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 /**
  12  * Some globals and requires needed
  13  */
  14
  15 /** Total number of articles */
  16 $wgNumberOfArticles = -1; # Unset
  17
  18 /** Total number of views */
  19 $wgTotalViews = -1;
  20
  21 /** Total number of edits */
  22 $wgTotalEdits = -1;
  23
  24
  25 require_once dirname(__FILE__) . '/LogPage.php';
  26 require_once dirname(__FILE__) . '/normal/UtfNormalUtil.php';
  27 require_once dirname(__FILE__) . '/XmlFunctions.php';
  28
  29 /**
  30  * Compatibility functions
  31  *
  32  * We more or less support PHP 5.0.x and up.
  33  * Re-implementations of newer functions or functions in non-standard
  34  * PHP extensions may be included here.
  35  */
  36 if( !function_exists('iconv') ) {
  37         # iconv support is not in the default configuration and so may not be present.
  38         # Assume will only ever use utf-8 and iso-8859-1.
  39         # This will *not* work in all circumstances.
  40         function iconv( $from, $to, $string ) {
  41                 if(strcasecmp( $from, $to ) == 0) return $string;
  42                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  43                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  44                 return $string;
  45         }
  46 }
  47
  48 # UTF-8 substr function based on a PHP manual comment
  49 if ( !function_exists( 'mb_substr' ) ) {
  50         function mb_substr( $str, $start ) {
  51                 $ar = array();
  52                 preg_match_all( '/./us', $str, $ar );
  53
  54                 if( func_num_args() >= 3 ) {
  55                         $end = func_get_arg( 2 );
  56                         return join( '', array_slice( $ar[0], $start, $end ) );
  57                 } else {
  58                         return join( '', array_slice( $ar[0], $start ) );
  59                 }
  60         }
  61 }
  62
  63 if ( !function_exists( 'mb_strlen' ) ) {
  64         /**
  65          * Fallback implementation of mb_strlen, hardcoded to UTF-8.
  66          * @param string $str
  67          * @param string $enc optional encoding; ignored
  68          * @return int
  69          */
  70         function mb_strlen( $str, $enc="" ) {
  71                 $counts = count_chars( $str );
  72                 $total = 0;
  73
  74                 // Count ASCII bytes
  75                 for( $i = 0; $i < 0x80; $i++ ) {
  76                         $total += $counts[$i];
  77                 }
  78
  79                 // Count multibyte sequence heads
  80                 for( $i = 0xc0; $i < 0xff; $i++ ) {
  81                         $total += $counts[$i];
  82                 }
  83                 return $total;
  84         }
  85 }
  86
  87 if ( !function_exists( 'array_diff_key' ) ) {
  88         /**
  89          * Exists in PHP 5.1.0+
  90          * Not quite compatible, two-argument version only
  91          * Null values will cause problems due to this use of isset()
  92          */
  93         function array_diff_key( $left, $right ) {
  94                 $result = $left;
  95                 foreach ( $left as $key => $unused ) {
  96                         if ( isset( $right[$key] ) ) {
  97                                 unset( $result[$key] );
  98                         }
  99                 }
 100                 return $result;
 101         }
 102 }
 103
 104
 105 /**
 106  * Wrapper for clone(), for compatibility with PHP4-friendly extensions.
 107  * PHP 5 won't let you declare a 'clone' function, even conditionally,
 108  * so it has to be a wrapper with a different name.
 109  */
 110 function wfClone( $object ) {
 111         return clone( $object );
 112 }
 113
 114 /**
 115  * Where as we got a random seed
 116  */
 117 $wgRandomSeeded = false;
 118
 119 /**
 120  * Seed Mersenne Twister
 121  * No-op for compatibility; only necessary in PHP < 4.2.0
 122  */
 123 function wfSeedRandom() {
 124         /* No-op */
 125 }
 126
 127 /**
 128  * Get a random decimal value between 0 and 1, in a way
 129  * not likely to give duplicate values for any realistic
 130  * number of articles.
 131  *
 132  * @return string
 133  */
 134 function wfRandom() {
 135         # The maximum random value is "only" 2^31-1, so get two random
 136         # values to reduce the chance of dupes
 137         $max = mt_getrandmax() + 1;
 138         $rand = number_format( (mt_rand() * $max + mt_rand())
 139                 / $max / $max, 12, '.', '' );
 140         return $rand;
 141 }
 142
 143 /**
 144  * We want / and : to be included as literal characters in our title URLs.
 145  * %2F in the page titles seems to fatally break for some reason.
 146  *
 147  * @param $s String:
 148  * @return string
 149 */
 150 function wfUrlencode ( $s ) {
 151         $s = urlencode( $s );
 152         $s = preg_replace( '/%3[Aa]/', ':', $s );
 153         $s = preg_replace( '/%2[Ff]/', '/', $s );
 154
 155         return $s;
 156 }
 157
 158 /**
 159  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 160  * In normal operation this is a NOP.
 161  *
 162  * Controlling globals:
 163  * $wgDebugLogFile - points to the log file
 164  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 165  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 166  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 167  *
 168  * @param $text String
 169  * @param $logonly Bool: set true to avoid appearing in HTML when $wgDebugComments is set
 170  */
 171 function wfDebug( $text, $logonly = false ) {
 172         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 173         static $recursion = 0;
 174
 175         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 176         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 177                 return;
 178         }
 179
 180         if ( $wgDebugComments && !$logonly ) {
 181                 if ( !isset( $wgOut ) ) {
 182                         return;
 183                 }
 184                 if ( !StubObject::isRealObject( $wgOut ) ) {
 185                         if ( $recursion ) {
 186                                 return;
 187                         }
 188                         $recursion++;
 189                         $wgOut->_unstub();
 190                         $recursion--;
 191                 }
 192                 $wgOut->debug( $text );
 193         }
 194         if ( '' != $wgDebugLogFile && !$wgProfileOnly ) {
 195                 # Strip unprintables; they can switch terminal modes when binary data
 196                 # gets dumped, which is pretty annoying.
 197                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 198                 wfErrorLog( $text, $wgDebugLogFile );
 199         }
 200 }
 201
 202 /**
 203  * Send a line to a supplementary debug log file, if configured, or main debug log if not.
 204  * $wgDebugLogGroups[$logGroup] should be set to a filename to send to a separate log.
 205  *
 206  * @param $logGroup String
 207  * @param $text String
 208  * @param $public Bool: whether to log the event in the public log if no private
 209  *                     log file is specified, (default true)
 210  */
 211 function wfDebugLog( $logGroup, $text, $public = true ) {
 212         global $wgDebugLogGroups;
 213         if( $text{strlen( $text ) - 1} != "\n" ) $text .= "\n";
 214         if( isset( $wgDebugLogGroups[$logGroup] ) ) {
 215                 $time = wfTimestamp( TS_DB );
 216                 $wiki = wfWikiID();
 217                 wfErrorLog( "$time $wiki: $text", $wgDebugLogGroups[$logGroup] );
 218         } else if ( $public === true ) {
 219                 wfDebug( $text, true );
 220         }
 221 }
 222
 223 /**
 224  * Log for database errors
 225  * @param $text String: database error message.
 226  */
 227 function wfLogDBError( $text ) {
 228         global $wgDBerrorLog, $wgDBname;
 229         if ( $wgDBerrorLog ) {
 230                 $host = trim(`hostname`);
 231                 $text = date('D M j G:i:s T Y') . "\t$host\t$wgDBname\t$text";
 232                 wfErrorLog( $text, $wgDBerrorLog );
 233         }
 234 }
 235
 236 /**
 237  * Log to a file without getting "file size exceeded" signals
 238  */
 239 function wfErrorLog( $text, $file ) {
 240         wfSuppressWarnings();
 241         $exists = file_exists( $file );
 242         $size = $exists ? filesize( $file ) : false;
 243         if ( !$exists || ( $size !== false && $size + strlen( $text ) < 0x7fffffff ) ) {
 244                 error_log( $text, 3, $file );
 245         }
 246         wfRestoreWarnings();
 247 }
 248
 249 /**
 250  * @todo document
 251  */
 252 function wfLogProfilingData() {
 253         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 254         global $wgProfiling, $wgUser;
 255         if ( $wgProfiling ) {
 256                 $now = wfTime();
 257                 $elapsed = $now - $wgRequestTime;
 258                 $prof = wfGetProfilingOutput( $wgRequestTime, $elapsed );
 259                 $forward = '';
 260                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 261                         $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 262                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 263                         $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 264                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 265                         $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 266                 if( $forward )
 267                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 268                 // Don't unstub $wgUser at this late stage just for statistics purposes
 269                 if( StubObject::isRealObject($wgUser) && $wgUser->isAnon() )
 270                         $forward .= ' anon';
 271                 $log = sprintf( "%s\t%04.3f\t%s\n",
 272                   gmdate( 'YmdHis' ), $elapsed,
 273                   urldecode( $wgRequest->getRequestURL() . $forward ) );
 274                 if ( '' != $wgDebugLogFile && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 275                         wfErrorLog( $log . $prof, $wgDebugLogFile );
 276                 }
 277         }
 278 }
 279
 280 /**
 281  * Check if the wiki read-only lock file is present. This can be used to lock
 282  * off editing functions, but doesn't guarantee that the database will not be
 283  * modified.
 284  * @return bool
 285  */
 286 function wfReadOnly() {
 287         global $wgReadOnlyFile, $wgReadOnly;
 288
 289         if ( !is_null( $wgReadOnly ) ) {
 290                 return (bool)$wgReadOnly;
 291         }
 292         if ( '' == $wgReadOnlyFile ) {
 293                 return false;
 294         }
 295         // Set $wgReadOnly for faster access next time
 296         if ( is_file( $wgReadOnlyFile ) ) {
 297                 $wgReadOnly = file_get_contents( $wgReadOnlyFile );
 298         } else {
 299                 $wgReadOnly = false;
 300         }
 301         return (bool)$wgReadOnly;
 302 }
 303
 304
 305 /**
 306  * Get a message from anywhere, for the current user language.
