cmd = $wgDiff3 . ' -a --overlap-only ' .
1473           wfEscapeShellArg( $mytextName ) . ' ' .
1474           wfEscapeShellArg( $oldtextName ) . ' ' .
1475           wfEscapeShellArg( $yourtextName );
1476         $handle = popen( $cmd, 'r' );
1477
1478         if( fgets( $handle, 1024 ) ){
1479                 $conflict = true;
1480         } else {
1481                 $conflict = false;
1482         }
1483         pclose( $handle );
1484
1485         # Merge differences
1486         $cmd = $wgDiff3 . ' -a -e --merge ' .
1487           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
1488         $handle = popen( $cmd, 'r' );
1489         $result = '';
1490         do {
1491                 $data = fread( $handle, 8192 );
1492                 if ( strlen( $data ) == 0 ) {
1493                         break;
1494                 }
1495                 $result .= $data;
1496         } while ( true );
1497         pclose( $handle );
1498         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
1499
1500         if ( $result === '' && $old !== '' && !$conflict ) {
1501                 wfDebug( "Unexpected null result from diff3. Command: $cmd\n" );
1502                 $conflict = true;
1503         }
1504         return ! $conflict;
1505 }
1506
1507 /**
1508  * Returns unified plain-text diff of two texts.
1509  * Useful for machine processing of diffs.
1510  * @param $before String: the text before the changes.
1511  * @param $after String: the text after the changes.
1512  * @param $params String: command-line options for the diff command.
1513  * @return String: unified diff of $before and $after
1514  */
1515 function wfDiff( $before, $after, $params = '-u' ) {
1516         if ($before == $after) {
1517                 return '';
1518         }
1519
1520         global $wgDiff;
1521
1522         # This check may also protect against code injection in
1523         # case of broken installations.
1524         if( !file_exists( $wgDiff ) ){
1525                 wfDebug( "diff executable not found\n" );
1526                 $diffs = new Diff( explode( "\n", $before ), explode( "\n", $after ) );
1527                 $format = new UnifiedDiffFormatter();
1528                 return $format->format( $diffs );
1529         }
1530
1531         # Make temporary files
1532         $td = wfTempDir();
1533         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1534         $newtextFile = fopen( $newtextName = tempnam( $td, 'merge-your-' ), 'w' );
1535
1536         fwrite( $oldtextFile, $before ); fclose( $oldtextFile );
1537         fwrite( $newtextFile, $after ); fclose( $newtextFile );
1538
1539         // Get the diff of the two files
1540         $cmd = "$wgDiff " . $params . ' ' .wfEscapeShellArg( $oldtextName, $newtextName );
1541
1542         $h = popen( $cmd, 'r' );
1543
1544         $diff = '';
1545
1546         do {
1547                 $data = fread( $h, 8192 );
1548                 if ( strlen( $data ) == 0 ) {
1549                         break;
1550                 }
1551                 $diff .= $data;
1552         } while ( true );
1553
1554         // Clean up
1555         pclose( $h );
1556         unlink( $oldtextName );
1557         unlink( $newtextName );
1558
1559         // Kill the --- and +++ lines. They're not useful.
1560         $diff_lines = explode( "\n", $diff );
1561         if (strpos( $diff_lines[0], '---' ) === 0) {
1562                 unset($diff_lines[0]);
1563         }
1564         if (strpos( $diff_lines[1], '+++' ) === 0) {
1565                 unset($diff_lines[1]);
1566         }
1567
1568         $diff = implode( "\n", $diff_lines );
1569
1570         return $diff;
1571 }
1572
1573 /**
1574  * A wrapper around the PHP function var_export().
1575  * Either print it or add it to the regular output ($wgOut).
1576  *
1577  * @param $var A PHP variable to dump.
1578  */
1579 function wfVarDump( $var ) {
1580         global $wgOut;
1581         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
1582         if ( headers_sent() || !@is_object( $wgOut ) ) {
1583                 print $s;
1584         } else {
1585                 $wgOut->addHTML( $s );
1586         }
1587 }
1588
1589 /**
1590  * Provide a simple HTTP error.
1591  */
1592 function wfHttpError( $code, $label, $desc ) {
1593         global $wgOut;
1594         $wgOut->disable();
1595         header( "HTTP/1.0 $code $label" );
1596         header( "Status: $code $label" );
1597         $wgOut->sendCacheControl();
1598
1599         header( 'Content-type: text/html; charset=utf-8' );
1600         print "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">".
1601                 "<html><head><title>" .
1602                 htmlspecialchars( $label ) .
1603                 "</title></head><body><h1>" .
1604                 htmlspecialchars( $label ) .
1605                 "</h1><p>" .
1606                 nl2br( htmlspecialchars( $desc ) ) .
1607                 "</p></body></html>\n";
1608 }
1609
1610 /**
1611  * Clear away any user-level output buffers, discarding contents.
1612  *
1613  * Suitable for 'starting afresh', for instance when streaming
1614  * relatively large amounts of data without buffering, or wanting to
1615  * output image files without ob_gzhandler's compression.
1616  *
1617  * The optional $resetGzipEncoding parameter controls suppression of
1618  * the Content-Encoding header sent by ob_gzhandler; by default it
1619  * is left. See comments for wfClearOutputBuffers() for why it would
1620  * be used.
1621  *
1622  * Note that some PHP configuration options may add output buffer
1623  * layers which cannot be removed; these are left in place.
1624  *
1625  * @param $resetGzipEncoding Bool
1626  */
1627 function wfResetOutputBuffers( $resetGzipEncoding=true ) {
1628         if( $resetGzipEncoding ) {
1629                 // Suppress Content-Encoding and Content-Length
1630                 // headers from 1.10+s wfOutputHandler
1631                 global $wgDisableOutputCompression;
1632                 $wgDisableOutputCompression = true;
1633         }
1634         while( $status = ob_get_status() ) {
1635                 if( $status['type'] == 0 /* PHP_OUTPUT_HANDLER_INTERNAL */ ) {
1636                         // Probably from zlib.output_compression or other
1637                         // PHP-internal setting which can't be removed.
1638                         //
1639                         // Give up, and hope the result doesn't break
1640                         // output behavior.
1641                         break;
1642                 }
1643                 if( !ob_end_clean() ) {
1644                         // Could not remove output buffer handler; abort now
1645                         // to avoid getting in some kind of infinite loop.
1646                         break;
1647                 }
1648                 if( $resetGzipEncoding ) {
1649                         if( $status['name'] == 'ob_gzhandler' ) {
1650                                 // Reset the 'Content-Encoding' field set by this handler
1651                                 // so we can start fresh.
1652                                 header( 'Content-Encoding:' );
1653                                 break;
1654                         }
1655                 }
1656         }
1657 }
1658
1659 /**
1660  * More legible than passing a 'false' parameter to wfResetOutputBuffers():
1661  *
1662  * Clear away output buffers, but keep the Content-Encoding header
1663  * produced by ob_gzhandler, if any.
1664  *
1665  * This should be used for HTTP 304 responses, where you need to
1666  * preserve the Content-Encoding header of the real result, but
1667  * also need to suppress the output of ob_gzhandler to keep to spec
1668  * and avoid breaking Firefox in rare cases where the headers and
1669  * body are broken over two packets.
1670  */
1671 function wfClearOutputBuffers() {
1672         wfResetOutputBuffers( false );
1673 }
1674
1675 /**
1676  * Converts an Accept-* header into an array mapping string values to quality
1677  * factors
1678  */
1679 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
1680         # No arg means accept anything (per HTTP spec)
1681         if( !$accept ) {
1682                 return array( $def => 1.0 );
1683         }
1684
1685         $prefs = array();
1686
1687         $parts = explode( ',', $accept );
1688
1689         foreach( $parts as $part ) {
1690                 # FIXME: doesn't deal with params like 'text/html; level=1'
1691                 @list( $value, $qpart ) = explode( ';', trim( $part ) );
1692                 $match = array();
1693                 if( !isset( $qpart ) ) {
1694                         $prefs[$value] = 1.0;
1695                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
1696                         $prefs[$value] = floatval($match[1]);
1697                 }
1698         }
1699
1700         return $prefs;
1701 }
1702
1703 /**
1704  * Checks if a given MIME type matches any of the keys in the given
1705  * array. Basic wildcards are accepted in the array keys.
1706  *
1707  * Returns the matching MIME type (or wildcard) if a match, otherwise
1708  * NULL if no match.
