includes/GlobalFunctions.php

   1 <?php
   2
   3 /**
   4  * Global functions used everywhere
   5  * @package MediaWiki
   6  */
   7
   8 /**
   9  * Some globals and requires needed
  10  */
  11
  12 /**
  13  * Total number of articles
  14  * @global integer $wgNumberOfArticles
  15  */
  16 $wgNumberOfArticles = -1; # Unset
  17 /**
  18  * Total number of views
  19  * @global integer $wgTotalViews
  20  */
  21 $wgTotalViews = -1;
  22 /**
  23  * Total number of edits
  24  * @global integer $wgTotalEdits
  25  */
  26 $wgTotalEdits = -1;
  27
  28
  29 require_once( 'DatabaseFunctions.php' );
  30 require_once( 'UpdateClasses.php' );
  31 require_once( 'LogPage.php' );
  32 require_once( 'normal/UtfNormalUtil.php' );
  33
  34 /**
  35  * Compatibility functions
  36  * PHP <4.3.x is not actively supported; 4.1.x and 4.2.x might or might not work.
  37  * <4.1.x will not work, as we use a number of features introduced in 4.1.0
  38  * such as the new autoglobals.
  39  */
  40 if( !function_exists('iconv') ) {
  41         # iconv support is not in the default configuration and so may not be present.
  42         # Assume will only ever use utf-8 and iso-8859-1.
  43         # This will *not* work in all circumstances.
  44         function iconv( $from, $to, $string ) {
  45                 if(strcasecmp( $from, $to ) == 0) return $string;
  46                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  47                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  48                 return $string;
  49         }
  50 }
  51
  52 if( !function_exists('file_get_contents') ) {
  53         # Exists in PHP 4.3.0+
  54         function file_get_contents( $filename ) {
  55                 return implode( '', file( $filename ) );
  56         }
  57 }
  58
  59 if( !function_exists('is_a') ) {
  60         # Exists in PHP 4.2.0+
  61         function is_a( $object, $class_name ) {
  62                 return
  63                         (strcasecmp( get_class( $object ), $class_name ) == 0) ||
  64                          is_subclass_of( $object, $class_name );
  65         }
  66 }
  67
  68 # UTF-8 substr function based on a PHP manual comment
  69 if ( !function_exists( 'mb_substr' ) ) {
  70         function mb_substr( $str, $start ) {
  71                 preg_match_all( '/./us', $str, $ar );
  72
  73                 if( func_num_args() >= 3 ) {
  74                         $end = func_get_arg( 2 );
  75                         return join( '', array_slice( $ar[0], $start, $end ) );
  76                 } else {
  77                         return join( '', array_slice( $ar[0], $start ) );
  78                 }
  79         }
  80 }
  81
  82 if( !function_exists( 'floatval' ) ) {
  83         /**
  84          * First defined in PHP 4.2.0
  85          * @param mixed $var;
  86          * @return float
  87          */
  88         function floatval( $var ) {
  89                 return (float)$var;
  90         }
  91 }
  92
  93 if ( !function_exists( 'array_diff_key' ) ) {
  94         /**
  95          * Exists in PHP 5.1.0+
  96          * Not quite compatible, two-argument version only
  97          * Null values will cause problems due to this use of isset()
  98          */
  99         function array_diff_key( $left, $right ) {
 100                 $result = $left;
 101                 foreach ( $left as $key => $value ) {
 102                         if ( isset( $right[$key] ) ) {
 103                                 unset( $result[$key] );
 104                         }
 105                 }
 106                 return $result;
 107         }
 108 }
 109
 110 // If it doesn't exist no ctype_* stuff will
 111 if ( ! function_exists( 'ctype_alnum' ) )
 112         require_once 'compatability/ctype.php';
 113
 114 /**
 115  * Wrapper for clone() for PHP 4, for the moment.
 116  * PHP 5 won't let you declare a 'clone' function, even conditionally,
 117  * so it has to be a wrapper with a different name.
 118  */
 119 function wfClone( $object ) {
 120         // WARNING: clone() is not a function in PHP 5, so function_exists fails.