 307  *
 308  * Use wfMsgForContent() instead if the message should NOT
 309  * change depending on the user preferences.
 310  *
 311  * Note that the message may contain HTML, and is therefore
 312  * not safe for insertion anywhere. Some functions such as
 313  * addWikiText will do the escaping for you. Use wfMsgHtml()
 314  * if you need an escaped message.
 315  *
 316  * @param $key String: lookup key for the message, usually
 317  *    defined in languages/Language.php
 318  *
 319  * This function also takes extra optional parameters (not
 320  * shown in the function definition), which can by used to
 321  * insert variable text into the predefined message.
 322  */
 323 function wfMsg( $key ) {
 324         $args = func_get_args();
 325         array_shift( $args );
 326         return wfMsgReal( $key, $args, true );
 327 }
 328
 329 /**
 330  * Same as above except doesn't transform the message
 331  */
 332 function wfMsgNoTrans( $key ) {
 333         $args = func_get_args();
 334         array_shift( $args );
 335         return wfMsgReal( $key, $args, true, false, false );
 336 }
 337
 338 /**
 339  * Get a message from anywhere, for the current global language
 340  * set with $wgLanguageCode.
 341  *
 342  * Use this if the message should NOT change  dependent on the
 343  * language set in the user's preferences. This is the case for
 344  * most text written into logs, as well as link targets (such as
 345  * the name of the copyright policy page). Link titles, on the
 346  * other hand, should be shown in the UI language.
 347  *
 348  * Note that MediaWiki allows users to change the user interface
 349  * language in their preferences, but a single installation
 350  * typically only contains content in one language.
 351  *
 352  * Be wary of this distinction: If you use wfMsg() where you should
 353  * use wfMsgForContent(), a user of the software may have to
 354  * customize over 70 messages in order to, e.g., fix a link in every
 355  * possible language.
 356  *
 357  * @param $key String: lookup key for the message, usually
 358  *    defined in languages/Language.php
 359  */
 360 function wfMsgForContent( $key ) {
 361         global $wgForceUIMsgAsContentMsg;
 362         $args = func_get_args();
 363         array_shift( $args );
 364         $forcontent = true;
 365         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 366                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 367                 $forcontent = false;
 368         return wfMsgReal( $key, $args, true, $forcontent );
 369 }
 370
 371 /**
 372  * Same as above except doesn't transform the message
 373  */
 374 function wfMsgForContentNoTrans( $key ) {
 375         global $wgForceUIMsgAsContentMsg;
 376         $args = func_get_args();
 377         array_shift( $args );
 378         $forcontent = true;
 379         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 380                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 381                 $forcontent = false;
 382         return wfMsgReal( $key, $args, true, $forcontent, false );
 383 }
 384
 385 /**
 386  * Get a message from the language file, for the UI elements
 387  */
 388 function wfMsgNoDB( $key ) {
 389         $args = func_get_args();
 390         array_shift( $args );
 391         return wfMsgReal( $key, $args, false );
 392 }
 393
 394 /**
 395  * Get a message from the language file, for the content
 396  */
 397 function wfMsgNoDBForContent( $key ) {
 398         global $wgForceUIMsgAsContentMsg;
 399         $args = func_get_args();
 400         array_shift( $args );
 401         $forcontent = true;
 402         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 403                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 404                 $forcontent = false;
 405         return wfMsgReal( $key, $args, false, $forcontent );
 406 }
 407
 408
 409 /**
 410  * Really get a message
 411  * @param $key String: key to get.
 412  * @param $args
 413  * @param $useDB Boolean
 414  * @param $transform Boolean: Whether or not to transform the message.
 415  * @param $forContent Boolean
 416  * @return String: the requested message.
 417  */
 418 function wfMsgReal( $key, $args, $useDB = true, $forContent=false, $transform = true ) {
 419         $fname = 'wfMsgReal';
 420         wfProfileIn( $fname );
 421         $message = wfMsgGetKey( $key, $useDB, $forContent, $transform );
 422         $message = wfMsgReplaceArgs( $message, $args );
 423         wfProfileOut( $fname );
 424         return $message;
 425 }
 426
 427 /**
 428  * This function provides the message source for messages to be edited which are *not* stored in the database.
 429  * @param $key String:
 430  */
 431 function wfMsgWeirdKey ( $key ) {
 432         $source = wfMsgGetKey( $key, false, true, false );
 433         if ( wfEmptyMsg( $key, $source ) )
 434                 return "";
 435         else
 436                 return $source;
 437 }
 438
 439 /**
 440  * Fetch a message string value, but don't replace any keys yet.
 441  * @param string $key
 442  * @param bool $useDB
 443  * @param bool $forContent
 444  * @return string
 445  * @private
 446  */
 447 function wfMsgGetKey( $key, $useDB, $forContent = false, $transform = true ) {
 448         global $wgParser, $wgContLang, $wgMessageCache, $wgLang;
 449
 450         /* <Vyznev> btw, is all that code in wfMsgGetKey() that check
 451          * if the message cache exists of not really necessary, or is
 452          * it just paranoia?
 453          * <TimStarling> Vyznev: it's probably not necessary
 454          * <TimStarling> I think I wrote it in an attempt to report DB
 455          * connection errors properly
 456          * <TimStarling> but eventually we gave up on using the
 457          * message cache for that and just hard-coded the strings
 458          * <TimStarling> it may have other uses, it's not mere paranoia
 459          */
 460
 461         if ( is_object( $wgMessageCache ) )
 462                 $transstat = $wgMessageCache->getTransform();
 463
 464         if( is_object( $wgMessageCache ) ) {
 465                 if ( ! $transform )
 466                         $wgMessageCache->disableTransform();
 467                 $message = $wgMessageCache->get( $key, $useDB, $forContent );
 468         } else {
 469                 if( $forContent ) {
 470                         $lang = &$wgContLang;
 471                 } else {
 472                         $lang = &$wgLang;
 473                 }
 474
 475                 # MessageCache::get() does this already, Language::getMessage() doesn't
 476                 # ISSUE: Should we try to handle "message/lang" here too?
 477                 $key = str_replace( ' ' , '_' , $wgContLang->lcfirst( $key ) );
 478
 479                 wfSuppressWarnings();
 480                 if( is_object( $lang ) ) {
 481                         $message = $lang->getMessage( $key );
 482                 } else {
 483                         $message = false;
 484                 }
 485                 wfRestoreWarnings();
 486
 487                 if ( $transform && strstr( $message, '{{' ) !== false ) {
 488                         $message = $wgParser->transformMsg($message, $wgMessageCache->getParserOptions() );
 489                 }
 490         }
 491
 492         if ( is_object( $wgMessageCache ) && ! $transform )
 493                 $wgMessageCache->setTransform( $transstat );
 494
 495         return $message;
 496 }
 497
 498 /**
 499  * Replace message parameter keys on the given formatted output.
 500  *
 501  * @param string $message
 502  * @param array $args
 503  * @return string
 504  * @private
 505  */
 506 function wfMsgReplaceArgs( $message, $args ) {
 507         # Fix windows line-endings
 508         # Some messages are split with explode("\n", $msg)
 509         $message = str_replace( "\r", '', $message );
 510
 511         // Replace arguments
 512         if ( count( $args ) ) {
 513                 if ( is_array( $args[0] ) ) {
 514                         foreach ( $args[0] as $key => $val ) {
 515                                 $message = str_replace( '$' . $key, $val, $message );
 516                         }
 517                 } else {
 518                         foreach( $args as $n => $param ) {
 519                                 $replacementKeys['$' . ($n + 1)] = $param;
 520                         }
 521                         $message = strtr( $message, $replacementKeys );
 522                 }
 523         }
 524
 525         return $message;
 526 }
 527
 528 /**
 529  * Return an HTML-escaped version of a message.
 530  * Parameter replacements, if any, are done *after* the HTML-escaping,
 531  * so parameters may contain HTML (eg links or form controls). Be sure
 532  * to pre-escape them if you really do want plaintext, or just wrap
 533  * the whole thing in htmlspecialchars().
 534  *
 535  * @param string $key
 536  * @param string ... parameters
 537  * @return string
 538  */
 539 function wfMsgHtml( $key ) {
 540         $args = func_get_args();
 541         array_shift( $args );
 542         return wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $key, true ) ), $args );
 543 }
 544
 545 /**
 546  * Return an HTML version of message
 547  * Parameter replacements, if any, are done *after* parsing the wiki-text message,
 548  * so parameters may contain HTML (eg links or form controls). Be sure
 549  * to pre-escape them if you really do want plaintext, or just wrap
 550  * the whole thing in htmlspecialchars().