1709  *
1710  * @param $type String
1711  * @param $avail Array
1712  * @return string
1713  * @private
1714  */
1715 function mimeTypeMatch( $type, $avail ) {
1716         if( array_key_exists($type, $avail) ) {
1717                 return $type;
1718         } else {
1719                 $parts = explode( '/', $type );
1720                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
1721                         return $parts[0] . '/*';
1722                 } elseif( array_key_exists( '*/*', $avail ) ) {
1723                         return '*/*';
1724                 } else {
1725                         return null;
1726                 }
1727         }
1728 }
1729
1730 /**
1731  * Returns the 'best' match between a client's requested internet media types
1732  * and the server's list of available types. Each list should be an associative
1733  * array of type to preference (preference is a float between 0.0 and 1.0).
1734  * Wildcards in the types are acceptable.
1735  *
1736  * @param $cprefs Array: client's acceptable type list
1737  * @param $sprefs Array: server's offered types
1738  * @return string
1739  *
1740  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
1741  * XXX: generalize to negotiate other stuff
1742  */
1743 function wfNegotiateType( $cprefs, $sprefs ) {
1744         $combine = array();
1745
1746         foreach( array_keys($sprefs) as $type ) {
1747                 $parts = explode( '/', $type );
1748                 if( $parts[1] != '*' ) {
1749                         $ckey = mimeTypeMatch( $type, $cprefs );
1750                         if( $ckey ) {
1751                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1752                         }
1753                 }
1754         }
1755
1756         foreach( array_keys( $cprefs ) as $type ) {
1757                 $parts = explode( '/', $type );
1758                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
1759                         $skey = mimeTypeMatch( $type, $sprefs );
1760                         if( $skey ) {
1761                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1762                         }
1763                 }
1764         }
1765
1766         $bestq = 0;
1767         $besttype = null;
1768
1769         foreach( array_keys( $combine ) as $type ) {
1770                 if( $combine[$type] > $bestq ) {
1771                         $besttype = $type;
1772                         $bestq = $combine[$type];
1773                 }
1774         }
1775
1776         return $besttype;
1777 }
1778
1779 /**
1780  * Array lookup
1781  * Returns an array where the values in the first array are replaced by the
1782  * values in the second array with the corresponding keys
1783  *
1784  * @return array
1785  */
1786 function wfArrayLookup( $a, $b ) {
1787         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
1788 }
1789
1790 /**
1791  * Convenience function; returns MediaWiki timestamp for the present time.
1792  * @return string
1793  */
1794 function wfTimestampNow() {
1795         # return NOW
1796         return wfTimestamp( TS_MW, time() );
1797 }
1798
1799 /**
1800  * Reference-counted warning suppression
1801  */
1802 function wfSuppressWarnings( $end = false ) {
1803         static $suppressCount = 0;
1804         static $originalLevel = false;
1805
1806         if ( $end ) {
1807                 if ( $suppressCount ) {
1808                         --$suppressCount;
1809                         if ( !$suppressCount ) {
1810                                 error_reporting( $originalLevel );
1811                         }
1812                 }
1813         } else {
1814                 if ( !$suppressCount ) {
1815                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE | E_USER_WARNING | E_USER_NOTICE ) );
1816                 }
1817                 ++$suppressCount;
1818         }
1819 }
1820
1821 /**
1822  * Restore error level to previous value
1823  */
1824 function wfRestoreWarnings() {
1825         wfSuppressWarnings( true );
1826 }
1827
1828 # Autodetect, convert and provide timestamps of various types
1829
1830 /**
1831  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1832  */
1833 define('TS_UNIX', 0);
1834
1835 /**
1836  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1837  */
1838 define('TS_MW', 1);
1839
1840 /**
1841  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1842  */
1843 define('TS_DB', 2);
1844
1845 /**
1846  * RFC 2822 format, for E-mail and HTTP headers
1847  */
1848 define('TS_RFC2822', 3);
1849
1850 /**
1851  * ISO 8601 format with no timezone: 1986-02-09T20:00:00Z
1852  *
1853  * This is used by Special:Export
1854  */
1855 define('TS_ISO_8601', 4);
1856
1857 /**
1858  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1859  *
1860  * @see http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1861  *       DateTime tag and page 36 for the DateTimeOriginal and
1862  *       DateTimeDigitized tags.
1863  */
1864 define('TS_EXIF', 5);
1865
1866 /**
1867  * Oracle format time.
1868  */
1869 define('TS_ORACLE', 6);
1870
1871 /**
1872  * Postgres format time.
1873  */
1874 define('TS_POSTGRES', 7);
1875
1876 /**
1877  * DB2 format time
1878  */
1879 define('TS_DB2', 8);
1880
1881 /**
1882  * @param $outputtype Mixed: A timestamp in one of the supported formats, the
1883  *                    function will autodetect which format is supplied and act
1884  *                    accordingly.
1885  * @param $ts Mixed: the timestamp to convert or 0 for the current timestamp
1886  * @return String: in the format specified in $outputtype
1887  */
1888 function wfTimestamp( $outputtype = TS_UNIX, $ts = 0 ) {
1889         $uts = 0;
1890         $da = array();
1891         if ($ts==0) {
1892                 $uts=time();
1893         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1894                 # TS_DB
1895         } elseif (preg_match('/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1896                 # TS_EXIF
1897         } elseif (preg_match('/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D',$ts,$da)) {
1898                 # TS_MW
1899         } elseif (preg_match('/^\d{1,13}$/D',$ts)) {
1900                 # TS_UNIX
1901                 $uts = $ts;
1902         } elseif (preg_match('/^\d{2}-\d{2}-\d{4} \d{2}:\d{2}:\d{2}.\d{6}$/', $ts)) {
1903                 # TS_ORACLE // session altered to DD-MM-YYYY HH24:MI:SS.FF6
1904                 $uts = strtotime(preg_replace('/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
1905                                 str_replace("+00:00", "UTC", $ts)));
1906         } elseif (preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.*\d*)?Z$/', $ts, $da)) {
1907                 # TS_ISO_8601
1908         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d*[\+\- ](\d\d)$/',$ts,$da)) {
1909                 # TS_POSTGRES
1910         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d* GMT$/',$ts,$da)) {
1911                 # TS_POSTGRES
1912         } else {
1913                 # Bogus value; fall back to the epoch...
1914                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1915                 $uts = 0;
1916         }
1917
1918         if (count( $da ) ) {
1919                 // Warning! gmmktime() acts oddly if the month or day is set to 0
1920                 // We may want to handle that explicitly at some point
1921                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1922                         (int)$da[2],(int)$da[3],(int)$da[1]);
1923         }
1924
1925         switch($outputtype) {
1926                 case TS_UNIX:
1927                         return $uts;
1928                 case TS_MW:
1929                         return gmdate( 'YmdHis', $uts );
1930                 case TS_DB:
1931                         return gmdate( 'Y-m-d H:i:s', $uts );
1932                 case TS_ISO_8601:
1933                         return gmdate( 'Y-m-d\TH:i:s\Z', $uts );
1934                 // This shouldn't ever be used, but is included for completeness
1935                 case TS_EXIF:
1936                         return gmdate(  'Y:m:d H:i:s', $uts );
1937                 case TS_RFC2822:
1938                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1939                 case TS_ORACLE:
1940                         return gmdate( 'd-m-Y H:i:s.000000', $uts);
1941                         //return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
1942                 case TS_POSTGRES:
1943                         return gmdate( 'Y-m-d H:i:s', $uts) . ' GMT';
1944                 case TS_DB2:
1945                         return gmdate( 'Y-m-d H:i:s', $uts);
1946                 default:
1947                         throw new MWException( 'wfTimestamp() called with illegal output type.');
1948         }
1949 }
1950
1951 /**
1952  * Return a formatted timestamp, or null if input is null.
1953  * For dealing with nullable timestamp columns in the database.
1954  * @param $outputtype Integer
1955  * @param $ts String
1956  * @return String
1957  */
1958 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1959         if( is_null( $ts ) ) {
1960                 return null;
1961         } else {
1962                 return wfTimestamp( $outputtype, $ts );
1963         }
1964 }
1965
1966 /**
1967  * Check if the operating system is Windows
1968  *
1969  * @return Bool: true if it's Windows, False otherwise.