 121         if( version_compare( PHP_VERSION, '5.0' ) < 0 ) {
 122                 return $object;
 123         } else {
 124                 return clone( $object );
 125         }
 126 }
 127
 128 /**
 129  * Where as we got a random seed
 130  * @var bool $wgTotalViews
 131  */
 132 $wgRandomSeeded = false;
 133
 134 /**
 135  * Seed Mersenne Twister
 136  * Only necessary in PHP < 4.2.0
 137  *
 138  * @return bool
 139  */
 140 function wfSeedRandom() {
 141         global $wgRandomSeeded;
 142
 143         if ( ! $wgRandomSeeded && version_compare( phpversion(), '4.2.0' ) < 0 ) {
 144                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
 145                 mt_srand( $seed );
 146                 $wgRandomSeeded = true;
 147         }
 148 }
 149
 150 /**
 151  * Get a random decimal value between 0 and 1, in a way
 152  * not likely to give duplicate values for any realistic
 153  * number of articles.
 154  *
 155  * @return string
 156  */
 157 function wfRandom() {
 158         # The maximum random value is "only" 2^31-1, so get two random
 159         # values to reduce the chance of dupes
 160         $max = mt_getrandmax();
 161         $rand = number_format( (mt_rand() * $max + mt_rand())
 162                 / $max / $max, 12, '.', '' );
 163         return $rand;
 164 }
 165
 166 /**
 167  * We want / and : to be included as literal characters in our title URLs.
 168  * %2F in the page titles seems to fatally break for some reason.
 169  *
 170  * @param string $s
 171  * @return string
 172 */
 173 function wfUrlencode ( $s ) {
 174         $s = urlencode( $s );
 175         $s = preg_replace( '/%3[Aa]/', ':', $s );
 176         $s = preg_replace( '/%2[Ff]/', '/', $s );
 177
 178         return $s;
 179 }
 180
 181 /**
 182  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 183  * In normal operation this is a NOP.
 184  *
 185  * Controlling globals:
 186  * $wgDebugLogFile - points to the log file
 187  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 188  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 189  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 190  *
 191  * @param string $text
 192  * @param bool $logonly Set true to avoid appearing in HTML when $wgDebugComments is set
 193  */
 194 function wfDebug( $text, $logonly = false ) {
 195         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 196
 197         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 198         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 199                 return;
 200         }
 201
 202         if ( isset( $wgOut ) && $wgDebugComments && !$logonly ) {
 203                 $wgOut->debug( $text );
 204         }
 205         if ( '' != $wgDebugLogFile && !$wgProfileOnly ) {
 206                 # Strip unprintables; they can switch terminal modes when binary data
 207                 # gets dumped, which is pretty annoying.
 208                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 209                 @error_log( $text, 3, $wgDebugLogFile );
 210         }
 211 }
 212
 213 /**
 214  * Send a line to a supplementary debug log file, if configured, or main debug log if not.
 215  * $wgDebugLogGroups[$logGroup] should be set to a filename to send to a separate log.
 216  *
 217  * @param string $logGroup
 218  * @param string $text
 219  * @param bool $public Whether to log the event in the public log if no private
 220  *                     log file is specified, (default true)
 221  */
 222 function wfDebugLog( $logGroup, $text, $public = true ) {
 223         global $wgDebugLogGroups, $wgDBname;
 224         if( $text{strlen( $text ) - 1} != "\n" ) $text .= "\n";
 225         if( isset( $wgDebugLogGroups[$logGroup] ) ) {
 226                 @error_log( "$wgDBname: $text", 3, $wgDebugLogGroups[$logGroup] );
 227         } else if ( $public === true ) {
 228                 wfDebug( $text, true );
 229         }
 230 }
 231
 232 /**
 233  * Log for database errors
 234  * @param string $text Database error message.
 235  */
 236 function wfLogDBError( $text ) {
 237         global $wgDBerrorLog;
 238         if ( $wgDBerrorLog ) {
 239                 $host = trim(`hostname`);
 240                 $text = date('D M j G:i:s T Y') . "\t$host\t".$text;
 241                 error_log( $text, 3, $wgDBerrorLog );
 242         }
 243 }
 244
 245 /**
 246  * @todo document
 247  */
 248 function logProfilingData() {
 249         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 250         global $wgProfiling, $wgUser;
 251         $now = wfTime();
 252
 253         list( $usec, $sec ) = explode( ' ', $wgRequestTime );
 254         $start = (float)$sec + (float)$usec;
 255         $elapsed = $now - $start;
 256         if ( $wgProfiling ) {
 257                 $prof = wfGetProfilingOutput( $start, $elapsed );
 258                 $forward = '';
 259                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 260                         $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 261                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 262                         $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 263                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 264                         $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 265                 if( $forward )
 266                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 267                 if( is_object($wgUser) && $wgUser->isAnon() )
 268                         $forward .= ' anon';
 269                 $log = sprintf( "%s\t%04.3f\t%s\n",
 270                   gmdate( 'YmdHis' ), $elapsed,
 271                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 272                 if ( '' != $wgDebugLogFile && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 273                         error_log( $log . $prof, 3, $wgDebugLogFile );
 274                 }
 275         }
 276 }
 277
 278 /**
 279  * Check if the wiki read-only lock file is present. This can be used to lock
 280  * off editing functions, but doesn't guarantee that the database will not be
 281  * modified.