 551  *
 552  * @param string $key
 553  * @param string ... parameters
 554  * @return string
 555  */
 556 function wfMsgWikiHtml( $key ) {
 557         global $wgOut;
 558         $args = func_get_args();
 559         array_shift( $args );
 560         return wfMsgReplaceArgs( $wgOut->parse( wfMsgGetKey( $key, true ), /* can't be set to false */ true ), $args );
 561 }
 562
 563 /**
 564  * Returns message in the requested format
 565  * @param string $key Key of the message
 566  * @param array $options Processing rules:
 567  *  <i>parse</i>: parses wikitext to html
 568  *  <i>parseinline</i>: parses wikitext to html and removes the surrounding p's added by parser or tidy
 569  *  <i>escape</i>: filters message trough htmlspecialchars
 570  *  <i>replaceafter</i>: parameters are substituted after parsing or escaping
 571  *  <i>parsemag</i>: transform the message using magic phrases
 572  */
 573 function wfMsgExt( $key, $options ) {
 574         global $wgOut, $wgParser;
 575
 576         $args = func_get_args();
 577         array_shift( $args );
 578         array_shift( $args );
 579
 580         if( !is_array($options) ) {
 581                 $options = array($options);
 582         }
 583
 584         $string = wfMsgGetKey( $key, true, false, false );
 585
 586         if( !in_array('replaceafter', $options) ) {
 587                 $string = wfMsgReplaceArgs( $string, $args );
 588         }
 589
 590         if( in_array('parse', $options) ) {
 591                 $string = $wgOut->parse( $string, true, true );
 592         } elseif ( in_array('parseinline', $options) ) {
 593                 $string = $wgOut->parse( $string, true, true );
 594                 $m = array();
 595                 if( preg_match( '/^<p>(.*)\n?<\/p>$/sU', $string, $m ) ) {
 596                         $string = $m[1];
 597                 }
 598         } elseif ( in_array('parsemag', $options) ) {
 599                 global $wgMessageCache;
 600                 if ( isset( $wgMessageCache ) ) {
 601                         $string = $wgMessageCache->transform( $string );
 602                 }
 603         }
 604
 605         if ( in_array('escape', $options) ) {
 606                 $string = htmlspecialchars ( $string );
 607         }
 608
 609         if( in_array('replaceafter', $options) ) {
 610                 $string = wfMsgReplaceArgs( $string, $args );
 611         }
 612
 613         return $string;
 614 }
 615
 616
 617 /**
 618  * Just like exit() but makes a note of it.
 619  * Commits open transactions except if the error parameter is set
 620  *
 621  * @deprecated Please return control to the caller or throw an exception
 622  */
 623 function wfAbruptExit( $error = false ){
 624         global $wgLoadBalancer;
 625         static $called = false;
 626         if ( $called ){
 627                 exit( -1 );
 628         }
 629         $called = true;
 630
 631         $bt = wfDebugBacktrace();
 632         if( $bt ) {
 633                 for($i = 0; $i < count($bt) ; $i++){
 634                         $file = isset($bt[$i]['file']) ? $bt[$i]['file'] : "unknown";
 635                         $line = isset($bt[$i]['line']) ? $bt[$i]['line'] : "unknown";
 636                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 637                 }
 638         } else {
 639                 wfDebug('WARNING: Abrupt exit\n');
 640         }
 641
 642         wfLogProfilingData();
 643
 644         if ( !$error ) {
 645                 $wgLoadBalancer->closeAll();
 646         }
 647         exit( -1 );
 648 }
 649
 650 /**
 651  * @deprecated Please return control the caller or throw an exception
 652  */
 653 function wfErrorExit() {
 654         wfAbruptExit( true );
 655 }
 656
 657 /**
 658  * Print a simple message and die, returning nonzero to the shell if any.
 659  * Plain die() fails to return nonzero to the shell if you pass a string.
 660  * @param string $msg
 661  */
 662 function wfDie( $msg='' ) {
 663         echo $msg;
 664         die( 1 );
 665 }
 666
 667 /**
 668  * Throw a debugging exception. This function previously once exited the process,
 669  * but now throws an exception instead, with similar results.
 670  *
 671  * @param string $msg Message shown when dieing.
 672  */
 673 function wfDebugDieBacktrace( $msg = '' ) {
 674         throw new MWException( $msg );
 675 }
 676
 677 /**
 678  * Fetch server name for use in error reporting etc.
 679  * Use real server name if available, so we know which machine
 680  * in a server farm generated the current page.
 681  * @return string
 682  */
 683 function wfHostname() {
 684         if ( function_exists( 'posix_uname' ) ) {
 685                 // This function not present on Windows
 686                 $uname = @posix_uname();
 687         } else {
 688                 $uname = false;
 689         }
 690         if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 691                 return $uname['nodename'];
 692         } else {
 693                 # This may be a virtual server.
 694                 return $_SERVER['SERVER_NAME'];
 695         }
 696 }
 697
 698         /**
 699          * Returns a HTML comment with the elapsed time since request.
 700          * This method has no side effects.
 701          * @return string
 702          */
 703         function wfReportTime() {
 704                 global $wgRequestTime;
 705
 706                 $now = wfTime();
 707                 $elapsed = $now - $wgRequestTime;
 708
 709                 $com = sprintf( "<!-- Served by %s in %01.3f secs. -->",
 710                   wfHostname(), $elapsed );
 711                 return $com;
 712         }
 713
 714 /**
 715  * Safety wrapper for debug_backtrace().
 716  *
 717  * With Zend Optimizer 3.2.0 loaded, this causes segfaults under somewhat
 718  * murky circumstances, which may be triggered in part by stub objects
 719  * or other fancy talkin'.
 720  *
 721  * Will return an empty array if Zend Optimizer is detected, otherwise
 722  * the output from debug_backtrace() (trimmed).
 723  *
 724  * @return array of backtrace information
 725  */
 726 function wfDebugBacktrace() {
 727         if( extension_loaded( 'Zend Optimizer' ) ) {
 728                 wfDebug( "Zend Optimizer detected; skipping debug_backtrace for safety.\n" );
 729                 return array();
 730         } else {
 731                 return array_slice( debug_backtrace(), 1 );
 732         }
 733 }
 734
 735 function wfBacktrace() {
 736         global $wgCommandLineMode;
 737
 738         if ( $wgCommandLineMode ) {
 739                 $msg = '';
 740         } else {
 741                 $msg = "<ul>\n";
 742         }
 743         $backtrace = wfDebugBacktrace();
 744         foreach( $backtrace as $call ) {
 745                 if( isset( $call['file'] ) ) {
 746                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 747                         $file = $f[count($f)-1];
 748                 } else {
 749                         $file = '-';
 750                 }
 751                 if( isset( $call['line'] ) ) {
 752                         $line = $call['line'];
 753                 } else {
 754                         $line = '-';
 755                 }
 756                 if ( $wgCommandLineMode ) {
 757                         $msg .= "$file line $line calls ";
 758                 } else {
 759                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
 760                 }
 761                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 762                 $msg .= $call['function'] . '()';
 763
 764                 if ( $wgCommandLineMode ) {
 765                         $msg .= "\n";
 766                 } else {
 767                         $msg .= "</li>\n";
 768                 }
 769         }
 770         if ( $wgCommandLineMode ) {
 771                 $msg .= "\n";
 772         } else {
 773                 $msg .= "</ul>\n";
 774         }
 775
 776         return $msg;
 777 }
 778
 779
 780 /* Some generic result counters, pulled out of SearchEngine */
 781
 782
 783 /**
 784  * @todo document
 785  */
 786 function wfShowingResults( $offset, $limit ) {
 787         global $wgLang;
 788         return wfMsgExt( 'showingresults', array( 'parseinline' ), $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 789 }
 790
 791 /**
 792  * @todo document
 793  */
 794 function wfShowingResultsNum( $offset, $limit, $num ) {
 795         global $wgLang;
 796         return wfMsgExt( 'showingresultsnum', array( 'parseinline' ), $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 797 }
 798
 799 /**
 800  * @todo document
 801  */
 802 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
 803         global $wgLang;
 804         $fmtLimit = $wgLang->formatNum( $limit );
 805         $prev = wfMsg( 'prevn', $fmtLimit );
 806         $next = wfMsg( 'nextn', $fmtLimit );
 807
 808         if( is_object( $link ) ) {
 809                 $title =& $link;
 810         } else {
 811                 $title = Title::newFromText( $link );
 812                 if( is_null( $title ) ) {
 813                         return false;
 814                 }
 815         }
 816
 817         if ( 0 != $offset ) {
 818                 $po = $offset - $limit;
 819                 if ( $po < 0 ) { $po = 0; }
 820                 $q = "limit={$limit}&offset={$po}";
 821                 if ( '' != $query ) { $q .= '&'.$query; }
 822                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" class=\"mw-prevlink\">{$prev}</a>";
 823         } else { $plink = $prev; }
 824
 825         $no = $offset + $limit;
 826         $q = 'limit='.$limit.'&offset='.$no;
 827         if ( '' != $query ) { $q .= '&'.$query; }
 828
 829         if ( $atend ) {
 830                 $nlink = $next;
 831         } else {
 832                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" class=\"mw-nextlink\">{$next}</a>";
 833         }
 834         $nums = wfNumLink( $offset, 20, $title, $query ) . ' | ' .
 835           wfNumLink( $offset, 50, $title, $query ) . ' | ' .
 836           wfNumLink( $offset, 100, $title, $query ) . ' | ' .
 837           wfNumLink( $offset, 250, $title, $query ) . ' | ' .
 838           wfNumLink( $offset, 500, $title, $query );
 839
 840         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 841 }
 842
 843 /**
 844  * @todo document
 845  */
 846 function wfNumLink( $offset, $limit, &$title, $query = '' ) {
 847         global $wgLang;
 848         if ( '' == $query ) { $q = ''; }
 849         else { $q = $query.'&'; }
 850         $q .= 'limit='.$limit.'&offset='.$offset;
 851
 852         $fmtLimit = $wgLang->formatNum( $limit );
 853         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\" class=\"mw-numlink\">{$fmtLimit}</a>";
 854         return $s;
 855 }
 856
 857 /**
 858  * @todo document
 859  * @todo FIXME: we may want to blacklist some broken browsers
 860  *
 861  * @return bool Whereas client accept gzip compression
 862  */
 863 function wfClientAcceptsGzip() {
 864         global $wgUseGzip;
 865         if( $wgUseGzip ) {
 866                 # FIXME: we may want to blacklist some broken browsers
 867                 $m = array();
 868                 if( preg_match(
 869                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 870                         $_SERVER['HTTP_ACCEPT_ENCODING'],
 871                         $m ) ) {
 872                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
 873                         wfDebug( " accepts gzip\n" );
 874                         return true;
 875                 }
 876         }
 877         return false;
 878 }
 879
 880 /**
 881  * Obtain the offset and limit values from the request string;
 882  * used in special pages
 883  *
 884  * @param $deflimit Default limit if none supplied
 885  * @param $optionname Name of a user preference to check against
 886  * @return array
 887  *
 888  */
 889 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
 890         global $wgRequest;
 891         return $wgRequest->getLimitOffset( $deflimit, $optionname );
 892 }
 893
 894 /**
 895  * Escapes the given text so that it may be output using addWikiText()
 896  * without any linking, formatting, etc. making its way through. This
 897  * is achieved by substituting certain characters with HTML entities.