1970  */
1971 function wfIsWindows() {
1972         if (substr(php_uname(), 0, 7) == 'Windows') {
1973                 return true;
1974         } else {
1975                 return false;
1976         }
1977 }
1978
1979 /**
1980  * Swap two variables
1981  */
1982 function swap( &$x, &$y ) {
1983         $z = $x;
1984         $x = $y;
1985         $y = $z;
1986 }
1987
1988 function wfGetCachedNotice( $name ) {
1989         global $wgOut, $wgRenderHashAppend, $parserMemc;
1990         $fname = 'wfGetCachedNotice';
1991         wfProfileIn( $fname );
1992
1993         $needParse = false;
1994
1995         if( $name === 'default' ) {
1996                 // special case
1997                 global $wgSiteNotice;
1998                 $notice = $wgSiteNotice;
1999                 if( empty( $notice ) ) {
2000                         wfProfileOut( $fname );
2001                         return false;
2002                 }
2003         } else {
2004                 $notice = wfMsgForContentNoTrans( $name );
2005                 if( wfEmptyMsg( $name, $notice ) || $notice == '-' ) {
2006                         wfProfileOut( $fname );
2007                         return( false );
2008                 }
2009         }
2010
2011         // Use the extra hash appender to let eg SSL variants separately cache.
2012         $key = wfMemcKey( $name . $wgRenderHashAppend );
2013         $cachedNotice = $parserMemc->get( $key );
2014         if( is_array( $cachedNotice ) ) {
2015                 if( md5( $notice ) == $cachedNotice['hash'] ) {
2016                         $notice = $cachedNotice['html'];
2017                 } else {
2018                         $needParse = true;
2019                 }
2020         } else {
2021                 $needParse = true;
2022         }
2023
2024         if( $needParse ) {
2025                 if( is_object( $wgOut ) ) {
2026                         $parsed = $wgOut->parse( $notice );
2027                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
2028                         $notice = $parsed;
2029                 } else {
2030                         wfDebug( 'wfGetCachedNotice called for ' . $name . ' with no $wgOut available'."\n" );
2031                         $notice = '';
2032                 }
2033         }
2034         $notice = '<div id="localNotice">'.$notice.'</div>';
2035         wfProfileOut( $fname );
2036         return $notice;
2037 }
2038
2039 function wfGetNamespaceNotice() {
2040         global $wgTitle;
2041
2042         # Paranoia
2043         if ( !isset( $wgTitle ) || !is_object( $wgTitle ) )
2044                 return "";
2045
2046         $fname = 'wfGetNamespaceNotice';
2047         wfProfileIn( $fname );
2048
2049         $key = "namespacenotice-" . $wgTitle->getNsText();
2050         $namespaceNotice = wfGetCachedNotice( $key );
2051         if ( $namespaceNotice && substr ( $namespaceNotice , 0 ,7 ) != "<p>&lt;" ) {
2052                  $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . "</div>";
2053         } else {
2054                 $namespaceNotice = "";
2055         }
2056
2057         wfProfileOut( $fname );
2058         return $namespaceNotice;
2059 }
2060
2061 function wfGetSiteNotice() {
2062         global $wgUser, $wgSiteNotice;
2063         $fname = 'wfGetSiteNotice';
2064         wfProfileIn( $fname );
2065         $siteNotice = '';
2066
2067         if( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice ) ) ) {
2068                 if( is_object( $wgUser ) && $wgUser->isLoggedIn() ) {
2069                         $siteNotice = wfGetCachedNotice( 'sitenotice' );
2070                 } else {
2071                         $anonNotice = wfGetCachedNotice( 'anonnotice' );
2072                         if( !$anonNotice ) {
2073                                 $siteNotice = wfGetCachedNotice( 'sitenotice' );
2074                         } else {
2075                                 $siteNotice = $anonNotice;
2076                         }
2077                 }
2078                 if( !$siteNotice ) {
2079                         $siteNotice = wfGetCachedNotice( 'default' );
2080                 }
2081         }
2082
2083         wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice ) );
2084         wfProfileOut( $fname );
2085         return $siteNotice;
2086 }
2087
2088 /**
2089  * BC wrapper for MimeMagic::singleton()
2090  * @deprecated
2091  */
2092 function &wfGetMimeMagic() {
2093         wfDeprecated( __FUNCTION__ );
2094         return MimeMagic::singleton();
2095 }
2096
2097 /**
2098  * Tries to get the system directory for temporary files. For PHP >= 5.2.1,
2099  * we'll use sys_get_temp_dir(). The TMPDIR, TMP, and TEMP environment
2100  * variables are then checked in sequence, and if none are set /tmp is
2101  * returned as the generic Unix default.
2102  *
2103  * NOTE: When possible, use the tempfile() function to create temporary
2104  * files to avoid race conditions on file creation, etc.
2105  *
2106  * @return String
2107  */
2108 function wfTempDir() {
2109         if( function_exists( 'sys_get_temp_dir' ) ) {
2110                 return sys_get_temp_dir();
2111         }
2112         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
2113                 $tmp = getenv( $var );
2114                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
2115                         return $tmp;
2116                 }
2117         }
2118         # Hope this is Unix of some kind!
2119         return '/tmp';
2120 }
2121
2122 /**
2123  * Make directory, and make all parent directories if they don't exist
2124  *
2125  * @param $dir String: full path to directory to create
2126  * @param $mode Integer: chmod value to use, default is $wgDirectoryMode
2127  * @param $caller String: optional caller param for debugging.
2128  * @return bool
2129  */
2130 function wfMkdirParents( $dir, $mode = null, $caller = null ) {
2131         global $wgDirectoryMode;
2132
2133         if ( !is_null( $caller ) ) {
2134                 wfDebug( "$caller: called wfMkdirParents($dir)" );
2135         }
2136
2137         if( strval( $dir ) === '' || file_exists( $dir ) )
2138                 return true;
2139
2140         $dir = str_replace( array( '\\', '/' ), DIRECTORY_SEPARATOR, $dir );
2141
2142         if ( is_null( $mode ) )
2143                 $mode = $wgDirectoryMode;
2144
2145         // Turn off the normal warning, we're doing our own below
2146         wfSuppressWarnings();
2147         $ok = mkdir( $dir, $mode, true );  // PHP5 <3
2148         wfRestoreWarnings();
2149
2150         if( !$ok ) {
2151                 // PHP doesn't report the path in its warning message, so add our own to aid in diagnosis.
2152                 trigger_error( __FUNCTION__ . ": failed to mkdir \"$dir\" mode $mode", E_USER_WARNING );
2153         }
2154         return $ok;
2155 }
2156
2157 /**
2158  * Increment a statistics counter
2159  */
2160 function wfIncrStats( $key ) {
2161         global $wgStatsMethod;
2162
2163         if( $wgStatsMethod == 'udp' ) {
2164                 global $wgUDPProfilerHost, $wgUDPProfilerPort, $wgDBname;
2165                 static $socket;
2166                 if (!$socket) {
2167                         $socket=socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
2168                         $statline="stats/{$wgDBname} - 1 1 1 1 1 -total\n";
2169                         socket_sendto($socket,$statline,strlen($statline),0,$wgUDPProfilerHost,$wgUDPProfilerPort);
2170                 }
2171                 $statline="stats/{$wgDBname} - 1 1 1 1 1 {$key}\n";
2172                 @socket_sendto($socket,$statline,strlen($statline),0,$wgUDPProfilerHost,$wgUDPProfilerPort);
2173         } elseif( $wgStatsMethod == 'cache' ) {
2174                 global $wgMemc;
2175                 $key = wfMemcKey( 'stats', $key );
2176                 if ( is_null( $wgMemc->incr( $key ) ) ) {
2177                         $wgMemc->add( $key, 1 );
2178                 }
2179         } else {
2180                 // Disabled
2181         }
2182 }
2183
2184 /**
2185  * @param $nr Mixed: the number to format
2186  * @param $acc Integer: the number of digits after the decimal point, default 2
2187  * @param $round Boolean: whether or not to round the value, default true
2188  * @return float
2189  */
2190 function wfPercent( $nr, $acc = 2, $round = true ) {
2191         $ret = sprintf( "%.${acc}f", $nr );
2192         return $round ? round( $ret, $acc ) . '%' : "$ret%";
2193 }
2194
2195 /**
2196  * Encrypt a username/password.
2197  *
2198  * @param $userid Integer: ID of the user
2199  * @param $password String: password of the user
2200  * @return String: hashed password
2201  * @deprecated Use User::crypt() or User::oldCrypt() instead
2202  */
2203 function wfEncryptPassword( $userid, $password ) {
2204         wfDeprecated(__FUNCTION__);
2205         # Just wrap around User::oldCrypt()
2206         return User::oldCrypt($password, $userid);
2207 }
2208
2209 /**
2210  * Appends to second array if $value differs from that in $default
2211  */
2212 function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
2213         if ( is_null( $changed ) ) {
2214                 throw new MWException('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
2215         }
2216         if ( $default[$key] !== $value ) {
2217                 $changed[$key] = $value;
2218         }
2219 }
2220
2221 /**
2222  * Since wfMsg() and co suck, they don't return false if the message key they
2223  * looked up didn't exist but a XHTML string, this function checks for the
2224  * nonexistance of messages by looking at wfMsg() output
2225  *
2226  * @param $key      String: the message key looked up
2227  * @return Boolean True if the message *doesn't* exist.