 282  * @return bool
 283  */
 284 function wfReadOnly() {
 285         global $wgReadOnlyFile, $wgReadOnly;
 286
 287         if ( $wgReadOnly ) {
 288                 return true;
 289         }
 290         if ( '' == $wgReadOnlyFile ) {
 291                 return false;
 292         }
 293
 294         // Set $wgReadOnly and unset $wgReadOnlyFile, for faster access next time
 295         if ( is_file( $wgReadOnlyFile ) ) {
 296                 $wgReadOnly = file_get_contents( $wgReadOnlyFile );
 297         } else {
 298                 $wgReadOnly = false;
 299         }
 300         $wgReadOnlyFile = '';
 301         return $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 string lookup key for the message, usually
 317  *    defined in languages/Language.php
 318  */
 319 function wfMsg( $key ) {
 320         $args = func_get_args();
 321         array_shift( $args );
 322         return wfMsgReal( $key, $args, true );
 323 }
 324
 325 /**
 326  * Same as above except doesn't transform the message
 327  */
 328 function wfMsgNoTrans( $key ) {
 329         $args = func_get_args();
 330         array_shift( $args );
 331         return wfMsgReal( $key, $args, true, false );
 332 }
 333
 334 /**
 335  * Get a message from anywhere, for the current global language
 336  * set with $wgLanguageCode.
 337  *
 338  * Use this if the message should NOT change  dependent on the
 339  * language set in the user's preferences. This is the case for
 340  * most text written into logs, as well as link targets (such as
 341  * the name of the copyright policy page). Link titles, on the
 342  * other hand, should be shown in the UI language.
 343  *
 344  * Note that MediaWiki allows users to change the user interface
 345  * language in their preferences, but a single installation
 346  * typically only contains content in one language.
 347  *
 348  * Be wary of this distinction: If you use wfMsg() where you should
 349  * use wfMsgForContent(), a user of the software may have to
 350  * customize over 70 messages in order to, e.g., fix a link in every
 351  * possible language.
 352  *
 353  * @param string lookup key for the message, usually
 354  *    defined in languages/Language.php
 355  */
 356 function wfMsgForContent( $key ) {
 357         global $wgForceUIMsgAsContentMsg;
 358         $args = func_get_args();
 359         array_shift( $args );
 360         $forcontent = true;
 361         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 362                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 363                 $forcontent = false;
 364         return wfMsgReal( $key, $args, true, $forcontent );
 365 }
 366
 367 /**
 368  * Same as above except doesn't transform the message
 369  */
 370 function wfMsgForContentNoTrans( $key ) {
 371         global $wgForceUIMsgAsContentMsg;
 372         $args = func_get_args();
 373         array_shift( $args );
 374         $forcontent = true;
 375         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 376                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 377                 $forcontent = false;
 378         return wfMsgReal( $key, $args, true, $forcontent, false );
 379 }
 380
 381 /**
 382  * Get a message from the language file, for the UI elements
 383  */
 384 function wfMsgNoDB( $key ) {
 385         $args = func_get_args();
 386         array_shift( $args );
 387         return wfMsgReal( $key, $args, false );
 388 }
 389
 390 /**
 391  * Get a message from the language file, for the content
 392  */
 393 function wfMsgNoDBForContent( $key ) {
 394         global $wgForceUIMsgAsContentMsg;
 395         $args = func_get_args();
 396         array_shift( $args );
 397         $forcontent = true;
 398         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 399                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 400                 $forcontent = false;
 401         return wfMsgReal( $key, $args, false, $forcontent );
 402 }
 403
 404
 405 /**
 406  * Really get a message
 407  */
 408 function wfMsgReal( $key, $args, $useDB, $forContent=false, $transform = true ) {
 409         $fname = 'wfMsgReal';
 410         wfProfileIn( $fname );
 411
 412         $message = wfMsgGetKey( $key, $useDB, $forContent, $transform );
 413         $message = wfMsgReplaceArgs( $message, $args );
 414         wfProfileOut( $fname );
 415         return $message;
 416 }
 417
 418 /**
 419  * This function provides the message source for messages to be edited which are *not* stored in the database
 420 */
 421
 422 function wfMsgWeirdKey ( $key ) {
 423         $subsource = str_replace ( ' ' , '_' , $key ) ;
 424         $source = wfMsg ( $subsource ) ;
 425         if ( $source == "&lt;{$subsource}&gt;" ) {
 426                 # Try again with first char lower case
 427                 $subsource = strtolower ( substr ( $subsource , 0 , 1 ) ) . substr ( $subsource , 1 ) ;
 428                 $source = wfMsg ( $subsource ) ;
 429         }
 430         if ( $source == "&lt;{$subsource}&gt;" ) {
 431                 # Didn't work either, return blank text
 432                 $source = "" ;
 433         }
 434         return $source ;
 435 }
 436
 437 /**
 438  * Fetch a message string value, but don't replace any keys yet.