 898  * As required by the callers, <nowiki> is not used. It currently does
 899  * not filter out characters which have special meaning only at the
 900  * start of a line, such as "*".
 901  *
 902  * @param string $text Text to be escaped
 903  */
 904 function wfEscapeWikiText( $text ) {
 905         $text = str_replace(
 906                 array( '[',     '|',      '\'',    'ISBN ',     'RFC ',     '://',     "\n=",     '{{' ),
 907                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', 'RFC&#32;', '&#58;//', "\n&#61;", '&#123;&#123;' ),
 908                 htmlspecialchars($text) );
 909         return $text;
 910 }
 911
 912 /**
 913  * @todo document
 914  */
 915 function wfQuotedPrintable( $string, $charset = '' ) {
 916         # Probably incomplete; see RFC 2045
 917         if( empty( $charset ) ) {
 918                 global $wgInputEncoding;
 919                 $charset = $wgInputEncoding;
 920         }
 921         $charset = strtoupper( $charset );
 922         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
 923
 924         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 925         $replace = $illegal . '\t ?_';
 926         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 927         $out = "=?$charset?Q?";
 928         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 929         $out .= '?=';
 930         return $out;
 931 }
 932
 933
 934 /**
 935  * @todo document
 936  * @return float
 937  */
 938 function wfTime() {
 939         return microtime(true);
 940 }
 941
 942 /**
 943  * Sets dest to source and returns the original value of dest
 944  * If source is NULL, it just returns the value, it doesn't set the variable
 945  */
 946 function wfSetVar( &$dest, $source ) {
 947         $temp = $dest;
 948         if ( !is_null( $source ) ) {
 949                 $dest = $source;
 950         }
 951         return $temp;
 952 }
 953
 954 /**
 955  * As for wfSetVar except setting a bit
 956  */
 957 function wfSetBit( &$dest, $bit, $state = true ) {
 958         $temp = (bool)($dest & $bit );
 959         if ( !is_null( $state ) ) {
 960                 if ( $state ) {
 961                         $dest |= $bit;
 962                 } else {
 963                         $dest &= ~$bit;
 964                 }
 965         }
 966         return $temp;
 967 }
 968
 969 /**
 970  * This function takes two arrays as input, and returns a CGI-style string, e.g.
 971  * "days=7&limit=100". Options in the first array override options in the second.
 972  * Options set to "" will not be output.
 973  */
 974 function wfArrayToCGI( $array1, $array2 = NULL )
 975 {
 976         if ( !is_null( $array2 ) ) {
 977                 $array1 = $array1 + $array2;
 978         }
 979
 980         $cgi = '';
 981         foreach ( $array1 as $key => $value ) {
 982                 if ( '' !== $value ) {
 983                         if ( '' != $cgi ) {
 984                                 $cgi .= '&';
 985                         }
 986                         $cgi .= urlencode( $key ) . '=' . urlencode( $value );
 987                 }
 988         }
 989         return $cgi;
 990 }
 991
 992 /**
 993  * Append a query string to an existing URL, which may or may not already
 994  * have query string parameters already. If so, they will be combined.
 995  *
 996  * @param string $url
 997  * @param string $query
 998  * @return string
 999  */
1000 function wfAppendQuery( $url, $query ) {
1001         if( $query != '' ) {
1002                 if( false === strpos( $url, '?' ) ) {
1003                         $url .= '?';
1004                 } else {
1005                         $url .= '&';
1006                 }
1007                 $url .= $query;
1008         }
1009         return $url;
1010 }
1011
1012 /**
1013  * This is obsolete, use SquidUpdate::purge()
1014  * @deprecated
1015  */
1016 function wfPurgeSquidServers ($urlArr) {
1017         SquidUpdate::purge( $urlArr );
1018 }
1019
1020 /**
1021  * Windows-compatible version of escapeshellarg()
1022  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
1023  * function puts single quotes in regardless of OS
1024  */
1025 function wfEscapeShellArg( ) {
1026         $args = func_get_args();
1027         $first = true;
1028         $retVal = '';
1029         foreach ( $args as $arg ) {
1030                 if ( !$first ) {
1031                         $retVal .= ' ';
1032                 } else {
1033                         $first = false;
1034                 }
1035
1036                 if ( wfIsWindows() ) {
1037                         // Escaping for an MSVC-style command line parser
1038                         // Ref: http://mailman.lyra.org/pipermail/scite-interest/2002-March/000436.html
1039                         // Double the backslashes before any double quotes. Escape the double quotes.
1040                         $tokens = preg_split( '/(\\\\*")/', $arg, -1, PREG_SPLIT_DELIM_CAPTURE );
1041                         $arg = '';
1042                         $delim = false;
1043                         foreach ( $tokens as $token ) {
1044                                 if ( $delim ) {
1045                                         $arg .= str_replace( '\\', '\\\\', substr( $token, 0, -1 ) ) . '\\"';
1046                                 } else {
1047                                         $arg .= $token;
1048                                 }
1049                                 $delim = !$delim;
1050                         }
1051                         // Double the backslashes before the end of the string, because
1052                         // we will soon add a quote
1053                         $m = array();
1054                         if ( preg_match( '/^(.*?)(\\\\+)$/', $arg, $m ) ) {
1055                                 $arg = $m[1] . str_replace( '\\', '\\\\', $m[2] );
1056                         }
1057
1058                         // Add surrounding quotes
1059                         $retVal .= '"' . $arg . '"';
1060                 } else {
1061                         $retVal .= escapeshellarg( $arg );
1062                 }
1063         }
1064         return $retVal;
1065 }
1066
1067 /**
1068  * wfMerge attempts to merge differences between three texts.
1069  * Returns true for a clean merge and false for failure or a conflict.
1070  */
1071 function wfMerge( $old, $mine, $yours, &$result ){
1072         global $wgDiff3;
1073
1074         # This check may also protect against code injection in
1075         # case of broken installations.
1076         if(! file_exists( $wgDiff3 ) ){
1077                 wfDebug( "diff3 not found\n" );
1078                 return false;
1079         }
1080
1081         # Make temporary files
1082         $td = wfTempDir();
1083         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1084         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
1085         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
1086
1087         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
1088         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
1089         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
1090
1091         # Check for a conflict
1092         $cmd = $wgDiff3 . ' -a --overlap-only ' .
1093           wfEscapeShellArg( $mytextName ) . ' ' .
1094           wfEscapeShellArg( $oldtextName ) . ' ' .
1095           wfEscapeShellArg( $yourtextName );
1096         $handle = popen( $cmd, 'r' );
1097
1098         if( fgets( $handle, 1024 ) ){
1099                 $conflict = true;
1100         } else {
1101                 $conflict = false;
1102         }
1103         pclose( $handle );
1104
1105         # Merge differences
1106         $cmd = $wgDiff3 . ' -a -e --merge ' .
1107           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
1108         $handle = popen( $cmd, 'r' );
1109         $result = '';
1110         do {
1111                 $data = fread( $handle, 8192 );
1112                 if ( strlen( $data ) == 0 ) {
1113                         break;
1114                 }
1115                 $result .= $data;
1116         } while ( true );
1117         pclose( $handle );
1118         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
1119
1120         if ( $result === '' && $old !== '' && $conflict == false ) {
1121                 wfDebug( "Unexpected null result from diff3. Command: $cmd\n" );
1122                 $conflict = true;
1123         }
1124         return ! $conflict;
1125 }
1126
1127 /**
1128  * @todo document
1129  */
1130 function wfVarDump( $var ) {
1131         global $wgOut;
1132         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
1133         if ( headers_sent() || !@is_object( $wgOut ) ) {
1134                 print $s;
1135         } else {
1136                 $wgOut->addHTML( $s );
1137         }
1138 }
1139
1140 /**
1141  * Provide a simple HTTP error.
1142  */
1143 function wfHttpError( $code, $label, $desc ) {
1144         global $wgOut;
1145         $wgOut->disable();
1146         header( "HTTP/1.0 $code $label" );
1147         header( "Status: $code $label" );
1148         $wgOut->sendCacheControl();
1149
1150         header( 'Content-type: text/html; charset=utf-8' );
1151         print "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">".
1152                 "<html><head><title>" .
1153                 htmlspecialchars( $label ) .
1154                 "</title></head><body><h1>" .
1155                 htmlspecialchars( $label ) .
1156                 "</h1><p>" .
1157                 nl2br( htmlspecialchars( $desc ) ) .
1158                 "</p></body></html>\n";
1159 }
1160
1161 /**
1162  * Clear away any user-level output buffers, discarding contents.
1163  *
1164  * Suitable for 'starting afresh', for instance when streaming
1165  * relatively large amounts of data without buffering, or wanting to
1166  * output image files without ob_gzhandler's compression.
1167  *
1168  * The optional $resetGzipEncoding parameter controls suppression of
1169  * the Content-Encoding header sent by ob_gzhandler; by default it
1170  * is left. See comments for wfClearOutputBuffers() for why it would
1171  * be used.
1172  *
1173  * Note that some PHP configuration options may add output buffer
1174  * layers which cannot be removed; these are left in place.