2228  */
2229 function wfEmptyMsg( $key ) {
2230         global $wgMessageCache;
2231         return $wgMessageCache->get( $key, /*useDB*/true, /*content*/false ) === false;
2232 }
2233
2234 /**
2235  * Find out whether or not a mixed variable exists in a string
2236  *
2237  * @param $needle String
2238  * @param $str String
2239  * @return Boolean
2240  */
2241 function in_string( $needle, $str ) {
2242         return strpos( $str, $needle ) !== false;
2243 }
2244
2245 function wfSpecialList( $page, $details ) {
2246         global $wgContLang;
2247         $details = $details ? ' ' . $wgContLang->getDirMark() . "($details)" : "";
2248         return $page . $details;
2249 }
2250
2251 /**
2252  * Returns a regular expression of url protocols
2253  *
2254  * @return String
2255  */
2256 function wfUrlProtocols() {
2257         global $wgUrlProtocols;
2258
2259         static $retval = null;
2260         if ( !is_null( $retval ) )
2261                 return $retval;
2262
2263         // Support old-style $wgUrlProtocols strings, for backwards compatibility
2264         // with LocalSettings files from 1.5
2265         if ( is_array( $wgUrlProtocols ) ) {
2266                 $protocols = array();
2267                 foreach ($wgUrlProtocols as $protocol)
2268                         $protocols[] = preg_quote( $protocol, '/' );
2269
2270                 $retval = implode( '|', $protocols );
2271         } else {
2272                 $retval = $wgUrlProtocols;
2273         }
2274         return $retval;
2275 }
2276
2277 /**
2278  * Safety wrapper around ini_get() for boolean settings.
2279  * The values returned from ini_get() are pre-normalized for settings
2280  * set via php.ini or php_flag/php_admin_flag... but *not*
2281  * for those set via php_value/php_admin_value.
2282  *
2283  * It's fairly common for people to use php_value instead of php_flag,
2284  * which can leave you with an 'off' setting giving a false positive
2285  * for code that just takes the ini_get() return value as a boolean.
2286  *
2287  * To make things extra interesting, setting via php_value accepts
2288  * "true" and "yes" as true, but php.ini and php_flag consider them false. :)
2289  * Unrecognized values go false... again opposite PHP's own coercion
2290  * from string to bool.
2291  *
2292  * Luckily, 'properly' set settings will always come back as '0' or '1',
2293  * so we only have to worry about them and the 'improper' settings.
2294  *
2295  * I frickin' hate PHP... :P
2296  *
2297  * @param $setting String
2298  * @return Bool
2299  */
2300 function wfIniGetBool( $setting ) {
2301         $val = ini_get( $setting );
2302         // 'on' and 'true' can't have whitespace around them, but '1' can.
2303         return strtolower( $val ) == 'on'
2304                 || strtolower( $val ) == 'true'
2305                 || strtolower( $val ) == 'yes'
2306                 || preg_match( "/^\s*[+-]?0*[1-9]/", $val ); // approx C atoi() function
2307 }
2308
2309 /**
2310  * Wrapper function for PHP's dl(). This doesn't work in most situations from
2311  * PHP 5.3 onward, and is usually disabled in shared environments anyway.
2312  *
2313  * @param $extension String A PHP extension. The file suffix (.so or .dll)
2314  *                          should be omitted
2315  * @return Bool - Whether or not the extension is loaded
2316  */
2317 function wfDl( $extension ) {
2318         if( extension_loaded( $extension ) ) {
2319                 return true;
2320         }
2321
2322         $canDl = ( function_exists( 'dl' ) && is_callable( 'dl' )
2323                 && wfIniGetBool( 'enable_dl' ) && !wfIniGetBool( 'safe_mode' ) );
2324
2325         if( $canDl ) {
2326                 wfSuppressWarnings();
2327                 dl( $extension . '.' . PHP_SHLIB_SUFFIX );
2328                 wfRestoreWarnings();
2329         }
2330         return extension_loaded( $extension );
2331 }
2332
2333 /**
2334  * Execute a shell command, with time and memory limits mirrored from the PHP
2335  * configuration if supported.
2336  * @param $cmd Command line, properly escaped for shell.
2337  * @param &$retval optional, will receive the program's exit code.
2338  *                 (non-zero is usually failure)
2339  * @return collected stdout as a string (trailing newlines stripped)
2340  */
2341 function wfShellExec( $cmd, &$retval=null ) {
2342         global $IP, $wgMaxShellMemory, $wgMaxShellFileSize, $wgMaxShellTime;
2343
2344         static $disabled;
2345         if ( is_null( $disabled ) ) {
2346                 $disabled = false;
2347                 if( wfIniGetBool( 'safe_mode' ) ) {
2348                         wfDebug( "wfShellExec can't run in safe_mode, PHP's exec functions are too broken.\n" );
2349                         $disabled = true;
2350                 }
2351                 $functions = explode( ',', ini_get( 'disable_functions' ) );
2352                 $functions = array_map( 'trim', $functions );
2353                 $functions = array_map( 'strtolower', $functions );
2354                 if ( in_array( 'passthru', $functions ) ) {
2355                         wfDebug( "passthru is in disabled_functions\n" );
2356                         $disabled = true;
2357                 }
2358         }
2359         if ( $disabled ) {
2360                 $retval = 1;
2361                 return "Unable to run external programs in safe mode.";
2362         }
2363
2364         wfInitShellLocale();
2365
2366         if ( php_uname( 's' ) == 'Linux' ) {
2367                 $time = intval( $wgMaxShellTime );
2368                 $mem = intval( $wgMaxShellMemory );
2369                 $filesize = intval( $wgMaxShellFileSize );
2370
2371                 if ( $time > 0 && $mem > 0 ) {
2372                         $script = "$IP/bin/ulimit4.sh";
2373                         if ( is_executable( $script ) ) {
2374                                 $cmd = escapeshellarg( $script ) . " $time $mem $filesize " . escapeshellarg( $cmd );
2375                         }
2376                 }
2377         } elseif ( php_uname( 's' ) == 'Windows NT' &&
2378                 version_compare( PHP_VERSION, '5.3.0', '<' ) )
2379         {
2380                 # This is a hack to work around PHP's flawed invocation of cmd.exe
2381                 # http://news.php.net/php.internals/21796
2382                 # Which is fixed in 5.3.0 :)
2383                 $cmd = '"' . $cmd . '"';
2384         }
2385         wfDebug( "wfShellExec: $cmd\n" );
2386
2387         $retval = 1; // error by default?
2388         ob_start();
2389         passthru( $cmd, $retval );
2390         $output = ob_get_contents();
2391         ob_end_clean();
2392
2393         if ( $retval == 127 ) {
2394                 wfDebugLog( 'exec', "Possibly missing executable file: $cmd\n" );
2395         }
2396         return $output;
2397 }
2398
2399 /**
2400  * Workaround for http://bugs.php.net/bug.php?id=45132
2401  * escapeshellarg() destroys non-ASCII characters if LANG is not a UTF-8 locale
2402  */
2403 function wfInitShellLocale() {
2404         static $done = false;
2405         if ( $done ) return;
2406         $done = true;
2407         global $wgShellLocale;
2408         if ( !wfIniGetBool( 'safe_mode' ) ) {
2409                 putenv( "LC_CTYPE=$wgShellLocale" );
2410                 setlocale( LC_CTYPE, $wgShellLocale );
2411         }
2412 }
2413
2414 /**
2415  * This function works like "use VERSION" in Perl, the program will die with a
2416  * backtrace if the current version of PHP is less than the version provided
2417  *
2418  * This is useful for extensions which due to their nature are not kept in sync
2419  * with releases, and might depend on other versions of PHP than the main code
2420  *
2421  * Note: PHP might die due to parsing errors in some cases before it ever
2422  *       manages to call this function, such is life
2423  *
2424  * @see perldoc -f use
2425  *
2426  * @param $req_ver Mixed: the version to check, can be a string, an integer, or
2427  *                 a float
2428  */
2429 function wfUsePHP( $req_ver ) {
2430         $php_ver = PHP_VERSION;
2431
2432         if ( version_compare( $php_ver, (string)$req_ver, '<' ) )
2433                  throw new MWException( "PHP $req_ver required--this is only $php_ver" );
2434 }
2435
2436 /**
2437  * This function works like "use VERSION" in Perl except it checks the version
2438  * of MediaWiki, the program will die with a backtrace if the current version
2439  * of MediaWiki is less than the version provided.