 439  * @param string $key
 440  * @param bool $useDB
 441  * @param bool $forContent
 442  * @return string
 443  * @access private
 444  */
 445 function wfMsgGetKey( $key, $useDB, $forContent = false, $transform = true ) {
 446         global $wgParser, $wgMsgParserOptions, $wgContLang, $wgMessageCache, $wgLang;
 447
 448         if ( is_object( $wgMessageCache ) )
 449                 $transstat = $wgMessageCache->getTransform();
 450
 451         if( is_object( $wgMessageCache ) ) {
 452                 if ( ! $transform )
 453                         $wgMessageCache->disableTransform();
 454                 $message = $wgMessageCache->get( $key, $useDB, $forContent );
 455         } else {
 456                 if( $forContent ) {
 457                         $lang = &$wgContLang;
 458                 } else {
 459                         $lang = &$wgLang;
 460                 }
 461
 462                 wfSuppressWarnings();
 463
 464                 if( is_object( $lang ) ) {
 465                         $message = $lang->getMessage( $key );
 466                 } else {
 467                         $message = false;
 468                 }
 469                 wfRestoreWarnings();
 470                 if($message === false)
 471                         $message = Language::getMessage($key);
 472                 if ( $transform && strstr( $message, '{{' ) !== false ) {
 473                         $message = $wgParser->transformMsg($message, $wgMsgParserOptions);
 474                 }
 475         }
 476
 477         if ( is_object( $wgMessageCache ) && ! $transform )
 478                 $wgMessageCache->setTransform( $transstat );
 479
 480         return $message;
 481 }
 482
 483 /**
 484  * Replace message parameter keys on the given formatted output.
 485  *
 486  * @param string $message
 487  * @param array $args
 488  * @return string
 489  * @access private
 490  */
 491 function wfMsgReplaceArgs( $message, $args ) {
 492         # Fix windows line-endings
 493         # Some messages are split with explode("\n", $msg)
 494         $message = str_replace( "\r", '', $message );
 495
 496         // Replace arguments
 497         if ( count( $args ) )
 498                 if ( is_array( $args[0] ) )
 499                         foreach ( $args[0] as $key => $val )
 500                                 $message = str_replace( '$' . $key, $val, $message );
 501         else {
 502                 foreach( $args as $n => $param )
 503                         $replacementKeys['$' . ($n + 1)] = $param;
 504                 $message = strtr( $message, $replacementKeys );
 505         }
 506
 507         return $message;
 508 }
 509
 510 /**
 511  * Return an HTML-escaped version of a message.
 512  * Parameter replacements, if any, are done *after* the HTML-escaping,
 513  * so parameters may contain HTML (eg links or form controls). Be sure
 514  * to pre-escape them if you really do want plaintext, or just wrap
 515  * the whole thing in htmlspecialchars().
 516  *
 517  * @param string $key
 518  * @param string ... parameters
 519  * @return string
 520  */
 521 function wfMsgHtml( $key ) {
 522         $args = func_get_args();
 523         array_shift( $args );
 524         return wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $key, true ) ), $args );
 525 }
 526
 527 /**
 528  * Return an HTML version of message
 529  * Parameter replacements, if any, are done *after* parsing the wiki-text message,
 530  * so parameters may contain HTML (eg links or form controls). Be sure
 531  * to pre-escape them if you really do want plaintext, or just wrap
 532  * the whole thing in htmlspecialchars().