1175  *
1176  * @param bool $resetGzipEncoding
1177  */
1178 function wfResetOutputBuffers( $resetGzipEncoding=true ) {
1179         if( $resetGzipEncoding ) {
1180                 // Suppress Content-Encoding and Content-Length
1181                 // headers from 1.10+s wfOutputHandler
1182                 global $wgDisableOutputCompression;
1183                 $wgDisableOutputCompression = true;
1184         }
1185         while( $status = ob_get_status() ) {
1186                 if( $status['type'] == 0 /* PHP_OUTPUT_HANDLER_INTERNAL */ ) {
1187                         // Probably from zlib.output_compression or other
1188                         // PHP-internal setting which can't be removed.
1189                         //
1190                         // Give up, and hope the result doesn't break
1191                         // output behavior.
1192                         break;
1193                 }
1194                 if( !ob_end_clean() ) {
1195                         // Could not remove output buffer handler; abort now
1196                         // to avoid getting in some kind of infinite loop.
1197                         break;
1198                 }
1199                 if( $resetGzipEncoding ) {
1200                         if( $status['name'] == 'ob_gzhandler' ) {
1201                                 // Reset the 'Content-Encoding' field set by this handler
1202                                 // so we can start fresh.
1203                                 header( 'Content-Encoding:' );
1204                         }
1205                 }
1206         }
1207 }
1208
1209 /**
1210  * More legible than passing a 'false' parameter to wfResetOutputBuffers():
1211  *
1212  * Clear away output buffers, but keep the Content-Encoding header
1213  * produced by ob_gzhandler, if any.
1214  *
1215  * This should be used for HTTP 304 responses, where you need to
1216  * preserve the Content-Encoding header of the real result, but
1217  * also need to suppress the output of ob_gzhandler to keep to spec
1218  * and avoid breaking Firefox in rare cases where the headers and
1219  * body are broken over two packets.
1220  */
1221 function wfClearOutputBuffers() {
1222         wfResetOutputBuffers( false );
1223 }
1224
1225 /**
1226  * Converts an Accept-* header into an array mapping string values to quality
1227  * factors
1228  */
1229 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
1230         # No arg means accept anything (per HTTP spec)
1231         if( !$accept ) {
1232                 return array( $def => 1 );
1233         }
1234
1235         $prefs = array();
1236
1237         $parts = explode( ',', $accept );
1238
1239         foreach( $parts as $part ) {
1240                 # FIXME: doesn't deal with params like 'text/html; level=1'
1241                 @list( $value, $qpart ) = explode( ';', $part );
1242                 $match = array();
1243                 if( !isset( $qpart ) ) {
1244                         $prefs[$value] = 1;
1245                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
1246                         $prefs[$value] = $match[1];
1247                 }
1248         }
1249
1250         return $prefs;
1251 }
1252
1253 /**
1254  * Checks if a given MIME type matches any of the keys in the given
1255  * array. Basic wildcards are accepted in the array keys.
1256  *
1257  * Returns the matching MIME type (or wildcard) if a match, otherwise
1258  * NULL if no match.
1259  *
1260  * @param string $type
1261  * @param array $avail
1262  * @return string
1263  * @private
1264  */
1265 function mimeTypeMatch( $type, $avail ) {
1266         if( array_key_exists($type, $avail) ) {
1267                 return $type;
1268         } else {
1269                 $parts = explode( '/', $type );
1270                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
1271                         return $parts[0] . '/*';
1272                 } elseif( array_key_exists( '*/*', $avail ) ) {
1273                         return '*/*';
1274                 } else {
1275                         return NULL;
1276                 }
1277         }
1278 }
1279
1280 /**
1281  * Returns the 'best' match between a client's requested internet media types
1282  * and the server's list of available types. Each list should be an associative
1283  * array of type to preference (preference is a float between 0.0 and 1.0).
1284  * Wildcards in the types are acceptable.
1285  *
1286  * @param array $cprefs Client's acceptable type list
1287  * @param array $sprefs Server's offered types
1288  * @return string
1289  *
1290  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
1291  * XXX: generalize to negotiate other stuff
1292  */
1293 function wfNegotiateType( $cprefs, $sprefs ) {
1294         $combine = array();
1295
1296         foreach( array_keys($sprefs) as $type ) {
1297                 $parts = explode( '/', $type );
1298                 if( $parts[1] != '*' ) {
1299                         $ckey = mimeTypeMatch( $type, $cprefs );
1300                         if( $ckey ) {
1301                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1302                         }
1303                 }
1304         }
1305
1306         foreach( array_keys( $cprefs ) as $type ) {
1307                 $parts = explode( '/', $type );
1308                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
1309                         $skey = mimeTypeMatch( $type, $sprefs );
1310                         if( $skey ) {
1311                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1312                         }
1313                 }
1314         }
1315
1316         $bestq = 0;
1317         $besttype = NULL;
1318
1319         foreach( array_keys( $combine ) as $type ) {
1320                 if( $combine[$type] > $bestq ) {
1321                         $besttype = $type;
1322                         $bestq = $combine[$type];
1323                 }
1324         }
1325
1326         return $besttype;
1327 }
1328
1329 /**
1330  * Array lookup
1331  * Returns an array where the values in the first array are replaced by the
1332  * values in the second array with the corresponding keys
1333  *
1334  * @return array
1335  */
1336 function wfArrayLookup( $a, $b ) {
1337         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
1338 }
1339
1340 /**
1341  * Convenience function; returns MediaWiki timestamp for the present time.
1342  * @return string
1343  */
1344 function wfTimestampNow() {
1345         # return NOW
1346         return wfTimestamp( TS_MW, time() );
1347 }
1348
1349 /**
1350  * Reference-counted warning suppression
1351  */
1352 function wfSuppressWarnings( $end = false ) {
1353         static $suppressCount = 0;
1354         static $originalLevel = false;
1355
1356         if ( $end ) {
1357                 if ( $suppressCount ) {
1358                         --$suppressCount;
1359                         if ( !$suppressCount ) {
1360                                 error_reporting( $originalLevel );
1361                         }
1362                 }
1363         } else {
1364                 if ( !$suppressCount ) {
1365                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
1366                 }
1367                 ++$suppressCount;
1368         }
1369 }
1370
1371 /**
1372  * Restore error level to previous value
1373  */
1374 function wfRestoreWarnings() {
1375         wfSuppressWarnings( true );
1376 }
1377
1378 # Autodetect, convert and provide timestamps of various types
1379
1380 /**
1381  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1382  */
1383 define('TS_UNIX', 0);
1384
1385 /**
1386  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1387  */
1388 define('TS_MW', 1);
1389
1390 /**
1391  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1392  */
1393 define('TS_DB', 2);
1394
1395 /**
1396  * RFC 2822 format, for E-mail and HTTP headers
1397  */
1398 define('TS_RFC2822', 3);
1399
1400 /**
1401  * ISO 8601 format with no timezone: 1986-02-09T20:00:00Z
1402  *
1403  * This is used by Special:Export
1404  */
1405 define('TS_ISO_8601', 4);
1406
1407 /**
1408  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1409  *
1410  * @see http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1411  *       DateTime tag and page 36 for the DateTimeOriginal and
1412  *       DateTimeDigitized tags.
1413  */
1414 define('TS_EXIF', 5);
1415
1416 /**
1417  * Oracle format time.
1418  */
1419 define('TS_ORACLE', 6);
1420
1421 /**
1422  * Postgres format time.
1423  */
1424 define('TS_POSTGRES', 7);
1425
1426 /**
1427  * @param mixed $outputtype A timestamp in one of the supported formats, the
1428  *                          function will autodetect which format is supplied
1429  *                          and act accordingly.
1430  * @return string Time in the format specified in $outputtype
1431  */
1432 function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
1433         $uts = 0;
1434         $da = array();
1435         if ($ts==0) {
1436                 $uts=time();
1437         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1438                 # TS_DB
1439                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1440                             (int)$da[2],(int)$da[3],(int)$da[1]);
1441         } elseif (preg_match('/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1442                 # TS_EXIF
1443                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1444                         (int)$da[2],(int)$da[3],(int)$da[1]);
1445         } elseif (preg_match('/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D',$ts,$da)) {
1446                 # TS_MW
1447                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1448                             (int)$da[2],(int)$da[3],(int)$da[1]);
1449         } elseif (preg_match('/^(\d{1,13})$/D',$ts,$da)) {
1450                 # TS_UNIX
1451                 $uts = $ts;
1452         } elseif (preg_match('/^(\d{1,2})-(...)-(\d\d(\d\d)?) (\d\d)\.(\d\d)\.(\d\d)/', $ts, $da)) {
1453                 # TS_ORACLE
1454                 $uts = strtotime(preg_replace('/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
1455                                 str_replace("+00:00", "UTC", $ts)));
1456         } elseif (preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})Z$/', $ts, $da)) {
1457                 # TS_ISO_8601
1458                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1459                         (int)$da[2],(int)$da[3],(int)$da[1]);
1460         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)[\+\- ](\d\d)$/',$ts,$da)) {
1461                 # TS_POSTGRES
1462                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1463                 (int)$da[2],(int)$da[3],(int)$da[1]);
1464         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d) GMT$/',$ts,$da)) {
1465                 # TS_POSTGRES
1466                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1467                 (int)$da[2],(int)$da[3],(int)$da[1]);
1468         } else {
1469                 # Bogus value; fall back to the epoch...