2440  *
2441  * This is useful for extensions which due to their nature are not kept in sync
2442  * with releases
2443  *
2444  * @see perldoc -f use
2445  *
2446  * @param $req_ver Mixed: the version to check, can be a string, an integer, or
2447  *                 a float
2448  */
2449 function wfUseMW( $req_ver ) {
2450         global $wgVersion;
2451
2452         if ( version_compare( $wgVersion, (string)$req_ver, '<' ) )
2453                 throw new MWException( "MediaWiki $req_ver required--this is only $wgVersion" );
2454 }
2455
2456 /**
2457  * Return the final portion of a pathname.
2458  * Reimplemented because PHP5's basename() is buggy with multibyte text.
2459  * http://bugs.php.net/bug.php?id=33898
2460  *
2461  * PHP's basename() only considers '\' a pathchar on Windows and Netware.
2462  * We'll consider it so always, as we don't want \s in our Unix paths either.
2463  *
2464  * @param $path String
2465  * @param $suffix String: to remove if present
2466  * @return String
2467  */
2468 function wfBaseName( $path, $suffix='' ) {
2469         $encSuffix = ($suffix == '')
2470                 ? ''
2471                 : ( '(?:' . preg_quote( $suffix, '#' ) . ')?' );
2472         $matches = array();
2473         if( preg_match( "#([^/\\\\]*?){$encSuffix}[/\\\\]*$#", $path, $matches ) ) {
2474                 return $matches[1];
2475         } else {
2476                 return '';
2477         }
2478 }
2479
2480 /**
2481  * Generate a relative path name to the given file.
2482  * May explode on non-matching case-insensitive paths,
2483  * funky symlinks, etc.
2484  *
2485  * @param $path String: absolute destination path including target filename
2486  * @param $from String: Absolute source path, directory only
2487  * @return String
2488  */
2489 function wfRelativePath( $path, $from ) {
2490         // Normalize mixed input on Windows...
2491         $path = str_replace( '/', DIRECTORY_SEPARATOR, $path );
2492         $from = str_replace( '/', DIRECTORY_SEPARATOR, $from );
2493
2494         // Trim trailing slashes -- fix for drive root
2495         $path = rtrim( $path, DIRECTORY_SEPARATOR );
2496         $from = rtrim( $from, DIRECTORY_SEPARATOR );
2497
2498         $pieces  = explode( DIRECTORY_SEPARATOR, dirname( $path ) );
2499         $against = explode( DIRECTORY_SEPARATOR, $from );
2500
2501         if( $pieces[0] !== $against[0] ) {
2502                 // Non-matching Windows drive letters?
2503                 // Return a full path.
2504                 return $path;
2505         }
2506
2507         // Trim off common prefix
2508         while( count( $pieces ) && count( $against )
2509                 && $pieces[0] == $against[0] ) {
2510                 array_shift( $pieces );
2511                 array_shift( $against );
2512         }
2513
2514         // relative dots to bump us to the parent
2515         while( count( $against ) ) {
2516                 array_unshift( $pieces, '..' );
2517                 array_shift( $against );
2518         }
2519
2520         array_push( $pieces, wfBaseName( $path ) );
2521
2522         return implode( DIRECTORY_SEPARATOR, $pieces );
2523 }
2524
2525 /**
2526  * Backwards array plus for people who haven't bothered to read the PHP manual
2527  * XXX: will not darn your socks for you.
2528  *
2529  * @param $array1 Array
2530  * @param [$array2, [...]] Arrays
2531  * @return Array
2532  */
2533 function wfArrayMerge( $array1/* ... */ ) {
2534         $args = func_get_args();
2535         $args = array_reverse( $args, true );
2536         $out = array();
2537         foreach ( $args as $arg ) {
2538                 $out += $arg;
2539         }
2540         return $out;
2541 }
2542
2543 /**
2544  * Merge arrays in the style of getUserPermissionsErrors, with duplicate removal
2545  * e.g.
2546  *      wfMergeErrorArrays(
2547  *              array( array( 'x' ) ),
2548  *              array( array( 'x', '2' ) ),
2549  *              array( array( 'x' ) ),
2550  *              array( array( 'y') )
2551  *      );
2552  * returns:
2553  *              array(
2554  *              array( 'x', '2' ),
2555  *              array( 'x' ),
2556  *              array( 'y' )
2557  *      )
2558  */
2559 function wfMergeErrorArrays( /*...*/ ) {
2560         $args = func_get_args();
2561         $out = array();
2562         foreach ( $args as $errors ) {
2563                 foreach ( $errors as $params ) {
2564                         # FIXME: sometimes get nested arrays for $params,
2565                         # which leads to E_NOTICEs
2566                         $spec = implode( "\t", $params );
2567                         $out[$spec] = $params;
2568                 }
2569         }
2570         return array_values( $out );
2571 }
2572
2573 /**
2574  * parse_url() work-alike, but non-broken.  Differences:
2575  *
2576  * 1) Does not raise warnings on bad URLs (just returns false)
2577  * 2) Handles protocols that don't use :// (e.g., mailto: and news:) correctly
2578  * 3) Adds a "delimiter" element to the array, either '://' or ':' (see (2))
2579  *
2580  * @param $url String: a URL to parse
2581  * @return Array: bits of the URL in an associative array, per PHP docs
2582  */
2583 function wfParseUrl( $url ) {
2584         global $wgUrlProtocols; // Allow all protocols defined in DefaultSettings/LocalSettings.php
2585         wfSuppressWarnings();
2586         $bits = parse_url( $url );
2587         wfRestoreWarnings();
2588         if ( !$bits ) {
2589                 return false;
2590         }
2591
2592         // most of the protocols are followed by ://, but mailto: and sometimes news: not, check for it
2593         if ( in_array( $bits['scheme'] . '://', $wgUrlProtocols ) ) {
2594                 $bits['delimiter'] = '://';
2595         } elseif ( in_array( $bits['scheme'] . ':', $wgUrlProtocols ) ) {
2596                 $bits['delimiter'] = ':';
2597                 // parse_url detects for news: and mailto: the host part of an url as path
2598                 // We have to correct this wrong detection
2599                 if ( isset ( $bits['path'] ) ) {
2600                         $bits['host'] = $bits['path'];
2601                         $bits['path'] = '';
2602                 }
2603         } else {
2604                 return false;
2605         }
2606
2607         return $bits;
2608 }
2609
2610 /**
2611  * Make a URL index, appropriate for the el_index field of externallinks.
2612  */
2613 function wfMakeUrlIndex( $url ) {
2614         $bits = wfParseUrl( $url );
2615
2616         // Reverse the labels in the hostname, convert to lower case
2617         // For emails reverse domainpart only
2618         if ( $bits['scheme'] == 'mailto' ) {
2619                 $mailparts = explode( '@', $bits['host'], 2 );
2620                 if ( count($mailparts) === 2 ) {
2621                         $domainpart = strtolower( implode( '.', array_reverse( explode( '.', $mailparts[1] ) ) ) );
2622                 } else {
2623                         // No domain specified, don't mangle it
2624                         $domainpart = '';
2625                 }
2626                 $reversedHost = $domainpart . '@' . $mailparts[0];
2627         } else {
2628                 $reversedHost = strtolower( implode( '.', array_reverse( explode( '.', $bits['host'] ) ) ) );
2629         }
2630         // Add an extra dot to the end
2631         // Why? Is it in wrong place in mailto links?