 533  *
 534  * @param string $key
 535  * @param string ... parameters
 536  * @return string
 537  */
 538 function wfMsgWikiHtml( $key ) {
 539         global $wgOut;
 540         $args = func_get_args();
 541         array_shift( $args );
 542         return wfMsgReplaceArgs( $wgOut->parse( wfMsgGetKey( $key, true ), /* can't be set to false */ true ), $args );
 543 }
 544
 545 /**
 546  * Just like exit() but makes a note of it.
 547  * Commits open transactions except if the error parameter is set
 548  */
 549 function wfAbruptExit( $error = false ){
 550         global $wgLoadBalancer;
 551         static $called = false;
 552         if ( $called ){
 553                 exit( -1 );
 554         }
 555         $called = true;
 556
 557         if( function_exists( 'debug_backtrace' ) ){ // PHP >= 4.3
 558                 $bt = debug_backtrace();
 559                 for($i = 0; $i < count($bt) ; $i++){
 560                         $file = isset($bt[$i]['file']) ? $bt[$i]['file'] : "unknown";
 561                         $line = isset($bt[$i]['line']) ? $bt[$i]['line'] : "unknown";
 562                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 563                 }
 564         } else {
 565                 wfDebug('WARNING: Abrupt exit\n');
 566         }
 567
 568         wfProfileClose();
 569         logProfilingData();
 570
 571         if ( !$error ) {
 572                 $wgLoadBalancer->closeAll();
 573         }
 574         exit( -1 );
 575 }
 576
 577 /**
 578  * @todo document
 579  */
 580 function wfErrorExit() {
 581         wfAbruptExit( true );
 582 }
 583
 584 /**
 585  * Print a simple message and die, returning nonzero to the shell if any.
 586  * Plain die() fails to return nonzero to the shell if you pass a string.
 587  * @param string $msg
 588  */
 589 function wfDie( $msg='' ) {
 590         echo $msg;
 591         die( -1 );
 592 }
 593
 594 /**
 595  * Die with a backtrace
 596  * This is meant as a debugging aid to track down where bad data comes from.
 597  * Shouldn't be used in production code except maybe in "shouldn't happen" areas.
 598  *
 599  * @param string $msg Message shown when dieing.
 600  */
 601 function wfDebugDieBacktrace( $msg = '' ) {
 602         global $wgCommandLineMode;
 603
 604         $backtrace = wfBacktrace();
 605         if ( $backtrace !== false ) {
 606                 if ( $wgCommandLineMode ) {
 607                         $msg .= "\nBacktrace:\n$backtrace";
 608                 } else {
 609                         $msg .= "\n<p>Backtrace:</p>\n$backtrace";
 610                 }
 611         }
 612         echo $msg;
 613         echo wfReportTime()."\n";
 614         die( -1 );
 615 }
 616
 617         /**
 618          * Returns a HTML comment with the elapsed time since request.
 619          * This method has no side effects.
 620          * @return string
 621          */
 622         function wfReportTime() {
 623                 global $wgRequestTime;
 624
 625                 $now = wfTime();
 626                 list( $usec, $sec ) = explode( ' ', $wgRequestTime );
 627                 $start = (float)$sec + (float)$usec;
 628                 $elapsed = $now - $start;
 629
 630                 # Use real server name if available, so we know which machine
 631                 # in a server farm generated the current page.
 632                 if ( function_exists( 'posix_uname' ) ) {
 633                         $uname = @posix_uname();
 634                 } else {
 635                         $uname = false;
 636                 }
 637                 if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 638                         $hostname = $uname['nodename'];
 639                 } else {
 640                         # This may be a virtual server.