1470                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1471                 $uts = 0;
1472         }
1473
1474
1475         switch($outputtype) {
1476                 case TS_UNIX:
1477                         return $uts;
1478                 case TS_MW:
1479                         return gmdate( 'YmdHis', $uts );
1480                 case TS_DB:
1481                         return gmdate( 'Y-m-d H:i:s', $uts );
1482                 case TS_ISO_8601:
1483                         return gmdate( 'Y-m-d\TH:i:s\Z', $uts );
1484                 // This shouldn't ever be used, but is included for completeness
1485                 case TS_EXIF:
1486                         return gmdate(  'Y:m:d H:i:s', $uts );
1487                 case TS_RFC2822:
1488                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1489                 case TS_ORACLE:
1490                         return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
1491                 case TS_POSTGRES:
1492                         return gmdate( 'Y-m-d H:i:s', $uts) . ' GMT';
1493                 default:
1494                         throw new MWException( 'wfTimestamp() called with illegal output type.');
1495         }
1496 }
1497
1498 /**
1499  * Return a formatted timestamp, or null if input is null.
1500  * For dealing with nullable timestamp columns in the database.
1501  * @param int $outputtype
1502  * @param string $ts
1503  * @return string
1504  */
1505 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1506         if( is_null( $ts ) ) {
1507                 return null;
1508         } else {
1509                 return wfTimestamp( $outputtype, $ts );
1510         }
1511 }
1512
1513 /**
1514  * Check if the operating system is Windows
1515  *
1516  * @return bool True if it's Windows, False otherwise.
1517  */
1518 function wfIsWindows() {
1519         if (substr(php_uname(), 0, 7) == 'Windows') {
1520                 return true;
1521         } else {
1522                 return false;
1523         }
1524 }
1525
1526 /**
1527  * Swap two variables
1528  */
1529 function swap( &$x, &$y ) {
1530         $z = $x;
1531         $x = $y;
1532         $y = $z;
1533 }
1534
1535 function wfGetCachedNotice( $name ) {
1536         global $wgOut, $parserMemc;
1537         $fname = 'wfGetCachedNotice';
1538         wfProfileIn( $fname );
1539
1540         $needParse = false;
1541
1542         if( $name === 'default' ) {
1543                 // special case
1544                 global $wgSiteNotice;
1545                 $notice = $wgSiteNotice;
1546                 if( empty( $notice ) ) {
1547                         wfProfileOut( $fname );
1548                         return false;
1549                 }
1550         } else {
1551                 $notice = wfMsgForContentNoTrans( $name );
1552                 if( wfEmptyMsg( $name, $notice ) || $notice == '-' ) {
1553                         wfProfileOut( $fname );
1554                         return( false );
1555                 }
1556         }
1557
1558         $cachedNotice = $parserMemc->get( wfMemcKey( $name ) );
1559         if( is_array( $cachedNotice ) ) {
1560                 if( md5( $notice ) == $cachedNotice['hash'] ) {
1561                         $notice = $cachedNotice['html'];
1562                 } else {
1563                         $needParse = true;
1564                 }
1565         } else {
1566                 $needParse = true;
1567         }
1568
1569         if( $needParse ) {
1570                 if( is_object( $wgOut ) ) {
1571                         $parsed = $wgOut->parse( $notice );
1572                         $parserMemc->set( wfMemcKey( $name ), array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1573                         $notice = $parsed;
1574                 } else {
1575                         wfDebug( 'wfGetCachedNotice called for ' . $name . ' with no $wgOut available' );
1576                         $notice = '';
1577                 }
1578         }
1579
1580         wfProfileOut( $fname );
1581         return $notice;
1582 }
1583
1584 function wfGetNamespaceNotice() {
1585         global $wgTitle;
1586
1587         # Paranoia
1588         if ( !isset( $wgTitle ) || !is_object( $wgTitle ) )
1589                 return "";
1590
1591         $fname = 'wfGetNamespaceNotice';
1592         wfProfileIn( $fname );
1593
1594         $key = "namespacenotice-" . $wgTitle->getNsText();
1595         $namespaceNotice = wfGetCachedNotice( $key );
1596         if ( $namespaceNotice && substr ( $namespaceNotice , 0 ,7 ) != "<p>&lt;" ) {
1597                  $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . "</div>";
1598         } else {
1599                 $namespaceNotice = "";
1600         }
1601
1602         wfProfileOut( $fname );
1603         return $namespaceNotice;
1604 }
1605
1606 function wfGetSiteNotice() {
1607         global $wgUser, $wgSiteNotice;
1608         $fname = 'wfGetSiteNotice';
1609         wfProfileIn( $fname );
1610         $siteNotice = '';
1611
1612         if( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice ) ) ) {
1613                 if( is_object( $wgUser ) && $wgUser->isLoggedIn() ) {
1614                         $siteNotice = wfGetCachedNotice( 'sitenotice' );
1615                 } else {
1616                         $anonNotice = wfGetCachedNotice( 'anonnotice' );
1617                         if( !$anonNotice ) {
1618                                 $siteNotice = wfGetCachedNotice( 'sitenotice' );
1619                         } else {
1620                                 $siteNotice = $anonNotice;
1621                         }
1622                 }
1623                 if( !$siteNotice ) {
1624                         $siteNotice = wfGetCachedNotice( 'default' );
1625                 }
1626         }
1627
1628         wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice ) );
1629         wfProfileOut( $fname );
1630         return $siteNotice;
1631 }
1632
1633 /**
1634  * BC wrapper for MimeMagic::singleton()
1635  * @deprecated
1636  */
1637 function &wfGetMimeMagic() {
1638         return MimeMagic::singleton();
1639 }
1640
1641 /**
1642  * Tries to get the system directory for temporary files.
1643  * The TMPDIR, TMP, and TEMP environment variables are checked in sequence,
1644  * and if none are set /tmp is returned as the generic Unix default.
1645  *
1646  * NOTE: When possible, use the tempfile() function to create temporary
1647  * files to avoid race conditions on file creation, etc.
1648  *
1649  * @return string
1650  */
1651 function wfTempDir() {
1652         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
1653                 $tmp = getenv( $var );
1654                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
1655                         return $tmp;
1656                 }
1657         }
1658         # Hope this is Unix of some kind!
1659         return '/tmp';
1660 }
1661
1662 /**
1663  * Make directory, and make all parent directories if they don't exist
1664  */
1665 function wfMkdirParents( $fullDir, $mode = 0777 ) {
1666         if ( strval( $fullDir ) === '' ) {
1667                 return true;
1668         }
1669
1670         # Go back through the paths to find the first directory that exists
1671         $currentDir = $fullDir;
1672         $createList = array();
1673         while ( strval( $currentDir ) !== '' && !file_exists( $currentDir ) ) {
1674                 # Strip trailing slashes
1675                 $currentDir = rtrim( $currentDir, '/\\' );
1676
1677                 # Add to create list
1678                 $createList[] = $currentDir;
1679
1680                 # Find next delimiter searching from the end
1681                 $p = max( strrpos( $currentDir, '/' ), strrpos( $currentDir, '\\' ) );
1682                 if ( $p === false ) {
1683                         $currentDir = false;
1684                 } else {
1685                         $currentDir = substr( $currentDir, 0, $p );
1686                 }
1687         }
1688
1689         if ( count( $createList ) == 0 ) {
1690                 # Directory specified already exists
1691                 return true;
1692         } elseif ( $currentDir === false ) {
1693                 # Went all the way back to root and it apparently doesn't exist
1694                 return false;
1695         }
1696
1697         # Now go forward creating directories
1698         $createList = array_reverse( $createList );
1699         foreach ( $createList as $dir ) {
1700                 # use chmod to override the umask, as suggested by the PHP manual
1701                 if ( !mkdir( $dir, $mode ) || !chmod( $dir, $mode ) ) {
1702                         wfDebugLog( 'mkdir', "Unable to create directory $dir\n" );
1703                         return false;
1704                 }
1705         }
1706         return true;
1707 }
1708
1709 /**
1710  * Increment a statistics counter
1711  */
1712  function wfIncrStats( $key ) {
1713          global $wgMemc;
1714          $key = wfMemcKey( 'stats', $key );
1715          if ( is_null( $wgMemc->incr( $key ) ) ) {
1716                  $wgMemc->add( $key, 1 );
1717          }
1718  }
1719
1720 /**
1721  * @param mixed $nr The number to format
1722  * @param int $acc The number of digits after the decimal point, default 2
1723  * @param bool $round Whether or not to round the value, default true
1724  * @return float
1725  */
1726 function wfPercent( $nr, $acc = 2, $round = true ) {
1727         $ret = sprintf( "%.${acc}f", $nr );
1728         return $round ? round( $ret, $acc ) . '%' : "$ret%";
1729 }
1730
1731 /**
1732  * Encrypt a username/password.
1733  *
1734  * @param string $userid ID of the user
1735  * @param string $password Password of the user
1736  * @return string Hashed password
1737  */
1738 function wfEncryptPassword( $userid, $password ) {
1739         global $wgPasswordSalt;
1740         $p = md5( $password);
1741
1742         if($wgPasswordSalt)
1743                 return md5( "{$userid}-{$p}" );
1744         else
1745                 return $p;
1746 }
1747
1748 /**
1749  * Appends to second array if $value differs from that in $default
1750  */
1751 function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
1752         if ( is_null( $changed ) ) {
1753                 throw new MWException('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
1754         }
1755         if ( $default[$key] !== $value ) {
1756                 $changed[$key] = $value;
1757         }
1758 }
1759
1760 /**
1761  * Since wfMsg() and co suck, they don't return false if the message key they
1762  * looked up didn't exist but a XHTML string, this function checks for the
1763  * nonexistance of messages by looking at wfMsg() output
1764  *
1765  * @param $msg      The message key looked up
1766  * @param $wfMsgOut The output of wfMsg*()
1767  * @return bool
1768  */
1769 function wfEmptyMsg( $msg, $wfMsgOut ) {
1770         return $wfMsgOut === "&lt;$msg&gt;";
1771 }
1772
1773 /**
1774  * Find out whether or not a mixed variable exists in a string
1775  *
1776  * @param mixed  needle
1777  * @param string haystack
1778  * @return bool
1779  */
1780 function in_string( $needle, $str ) {
1781         return strpos( $str, $needle ) !== false;
1782 }
1783
1784 function wfSpecialList( $page, $details ) {
1785         global $wgContLang;
1786         $details = $details ? ' ' . $wgContLang->getDirMark() . "($details)" : "";
1787         return $page . $details;
1788 }
1789
1790 /**
1791  * Returns a regular expression of url protocols
1792  *
1793  * @return string
1794  */
1795 function wfUrlProtocols() {
1796         global $wgUrlProtocols;
1797
1798         // Support old-style $wgUrlProtocols strings, for backwards compatibility
1799         // with LocalSettings files from 1.5
1800         if ( is_array( $wgUrlProtocols ) ) {
1801                 $protocols = array();
1802                 foreach ($wgUrlProtocols as $protocol)
1803                         $protocols[] = preg_quote( $protocol, '/' );
1804
1805                 return implode( '|', $protocols );
1806         } else {
1807                 return $wgUrlProtocols;
1808         }
1809 }
1810
1811 /**
1812  * Execute a shell command, with time and memory limits mirrored from the PHP
1813  * configuration if supported.