2632         if ( substr( $reversedHost, -1, 1 ) !== '.' ) {
2633                 $reversedHost .= '.';
2634         }
2635         // Reconstruct the pseudo-URL
2636         $prot = $bits['scheme'];
2637         $index = $prot . $bits['delimiter'] . $reversedHost;
2638         // Leave out user and password. Add the port, path, query and fragment
2639         if ( isset( $bits['port'] ) )      $index .= ':' . $bits['port'];
2640         if ( isset( $bits['path'] ) ) {
2641                 $index .= $bits['path'];
2642         } else {
2643                 $index .= '/';
2644         }
2645         if ( isset( $bits['query'] ) )     $index .= '?' . $bits['query'];
2646         if ( isset( $bits['fragment'] ) )  $index .= '#' . $bits['fragment'];
2647         return $index;
2648 }
2649
2650 /**
2651  * Do any deferred updates and clear the list
2652  * TODO: This could be in Wiki.php if that class made any sense at all
2653  */
2654 function wfDoUpdates()
2655 {
2656         global $wgPostCommitUpdateList, $wgDeferredUpdateList;
2657         foreach ( $wgDeferredUpdateList as $update ) {
2658                 $update->doUpdate();
2659         }
2660         foreach ( $wgPostCommitUpdateList as $update ) {
2661                 $update->doUpdate();
2662         }
2663         $wgDeferredUpdateList = array();
2664         $wgPostCommitUpdateList = array();
2665 }
2666
2667 /**
2668  * Convert an arbitrarily-long digit string from one numeric base
2669  * to another, optionally zero-padding to a minimum column width.
2670  *
2671  * Supports base 2 through 36; digit values 10-36 are represented
2672  * as lowercase letters a-z. Input is case-insensitive.
2673  *
2674  * @param $input String: of digits
2675  * @param $sourceBase Integer: 2-36
2676  * @param $destBase Integer: 2-36
2677  * @param $pad Integer: 1 or greater
2678  * @param $lowercase Boolean
2679  * @return String or false on invalid input
2680  */
2681 function wfBaseConvert( $input, $sourceBase, $destBase, $pad=1, $lowercase=true ) {
2682         $input = strval( $input );
2683         if( $sourceBase < 2 ||
2684                 $sourceBase > 36 ||
2685                 $destBase < 2 ||
2686                 $destBase > 36 ||
2687                 $pad < 1 ||
2688                 $sourceBase != intval( $sourceBase ) ||
2689                 $destBase != intval( $destBase ) ||
2690                 $pad != intval( $pad ) ||
2691                 !is_string( $input ) ||
2692                 $input == '' ) {
2693                 return false;
2694         }
2695         $digitChars = ( $lowercase ) ?  '0123456789abcdefghijklmnopqrstuvwxyz' : '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
2696         $inDigits = array();
2697         $outChars = '';
2698
2699         // Decode and validate input string
2700         $input = strtolower( $input );
2701         for( $i = 0; $i < strlen( $input ); $i++ ) {
2702                 $n = strpos( $digitChars, $input{$i} );
2703                 if( $n === false || $n > $sourceBase ) {
2704                         return false;
2705                 }
2706                 $inDigits[] = $n;
2707         }
2708
2709         // Iterate over the input, modulo-ing out an output digit
2710         // at a time until input is gone.
2711         while( count( $inDigits ) ) {
2712                 $work = 0;
2713                 $workDigits = array();
2714
2715                 // Long division...
2716                 foreach( $inDigits as $digit ) {
2717                         $work *= $sourceBase;
2718                         $work += $digit;
2719
2720                         if( $work < $destBase ) {
2721                                 // Gonna need to pull another digit.
2722                                 if( count( $workDigits ) ) {
2723                                         // Avoid zero-padding; this lets us find
2724                                         // the end of the input very easily when
2725                                         // length drops to zero.
2726                                         $workDigits[] = 0;
2727                                 }
2728                         } else {
2729                                 // Finally! Actual division!
2730                                 $workDigits[] = intval( $work / $destBase );
2731
2732                                 // Isn't it annoying that most programming languages
2733                                 // don't have a single divide-and-remainder operator,
2734                                 // even though the CPU implements it that way?
2735                                 $work = $work % $destBase;
2736                         }
2737                 }
2738
2739                 // All that division leaves us with a remainder,
2740                 // which is conveniently our next output digit.
2741                 $outChars .= $digitChars[$work];
2742
2743                 // And we continue!
2744                 $inDigits = $workDigits;
2745         }
2746
2747         while( strlen( $outChars ) < $pad ) {
2748                 $outChars .= '0';
2749         }
2750
2751         return strrev( $outChars );
2752 }
2753
2754 /**
2755  * Create an object with a given name and an array of construct parameters
2756  * @param $name String
2757  * @param $p Array: parameters
2758  */
2759 function wfCreateObject( $name, $p ){
2760         $p = array_values( $p );
2761         switch ( count( $p ) ) {
2762                 case 0:
2763                         return new $name;
2764                 case 1:
2765                         return new $name( $p[0] );
2766                 case 2:
2767                         return new $name( $p[0], $p[1] );
2768                 case 3:
2769                         return new $name( $p[0], $p[1], $p[2] );
2770                 case 4:
2771                         return new $name( $p[0], $p[1], $p[2], $p[3] );
2772                 case 5:
2773                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4] );
2774                 case 6:
2775                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4], $p[5] );
2776                 default:
2777                         throw new MWException( "Too many arguments to construtor in wfCreateObject" );
2778         }
2779 }
2780
2781 function wfHttpOnlySafe() {
2782         global $wgHttpOnlyBlacklist;
2783         if( !version_compare("5.2", PHP_VERSION, "<") )
2784                 return false;
2785
2786         if( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
2787                 foreach( $wgHttpOnlyBlacklist as $regex ) {
2788                         if( preg_match( $regex, $_SERVER['HTTP_USER_AGENT'] ) ) {
2789                                 return false;
2790                         }
2791                 }
2792         }
2793
2794         return true;
2795 }
2796
2797 /**
2798  * Initialise php session
2799  */
2800 function wfSetupSession() {
2801         global $wgSessionsInMemcached, $wgCookiePath, $wgCookieDomain,
2802                         $wgCookieSecure, $wgCookieHttpOnly, $wgSessionHandler;
2803         if( $wgSessionsInMemcached ) {
2804                 require_once( 'MemcachedSessions.php' );
2805         } elseif( $wgSessionHandler && $wgSessionHandler != ini_get( 'session.save_handler' ) ) {
2806                 # Only set this if $wgSessionHandler isn't null and session.save_handler
2807                 # hasn't already been set to the desired value (that causes errors)
2808                 ini_set ( 'session.save_handler', $wgSessionHandler );
2809         }
2810         $httpOnlySafe = wfHttpOnlySafe();
2811         wfDebugLog( 'cookie',
2812                 'session_set_cookie_params: "' . implode( '", "',
2813                         array(
2814                                 0,
2815                                 $wgCookiePath,
2816                                 $wgCookieDomain,
2817                                 $wgCookieSecure,
2818                                 $httpOnlySafe && $wgCookieHttpOnly ) ) . '"' );
2819         if( $httpOnlySafe && $wgCookieHttpOnly ) {
2820                 session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure, $wgCookieHttpOnly );
2821         } else {
2822                 // PHP 5.1 throws warnings if you pass the HttpOnly parameter for 5.2.
2823                 session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );
2824         }
2825         session_cache_limiter( 'private, must-revalidate' );
2826         wfSuppressWarnings();
2827         session_start();
2828         wfRestoreWarnings();
2829 }
2830
2831 /**
2832  * Get an object from the precompiled serialized directory
2833  *
2834  * @return Mixed: the variable on success, false on failure
2835  */
2836 function wfGetPrecompiledData( $name ) {
2837         global $IP;
2838
2839         $file = "$IP/serialized/$name";
2840         if ( file_exists( $file ) ) {
2841                 $blob = file_get_contents( $file );
2842                 if ( $blob ) {
2843                         return unserialize( $blob );
2844                 }
2845         }
2846         return false;
2847 }
2848
2849 function wfGetCaller( $level = 2 ) {
2850         $backtrace = wfDebugBacktrace();
2851         if ( isset( $backtrace[$level] ) ) {
2852                 return wfFormatStackFrame($backtrace[$level]);
2853         } else {
2854                 $caller = 'unknown';
2855         }
2856         return $caller;
2857 }
2858
2859 /**
2860  * Return a string consisting of callers in the stack. Useful sometimes
2861  * for profiling specific points.
2862  *
2863  * @param $limit The maximum depth of the stack frame to return, or false for
2864  *               the entire stack.
2865  */
2866 function wfGetAllCallers( $limit = 3 ) {
2867         $trace = array_reverse( wfDebugBacktrace() );
2868         if ( !$limit || $limit > count( $trace ) - 1 ) {
2869                 $limit = count( $trace ) - 1;
2870         }
2871         $trace = array_slice( $trace, -$limit - 1, $limit );
2872         return implode( '/', array_map( 'wfFormatStackFrame', $trace ) );
2873 }
2874
2875 /**
2876  * Return a string representation of frame
2877  */
2878 function wfFormatStackFrame($frame) {
2879         return isset( $frame["class"] )?