1814  * @param $cmd Command line, properly escaped for shell.
1815  * @param &$retval optional, will receive the program's exit code.
1816  *                 (non-zero is usually failure)
1817  * @return collected stdout as a string (trailing newlines stripped)
1818  */
1819 function wfShellExec( $cmd, &$retval=null ) {
1820         global $IP, $wgMaxShellMemory, $wgMaxShellFileSize;
1821
1822         if( ini_get( 'safe_mode' ) ) {
1823                 wfDebug( "wfShellExec can't run in safe_mode, PHP's exec functions are too broken.\n" );
1824                 $retval = 1;
1825                 return "Unable to run external programs in safe mode.";
1826         }
1827
1828         if ( php_uname( 's' ) == 'Linux' ) {
1829                 $time = intval( ini_get( 'max_execution_time' ) );
1830                 $mem = intval( $wgMaxShellMemory );
1831                 $filesize = intval( $wgMaxShellFileSize );
1832
1833                 if ( $time > 0 && $mem > 0 ) {
1834                         $script = "$IP/bin/ulimit4.sh";
1835                         if ( is_executable( $script ) ) {
1836                                 $cmd = escapeshellarg( $script ) . " $time $mem $filesize " . escapeshellarg( $cmd );
1837                         }
1838                 }
1839         } elseif ( php_uname( 's' ) == 'Windows NT' ) {
1840                 # This is a hack to work around PHP's flawed invocation of cmd.exe
1841                 # http://news.php.net/php.internals/21796
1842                 $cmd = '"' . $cmd . '"';
1843         }
1844         wfDebug( "wfShellExec: $cmd\n" );
1845
1846         $output = array();
1847         $retval = 1; // error by default?
1848         exec( $cmd, $output, $retval ); // returns the last line of output.
1849         return implode( "\n", $output );
1850
1851 }
1852
1853 /**
1854  * This function works like "use VERSION" in Perl, the program will die with a
1855  * backtrace if the current version of PHP is less than the version provided
1856  *
1857  * This is useful for extensions which due to their nature are not kept in sync
1858  * with releases, and might depend on other versions of PHP than the main code
1859  *
1860  * Note: PHP might die due to parsing errors in some cases before it ever
1861  *       manages to call this function, such is life
1862  *
1863  * @see perldoc -f use
1864  *
1865  * @param mixed $version The version to check, can be a string, an integer, or
1866  *                       a float
1867  */
1868 function wfUsePHP( $req_ver ) {
1869         $php_ver = PHP_VERSION;
1870
1871         if ( version_compare( $php_ver, (string)$req_ver, '<' ) )
1872                  throw new MWException( "PHP $req_ver required--this is only $php_ver" );
1873 }
1874
1875 /**
1876  * This function works like "use VERSION" in Perl except it checks the version
1877  * of MediaWiki, the program will die with a backtrace if the current version
1878  * of MediaWiki is less than the version provided.
1879  *
1880  * This is useful for extensions which due to their nature are not kept in sync
1881  * with releases
1882  *
1883  * @see perldoc -f use
1884  *
1885  * @param mixed $version The version to check, can be a string, an integer, or
1886  *                       a float
1887  */
1888 function wfUseMW( $req_ver ) {
1889         global $wgVersion;
1890
1891         if ( version_compare( $wgVersion, (string)$req_ver, '<' ) )
1892                 throw new MWException( "MediaWiki $req_ver required--this is only $wgVersion" );
1893 }
1894
1895 /**
1896  * @deprecated use StringUtils::escapeRegexReplacement
1897  */
1898 function wfRegexReplacement( $string ) {
1899         return StringUtils::escapeRegexReplacement( $string );
1900 }
1901
1902 /**
1903  * Return the final portion of a pathname.
1904  * Reimplemented because PHP5's basename() is buggy with multibyte text.
1905  * http://bugs.php.net/bug.php?id=33898
1906  *
1907  * PHP's basename() only considers '\' a pathchar on Windows and Netware.
1908  * We'll consider it so always, as we don't want \s in our Unix paths either.
1909  *
1910  * @param string $path
1911  * @return string
1912  */
1913 function wfBaseName( $path ) {
1914         $matches = array();
1915         if( preg_match( '#([^/\\\\]*)[/\\\\]*$#', $path, $matches ) ) {
1916                 return $matches[1];
1917         } else {
1918                 return '';
1919         }
1920 }
1921
1922 /**
1923  * Generate a relative path name to the given file.
1924  * May explode on non-matching case-insensitive paths,
1925  * funky symlinks, etc.
1926  *
1927  * @param string $path Absolute destination path including target filename
1928  * @param string $from Absolute source path, directory only
1929  * @return string
1930  */
1931 function wfRelativePath( $path, $from ) {
1932         // Normalize mixed input on Windows...
1933         $path = str_replace( '/', DIRECTORY_SEPARATOR, $path );
1934         $from = str_replace( '/', DIRECTORY_SEPARATOR, $from );
1935
1936         $pieces  = explode( DIRECTORY_SEPARATOR, dirname( $path ) );
1937         $against = explode( DIRECTORY_SEPARATOR, $from );
1938
1939         // Trim off common prefix
1940         while( count( $pieces ) && count( $against )
1941                 && $pieces[0] == $against[0] ) {
1942                 array_shift( $pieces );
1943                 array_shift( $against );
1944         }
1945
1946         // relative dots to bump us to the parent
1947         while( count( $against ) ) {
1948                 array_unshift( $pieces, '..' );
1949                 array_shift( $against );
1950         }
1951
1952         array_push( $pieces, wfBaseName( $path ) );
1953
1954         return implode( DIRECTORY_SEPARATOR, $pieces );
1955 }
1956
1957 /**
1958  * Make a URL index, appropriate for the el_index field of externallinks.
1959  */
1960 function wfMakeUrlIndex( $url ) {
1961         global $wgUrlProtocols; // Allow all protocols defined in DefaultSettings/LocalSettings.php
1962         $bits = parse_url( $url );
1963         wfSuppressWarnings();
1964         wfRestoreWarnings();
1965         if ( !$bits ) {
1966                 return false;
1967         }
1968         // most of the protocols are followed by ://, but mailto: and sometimes news: not, check for it
1969         $delimiter = '';
1970         if ( in_array( $bits['scheme'] . '://' , $wgUrlProtocols ) ) {
1971                 $delimiter = '://';
1972         } elseif ( in_array( $bits['scheme'] .':' , $wgUrlProtocols ) ) {
1973                 $delimiter = ':';
1974                 // parse_url detects for news: and mailto: the host part of an url as path
1975                 // We have to correct this wrong detection
1976                 if ( isset ( $bits['path'] ) ) {
1977                         $bits['host'] = $bits['path'];
1978                         $bits['path'] = '';
1979                 }
1980         } else {
1981                 return false;
1982         }
1983
1984         // Reverse the labels in the hostname, convert to lower case
1985         // For emails reverse domainpart only
1986         if ( $bits['scheme'] == 'mailto' ) {
1987                 $mailparts = explode( '@', $bits['host'] );
1988                 $domainpart = strtolower( implode( '.', array_reverse( explode( '.', $mailparts[1] ) ) ) );
1989                 $reversedHost = $domainpart . '@' . $mailparts[0];
1990         } else {
1991                 $reversedHost = strtolower( implode( '.', array_reverse( explode( '.', $bits['host'] ) ) ) );
1992         }
1993         // Add an extra dot to the end
1994         if ( substr( $reversedHost, -1, 1 ) !== '.' ) {
1995                 $reversedHost .= '.';
1996         }
1997         // Reconstruct the pseudo-URL
1998         $prot = $bits['scheme'];
1999         $index = "$prot$delimiter$reversedHost";
2000         // Leave out user and password. Add the port, path, query and fragment
2001         if ( isset( $bits['port'] ) )      $index .= ':' . $bits['port'];
2002         if ( isset( $bits['path'] ) ) {
2003                 $index .= $bits['path'];
2004         } else {
2005                 $index .= '/';
2006         }
2007         if ( isset( $bits['query'] ) )     $index .= '?' . $bits['query'];
2008         if ( isset( $bits['fragment'] ) )  $index .= '#' . $bits['fragment'];
2009         return $index;
2010 }
2011
2012 /**
2013  * Do any deferred updates and clear the list
2014  * TODO: This could be in Wiki.php if that class made any sense at all
2015  */
2016 function wfDoUpdates()
2017 {
2018         global $wgPostCommitUpdateList, $wgDeferredUpdateList;
2019         foreach ( $wgDeferredUpdateList as $update ) {
2020                 $update->doUpdate();
2021         }
2022         foreach ( $wgPostCommitUpdateList as $update ) {
2023                 $update->doUpdate();
2024         }
2025         $wgDeferredUpdateList = array();
2026         $wgPostCommitUpdateList = array();
2027 }
2028
2029 /**
2030  * @deprecated use StringUtils::explodeMarkup
2031  */
2032 function wfExplodeMarkup( $separator, $text ) {
2033         return StringUtils::explodeMarkup( $separator, $text );
2034 }
2035
2036 /**
2037  * Convert an arbitrarily-long digit string from one numeric base
2038  * to another, optionally zero-padding to a minimum column width.