2880                 $frame["class"]."::".$frame["function"]:
2881                 $frame["function"];
2882 }
2883
2884 /**
2885  * Get a cache key
2886  */
2887 function wfMemcKey( /*... */ ) {
2888         $args = func_get_args();
2889         $key = wfWikiID() . ':' . implode( ':', $args );
2890         $key = str_replace( ' ', '_', $key );
2891         return $key;
2892 }
2893
2894 /**
2895  * Get a cache key for a foreign DB
2896  */
2897 function wfForeignMemcKey( $db, $prefix /*, ... */ ) {
2898         $args = array_slice( func_get_args(), 2 );
2899         if ( $prefix ) {
2900                 $key = "$db-$prefix:" . implode( ':', $args );
2901         } else {
2902                 $key = $db . ':' . implode( ':', $args );
2903         }
2904         return $key;
2905 }
2906
2907 /**
2908  * Get an ASCII string identifying this wiki
2909  * This is used as a prefix in memcached keys
2910  */
2911 function wfWikiID() {
2912         global $wgDBprefix, $wgDBname;
2913         if ( $wgDBprefix ) {
2914                 return "$wgDBname-$wgDBprefix";
2915         } else {
2916                 return $wgDBname;
2917         }
2918 }
2919
2920 /**
2921  * Split a wiki ID into DB name and table prefix
2922  */
2923 function wfSplitWikiID( $wiki ) {
2924         $bits = explode( '-', $wiki, 2 );
2925         if ( count( $bits ) < 2 ) {
2926                 $bits[] = '';
2927         }
2928         return $bits;
2929 }
2930
2931 /*
2932  * Get a Database object.
2933  * @param $db Integer: index of the connection to get. May be DB_MASTER for the
2934  *            master (for write queries), DB_SLAVE for potentially lagged read
2935  *            queries, or an integer >= 0 for a particular server.
2936  *
2937  * @param $groups Mixed: query groups. An array of group names that this query
2938  *                belongs to. May contain a single string if the query is only
2939  *                in one group.
2940  *
2941  * @param $wiki String: the wiki ID, or false for the current wiki
2942  *
2943  * Note: multiple calls to wfGetDB(DB_SLAVE) during the course of one request
2944  * will always return the same object, unless the underlying connection or load
2945  * balancer is manually destroyed.
2946  */
2947 function &wfGetDB( $db, $groups = array(), $wiki = false ) {
2948         return wfGetLB( $wiki )->getConnection( $db, $groups, $wiki );
2949 }
2950
2951 /**
2952  * Get a load balancer object.
2953  *
2954  * @param $wiki String: wiki ID, or false for the current wiki
2955  * @return LoadBalancer
2956  */
2957 function wfGetLB( $wiki = false ) {
2958         return wfGetLBFactory()->getMainLB( $wiki );
2959 }
2960
2961 /**
2962  * Get the load balancer factory object
2963  */
2964 function &wfGetLBFactory() {
2965         return LBFactory::singleton();
2966 }
2967
2968 /**
2969  * Find a file.
2970  * Shortcut for RepoGroup::singleton()->findFile()
2971  * @param $title Either a string or Title object
2972  * @param $options Associative array of options:
2973  *     time:           requested time for an archived image, or false for the
2974  *                     current version. An image object will be returned which was
2975  *                     created at the specified time.
2976  *
2977  *     ignoreRedirect: If true, do not follow file redirects
2978  *
2979  *     private:        If true, return restricted (deleted) files if the current
2980  *                     user is allowed to view them. Otherwise, such files will not
2981  *                     be found.
2982  *
2983  *     bypassCache:    If true, do not use the process-local cache of File objects
2984  *
2985  * @return File, or false if the file does not exist
2986  */
2987 function wfFindFile( $title, $options = array() ) {
2988         return RepoGroup::singleton()->findFile( $title, $options );
2989 }
2990
2991 /**
2992  * Get an object referring to a locally registered file.
2993  * Returns a valid placeholder object if the file does not exist.
2994  * @param $title Either a string or Title object
2995  * @return File, or null if passed an invalid Title
2996  */
2997 function wfLocalFile( $title ) {
2998         return RepoGroup::singleton()->getLocalRepo()->newFile( $title );
2999 }
3000
3001 /**
3002  * Should low-performance queries be disabled?
3003  *
3004  * @return Boolean
3005  */
3006 function wfQueriesMustScale() {
3007         global $wgMiserMode;
3008         return $wgMiserMode
3009                 || ( SiteStats::pages() > 100000
3010                 && SiteStats::edits() > 1000000
3011                 && SiteStats::users() > 10000 );
3012 }
3013
3014 /**
3015  * Get the path to a specified script file, respecting file
3016  * extensions; this is a wrapper around $wgScriptExtension etc.
3017  *
3018  * @param $script String: script filename, sans extension
3019  * @return String
3020  */
3021 function wfScript( $script = 'index' ) {
3022         global $wgScriptPath, $wgScriptExtension;
3023         return "{$wgScriptPath}/{$script}{$wgScriptExtension}";
3024 }
3025 /**
3026  * Get the script url.
3027  *
3028  * @return script url
3029  */
3030 function wfGetScriptUrl(){
3031         if( isset( $_SERVER['SCRIPT_NAME'] ) ) {
3032                 #
3033                 # as it was called, minus the query string.
3034                 #
3035                 # Some sites use Apache rewrite rules to handle subdomains,
3036                 # and have PHP set up in a weird way that causes PHP_SELF
3037                 # to contain the rewritten URL instead of the one that the
3038                 # outside world sees.
3039                 #
3040                 # If in this mode, use SCRIPT_URL instead, which mod_rewrite
3041                 # provides containing the "before" URL.
3042                 return $_SERVER['SCRIPT_NAME'];
3043         } else {
3044                 return $_SERVER['URL'];
3045         }
3046 }
3047
3048 /**
3049  * Convenience function converts boolean values into "true"
3050  * or "false" (string) values
3051  *
3052  * @param $value Boolean
3053  * @return String
3054  */
3055 function wfBoolToStr( $value ) {
3056         return $value ? 'true' : 'false';
3057 }
3058
3059 /**
3060  * Load an extension messages file
3061  * @deprecated in 1.16 (warnings in 1.18, removed in ?)
3062  */
3063 function wfLoadExtensionMessages( $extensionName, $langcode = false ) {
3064 }
3065
3066 /**
3067  * Get a platform-independent path to the null file, e.g.
3068  * /dev/null
3069  *
3070  * @return string
3071  */
3072 function wfGetNull() {
3073         return wfIsWindows()
3074                 ? 'NUL'
3075                 : '/dev/null';
3076 }
3077
3078 /**
3079  * Displays a maxlag error
3080  *
3081  * @param $host String: server that lags the most
3082  * @param $lag Integer: maxlag (actual)
3083  * @param $maxLag Integer: maxlag (requested)
3084  */
3085 function wfMaxlagError( $host, $lag, $maxLag ) {
3086         global $wgShowHostnames;
3087         header( 'HTTP/1.1 503 Service Unavailable' );
3088         header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
3089         header( 'X-Database-Lag: ' . intval( $lag ) );
3090         header( 'Content-Type: text/plain' );
3091         if( $wgShowHostnames ) {
3092                 echo "Waiting for $host: $lag seconds lagged\n";
3093         } else {
3094                 echo "Waiting for a database server: $lag seconds lagged\n";
3095         }
3096 }
3097
3098 /**
3099  * Throws a warning that $function is deprecated
3100  * @param $function String
3101  * @return null
3102  */
3103 function wfDeprecated( $function ) {
3104         static $functionsWarned = array();
3105         if ( !isset( $functionsWarned[$function] ) ) {
3106                 $functionsWarned[$function] = true;
3107                 wfWarn( "Use of $function is deprecated.", 2 );
3108         }
3109 }
3110
3111 /**
3112  * Send a warning either to the debug log or in a PHP error depending on
3113  * $wgDevelopmentWarnings
3114  *
3115  * @param $msg String: message to send
3116  * @param $callerOffset Integer: number of itmes to go back in the backtrace to
3117  *        find the correct caller (1 = function calling wfWarn, ...)
3118  * @param $level Integer: PHP error level; only used when $wgDevelopmentWarnings
3119  *        is true
3120  */
3121 function wfWarn( $msg, $callerOffset = 1, $level = E_USER_NOTICE ) {
3122         $callers = wfDebugBacktrace();
3123         if( isset( $callers[$callerOffset+1] ) ){
3124                 $callerfunc = $callers[$callerOffset+1];
3125                 $callerfile = $callers[$callerOffset];
3126                 if( isset( $callerfile['file'] ) && isset( $callerfile['line'] ) ){
3127                         $file = $callerfile['file'] . ' at line ' . $callerfile['line'];
3128                 } else {
3129                         $file = '(internal function)';
3130                 }
3131                 $func = '';
3132                 if( isset( $callerfunc['class'] ) )
3133                         $func .= $callerfunc['class'] . '::';
3134                 $func .= @$callerfunc['function'];
3135                 $msg .= " [Called from $func in $file]";
3136         }
3137
3138         global $wgDevelopmentWarnings;
3139         if ( $wgDevelopmentWarnings ) {
3140                 trigger_error( $msg, $level );
3141         } else {
3142                 wfDebug( "$msg\n" );
3143         }
3144 }
3145
3146 /**
3147  * Sleep until the worst slave's replication lag is less than or equal to
3148  * $maxLag, in seconds.  Use this when updating very large numbers of rows, as
3149  * in maintenance scripts, to avoid causing too much lag.  Of course, this is
3150  * a no-op if there are no slaves.
3151  *
3152  * Every time the function has to wait for a slave, it will print a message to
3153  * that effect (and then sleep for a little while), so it's probably not best
3154  * to use this outside maintenance scripts in its present form.
3155  *
3156  * @param $maxLag Integer
3157  * @param $wiki mixed Wiki identifier accepted by wfGetLB
3158  * @return null
3159  */
3160 function wfWaitForSlaves( $maxLag, $wiki = false ) {
3161         if( $maxLag ) {
3162                 $lb = wfGetLB( $wiki );
3163                 list( $host, $lag ) = $lb->getMaxLag( $wiki );
3164                 while( $lag > $maxLag ) {
3165                         $name = @gethostbyaddr( $host );
3166                         if( $name !== false ) {
3167                                 $host = $name;
3168                         }
3169                         print "Waiting for $host (lagged $lag seconds)...\n";
3170                         sleep($maxLag);
3171                         list( $host, $lag ) = $lb->getMaxLag();
3172                 }
3173         }
3174 }
3175
3176 /**
3177  * Output some plain text in command-line mode or in the installer (updaters.inc).
3178  * Do not use it in any other context, its behaviour is subject to change.
3179  */
3180 function wfOut( $s ) {
3181         static $lineStarted = false;
3182         global $wgCommandLineMode;
3183         if ( $wgCommandLineMode && !defined( 'MEDIAWIKI_INSTALL' ) ) {
3184                 echo $s;
3185         } else {
3186                 echo htmlspecialchars( $s );
3187         }
3188         flush();
3189 }
3190
3191 /**
3192  * Count down from $n to zero on the terminal, with a one-second pause
3193  * between showing each number. For use in command-line scripts.
3194  */
3195 function wfCountDown( $n ) {
3196         for ( $i = $n; $i >= 0; $i-- ) {
3197                 if ( $i != $n ) {
3198                         echo str_repeat( "\x08", strlen( $i + 1 ) );
3199                 }
3200                 echo $i;
3201                 flush();
3202                 if ( $i ) {
3203                         sleep( 1 );
3204                 }
3205         }
3206         echo "\n";
3207 }
3208
3209 /** Generate a random 32-character hexadecimal token.
3210  * @param $salt Mixed: some sort of salt, if necessary, to add to random
3211  *              characters before hashing.
3212  */
3213 function wfGenerateToken( $salt = '' ) {
3214         $salt = serialize($salt);
3215
3216         return md5( mt_rand( 0, 0x7fffffff ) . $salt );
3217 }
3218
3219 /**
3220  * Replace all invalid characters with -
3221  * @param $name Mixed: filename to process
3222  */
3223 function wfStripIllegalFilenameChars( $name ) {
3224         global $wgIllegalFileChars;
3225         $name = wfBaseName( $name );
3226         $name = preg_replace("/[^".Title::legalChars()."]".($wgIllegalFileChars ? "|[".$wgIllegalFileChars."]":"")."/",'-',$name);
3227         return $name;
3228 }
3229
3230 /**
3231  * Insert array into another array after the specified *KEY*
3232  * @param $array Array: The array.
3233  * @param $insert Array: The array to insert.
3234  * @param $after Mixed: The key to insert after
3235  */
3236 function wfArrayInsertAfter( $array, $insert, $after ) {
3237         // Find the offset of the element to insert after.
3238         $keys = array_keys($array);
3239         $offsetByKey = array_flip( $keys );
3240
3241         $offset = $offsetByKey[$after];
3242
3243         // Insert at the specified offset
3244         $before = array_slice( $array, 0, $offset + 1, true );
3245         $after = array_slice( $array, $offset + 1, count($array)-$offset, true );
3246
3247         $output = $before + $insert + $after;
3248
3249         return $output;
3250 }
3251
3252 /* Recursively converts the parameter (an object) to an array with the same data */
3253 function wfObjectToArray( $object, $recursive = true ) {
3254         $array = array();
3255         foreach ( get_object_vars($object) as $key => $value ) {
3256                 if ( is_object($value) && $recursive ) {
3257                         $value = wfObjectToArray( $value );
3258                 }
3259
3260                 $array[$key] = $value;
3261         }
3262
3263         return $array;
3264 }
3265
3266 /**
3267  * Set PHP's memory limit to the larger of php.ini or $wgMemoryLimit;
3268  * @return Integer value memory was set to.
3269  */
3270
3271 function wfMemoryLimit () {
3272         global $wgMemoryLimit;
3273         $memlimit = wfShorthandToInteger( ini_get( "memory_limit" ) );
3274         $conflimit = wfShorthandToInteger( $wgMemoryLimit );
3275         if( $memlimit != -1 ) {
3276                 if( $conflimit == -1 ) {
3277                         wfDebug( "Removing PHP's memory limit\n" );
3278                         wfSuppressWarnings();
3279                         ini_set( "memory_limit", $conflimit );
3280                         wfRestoreWarnings();
3281                         return $conflimit;
3282                 } elseif ( $conflimit > $memlimit ) {
3283                         wfDebug( "Raising PHP's memory limit to $conflimit bytes\n" );
3284                         wfSuppressWarnings();
3285                         ini_set( "memory_limit", $conflimit );
3286                         wfRestoreWarnings();
3287                         return $conflimit;
3288                 }
3289         }
3290         return $memlimit;
3291 }
3292
3293 /**
3294  * Converts shorthand byte notation to integer form
3295  * @param $string String
3296  * @return Integer
3297  */
3298 function wfShorthandToInteger ( $string = '' ) {
3299         $string = trim($string);
3300         if( empty($string) ) { return -1; }
3301         $last = strtolower($string[strlen($string)-1]);
3302         $val = intval($string);
3303         switch($last) {
3304                 case 'g':
3305                         $val *= 1024;
3306                 case 'm':
3307                         $val *= 1024;
3308                 case 'k':
3309                         $val *= 1024;
3310         }
3311
3312         return $val;
3313 }
3314
3315 /* Get the normalised IETF language tag
3316  * @param $code String: The language code.
3317  * @return $langCode String: The language code which complying with BCP 47 standards.
3318  */
3319 function wfBCP47( $code ) {
3320         $codeSegment = explode( '-', $code );
3321         foreach ( $codeSegment as $segNo => $seg ) {
3322                 if ( count( $codeSegment ) > 0 ) {
3323                         // ISO 3166 country code
3324                         if ( ( strlen( $seg ) == 2 ) && ( $segNo > 0 ) )
3325                                 $codeBCP[$segNo] = strtoupper( $seg );
3326                         // ISO 15924 script code
3327                         else if ( ( strlen( $seg ) == 4 ) && ( $segNo > 0 ) )
3328                                 $codeBCP[$segNo] = ucfirst( $seg );
3329                         // Use lowercase for other cases
3330                         else
3331                                 $codeBCP[$segNo] = strtolower( $seg );
3332                 } else {
3333                 // Use lowercase for single segment
3334                         $codeBCP[$segNo] = strtolower( $seg );
3335                 }
3336         }
3337         $langCode = implode ( '-' , $codeBCP );
3338         return $langCode;
3339 }
3340
3341 function wfArrayMap( $function, $input ) {
3342         $ret = array_map( $function, $input );
3343         foreach ( $ret as $key => $value ) {
3344                 $taint = istainted( $input[$key] );
3345                 if ( $taint ) {
3346                         taint( $ret[$key], $taint );
3347                 }
3348         }
3349         return $ret;
3350 }