2039  *
2040  * Supports base 2 through 36; digit values 10-36 are represented
2041  * as lowercase letters a-z. Input is case-insensitive.
2042  *
2043  * @param $input string of digits
2044  * @param $sourceBase int 2-36
2045  * @param $destBase int 2-36
2046  * @param $pad int 1 or greater
2047  * @param $lowercase bool
2048  * @return string or false on invalid input
2049  */
2050 function wfBaseConvert( $input, $sourceBase, $destBase, $pad=1, $lowercase=true ) {
2051         $input = strval( $input );
2052         if( $sourceBase < 2 ||
2053                 $sourceBase > 36 ||
2054                 $destBase < 2 ||
2055                 $destBase > 36 ||
2056                 $pad < 1 ||
2057                 $sourceBase != intval( $sourceBase ) ||
2058                 $destBase != intval( $destBase ) ||
2059                 $pad != intval( $pad ) ||
2060                 !is_string( $input ) ||
2061                 $input == '' ) {
2062                 return false;
2063         }
2064         $digitChars = ( $lowercase ) ?  '0123456789abcdefghijklmnopqrstuvwxyz' : '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
2065         $inDigits = array();
2066         $outChars = '';
2067
2068         // Decode and validate input string
2069         $input = strtolower( $input );
2070         for( $i = 0; $i < strlen( $input ); $i++ ) {
2071                 $n = strpos( $digitChars, $input{$i} );
2072                 if( $n === false || $n > $sourceBase ) {
2073                         return false;
2074                 }
2075                 $inDigits[] = $n;
2076         }
2077
2078         // Iterate over the input, modulo-ing out an output digit
2079         // at a time until input is gone.
2080         while( count( $inDigits ) ) {
2081                 $work = 0;
2082                 $workDigits = array();
2083
2084                 // Long division...
2085                 foreach( $inDigits as $digit ) {
2086                         $work *= $sourceBase;
2087                         $work += $digit;
2088
2089                         if( $work < $destBase ) {
2090                                 // Gonna need to pull another digit.
2091                                 if( count( $workDigits ) ) {
2092                                         // Avoid zero-padding; this lets us find
2093                                         // the end of the input very easily when
2094                                         // length drops to zero.
2095                                         $workDigits[] = 0;
2096                                 }
2097                         } else {
2098                                 // Finally! Actual division!
2099                                 $workDigits[] = intval( $work / $destBase );
2100
2101                                 // Isn't it annoying that most programming languages
2102                                 // don't have a single divide-and-remainder operator,
2103                                 // even though the CPU implements it that way?
2104                                 $work = $work % $destBase;
2105                         }
2106                 }
2107
2108                 // All that division leaves us with a remainder,
2109                 // which is conveniently our next output digit.
2110                 $outChars .= $digitChars[$work];
2111
2112                 // And we continue!
2113                 $inDigits = $workDigits;
2114         }
2115
2116         while( strlen( $outChars ) < $pad ) {
2117                 $outChars .= '0';
2118         }
2119
2120         return strrev( $outChars );
2121 }
2122
2123 /**
2124  * Create an object with a given name and an array of construct parameters
2125  * @param string $name
2126  * @param array $p parameters
2127  */
2128 function wfCreateObject( $name, $p ){
2129         $p = array_values( $p );
2130         switch ( count( $p ) ) {
2131                 case 0:
2132                         return new $name;
2133                 case 1:
2134                         return new $name( $p[0] );
2135                 case 2:
2136                         return new $name( $p[0], $p[1] );
2137                 case 3:
2138                         return new $name( $p[0], $p[1], $p[2] );
2139                 case 4:
2140                         return new $name( $p[0], $p[1], $p[2], $p[3] );
2141                 case 5:
2142                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4] );
2143                 case 6:
2144                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4], $p[5] );
2145                 default:
2146                         throw new MWException( "Too many arguments to construtor in wfCreateObject" );
2147         }
2148 }
2149
2150 /**
2151  * Aliases for modularized functions
2152  */
2153 function wfGetHTTP( $url, $timeout = 'default' ) {
2154         return Http::get( $url, $timeout );
2155 }
2156 function wfIsLocalURL( $url ) {
2157         return Http::isLocalURL( $url );
2158 }
2159
2160 /**
2161  * Initialise php session
2162  */
2163 function wfSetupSession() {
2164         global $wgSessionsInMemcached, $wgCookiePath, $wgCookieDomain, $wgCookieSecure;
2165         if( $wgSessionsInMemcached ) {
2166                 require_once( 'MemcachedSessions.php' );
2167         } elseif( 'files' != ini_get( 'session.save_handler' ) ) {
2168                 # If it's left on 'user' or another setting from another
2169                 # application, it will end up failing. Try to recover.
2170                 ini_set ( 'session.save_handler', 'files' );
2171         }
2172         session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure);
2173         session_cache_limiter( 'private, must-revalidate' );
2174         @session_start();
2175 }
2176
2177 /**
2178  * Get an object from the precompiled serialized directory
2179  *
2180  * @return mixed The variable on success, false on failure
2181  */
2182 function wfGetPrecompiledData( $name ) {
2183         global $IP;
2184
2185         $file = "$IP/serialized/$name";
2186         if ( file_exists( $file ) ) {
2187                 $blob = file_get_contents( $file );
2188                 if ( $blob ) {
2189                         return unserialize( $blob );
2190                 }
2191         }
2192         return false;
2193 }
2194
2195 function wfGetCaller( $level = 2 ) {
2196         $backtrace = wfDebugBacktrace();
2197         if ( isset( $backtrace[$level] ) ) {
2198                 if ( isset( $backtrace[$level]['class'] ) ) {
2199                         $caller = $backtrace[$level]['class'] . '::' . $backtrace[$level]['function'];
2200                 } else {
2201                         $caller = $backtrace[$level]['function'];
2202                 }
2203         } else {
2204                 $caller = 'unknown';
2205         }
2206         return $caller;
2207 }
2208
2209 /** Return a string consisting all callers in stack, somewhat useful sometimes for profiling specific points */
2210 function wfGetAllCallers() {
2211         return implode('/', array_map(
2212                 create_function('$frame','
2213                         return isset( $frame["class"] )?
2214                                 $frame["class"]."::".$frame["function"]:
2215                                 $frame["function"];
2216                         '),
2217                 array_reverse(wfDebugBacktrace())));
2218 }
2219
2220 /**
2221  * Get a cache key
2222  */
2223 function wfMemcKey( /*... */ ) {
2224         global $wgDBprefix, $wgDBname;
2225         $args = func_get_args();
2226         if ( $wgDBprefix ) {
2227                 $key = "$wgDBname-$wgDBprefix:" . implode( ':', $args );
2228         } else {
2229                 $key = $wgDBname . ':' . implode( ':', $args );
2230         }
2231         return $key;
2232 }
2233
2234 /**
2235  * Get a cache key for a foreign DB
2236  */
2237 function wfForeignMemcKey( $db, $prefix /*, ... */ ) {
2238         $args = array_slice( func_get_args(), 2 );
2239         if ( $prefix ) {
2240                 $key = "$db-$prefix:" . implode( ':', $args );
2241         } else {
2242                 $key = $db . ':' . implode( ':', $args );
2243         }
2244         return $key;
2245 }
2246
2247 /**
2248  * Get an ASCII string identifying this wiki
2249  * This is used as a prefix in memcached keys
2250  */
2251 function wfWikiID() {
2252         global $wgDBprefix, $wgDBname;
2253         if ( $wgDBprefix ) {
2254                 return "$wgDBname-$wgDBprefix";
2255         } else {
2256                 return $wgDBname;
2257         }
2258 }
2259
2260 /*
2261  * Get a Database object
2262  * @param integer $db Index of the connection to get. May be DB_MASTER for the
2263  *                master (for write queries), DB_SLAVE for potentially lagged
2264  *                read queries, or an integer >= 0 for a particular server.
2265  *
2266  * @param mixed $groups Query groups. An array of group names that this query
2267  *              belongs to. May contain a single string if the query is only
2268  *              in one group.
2269  */
2270 function &wfGetDB( $db = DB_LAST, $groups = array() ) {
2271         global $wgLoadBalancer;
2272         $ret = $wgLoadBalancer->getConnection( $db, true, $groups );
2273         return $ret;
2274 }
2275
2276 /**
2277  * Find a file.
2278  * Shortcut for RepoGroup::singleton()->findFile()
2279  * @param mixed $title Title object or string. May be interwiki.
2280  * @param mixed $time Requested time for an archived image, or false for the
2281  *                    current version. An image object will be returned which
2282  *                    existed at or before the specified time.
2283  * @return File, or false if the file does not exist
2284  */
2285 function wfFindFile( $title, $time = false ) {
2286         return RepoGroup::singleton()->findFile( $title, $time );
2287 }
2288
2289 /**
2290  * Get an object referring to a locally registered file.
2291  * Returns a valid placeholder object if the file does not exist.
2292  */
2293 function wfLocalFile( $title ) {
2294         return RepoGroup::singleton()->getLocalRepo()->newFile( $title );
2295 }
2296
2297 ?>