 641                         $hostname = $_SERVER['SERVER_NAME'];
 642                 }
 643                 $com = sprintf( "<!-- Served by %s in %01.2f secs. -->",
 644                   $hostname, $elapsed );
 645                 return $com;
 646         }
 647
 648 function wfBacktrace() {
 649         global $wgCommandLineMode;
 650         if ( !function_exists( 'debug_backtrace' ) ) {
 651                 return false;
 652         }
 653
 654         if ( $wgCommandLineMode ) {
 655                 $msg = '';
 656         } else {
 657                 $msg = "<ul>\n";
 658         }
 659         $backtrace = debug_backtrace();
 660         foreach( $backtrace as $call ) {
 661                 if( isset( $call['file'] ) ) {
 662                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 663                         $file = $f[count($f)-1];
 664                 } else {
 665                         $file = '-';
 666                 }
 667                 if( isset( $call['line'] ) ) {
 668                         $line = $call['line'];
 669                 } else {
 670                         $line = '-';
 671                 }
 672                 if ( $wgCommandLineMode ) {
 673                         $msg .= "$file line $line calls ";
 674                 } else {
 675                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
 676                 }
 677                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 678                 $msg .= $call['function'] . '()';
 679
 680                 if ( $wgCommandLineMode ) {
 681                         $msg .= "\n";
 682                 } else {
 683                         $msg .= "</li>\n";
 684                 }
 685         }
 686         if ( $wgCommandLineMode ) {
 687                 $msg .= "\n";
 688         } else {
 689                 $msg .= "</ul>\n";
 690         }
 691
 692         return $msg;
 693 }
 694
 695
 696 /* Some generic result counters, pulled out of SearchEngine */
 697
 698
 699 /**
 700  * @todo document
 701  */
 702 function wfShowingResults( $offset, $limit ) {
 703         global $wgLang;
 704         return wfMsg( 'showingresults', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 705 }
 706
 707 /**
 708  * @todo document
 709  */
 710 function wfShowingResultsNum( $offset, $limit, $num ) {
 711         global $wgLang;
 712         return wfMsg( 'showingresultsnum', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 713 }
 714
 715 /**
 716  * @todo document
 717  */
 718 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
 719         global $wgUser, $wgLang;
 720         $fmtLimit = $wgLang->formatNum( $limit );
 721         $prev = wfMsg( 'prevn', $fmtLimit );
 722         $next = wfMsg( 'nextn', $fmtLimit );
 723
 724         if( is_object( $link ) ) {
 725                 $title =& $link;
 726         } else {
 727                 $title = Title::newFromText( $link );
 728                 if( is_null( $title ) ) {
 729                         return false;
 730                 }
 731         }
 732
 733         $sk = $wgUser->getSkin();
 734         if ( 0 != $offset ) {
 735                 $po = $offset - $limit;
 736                 if ( $po < 0 ) { $po = 0; }
 737                 $q = "limit={$limit}&offset={$po}";
 738                 if ( '' != $query ) { $q .= '&'.$query; }
 739                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$prev}</a>";
 740         } else { $plink = $prev; }
 741
 742         $no = $offset + $limit;
 743         $q = 'limit='.$limit.'&offset='.$no;
 744         if ( '' != $query ) { $q .= '&'.$query; }
 745
 746         if ( $atend ) {
 747                 $nlink = $next;
 748         } else {
 749                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$next}</a>";
 750         }
 751         $nums = wfNumLink( $offset, 20, $title, $query ) . ' | ' .
 752           wfNumLink( $offset, 50, $title, $query ) . ' | ' .
 753           wfNumLink( $offset, 100, $title, $query ) . ' | ' .
 754           wfNumLink( $offset, 250, $title, $query ) . ' | ' .
 755           wfNumLink( $offset, 500, $title, $query );
 756
 757         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 758 }
 759
 760 /**
 761  * @todo document
 762  */
 763 function wfNumLink( $offset, $limit, &$title, $query = '' ) {
 764         global $wgUser, $wgLang;
 765         if ( '' == $query ) { $q = ''; }
 766         else { $q = $query.'&'; }
 767         $q .= 'limit='.$limit.'&offset='.$offset;
 768
 769         $fmtLimit = $wgLang->formatNum( $limit );
 770         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$fmtLimit}</a>";
 771         return $s;
 772 }
 773
 774 /**
 775  * @todo document
 776  * @todo FIXME: we may want to blacklist some broken browsers
 777  *
 778  * @return bool Whereas client accept gzip compression
 779  */
 780 function wfClientAcceptsGzip() {
 781         global $wgUseGzip;
 782         if( $wgUseGzip ) {
 783                 # FIXME: we may want to blacklist some broken browsers
 784                 if( preg_match(
 785                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 786                         $_SERVER['HTTP_ACCEPT_ENCODING'],
 787                         $m ) ) {
 788                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
 789                         wfDebug( " accepts gzip\n" );
 790                         return true;
 791                 }
 792         }
 793         return false;
 794 }
 795
 796 /**
 797  * Yay, more global functions!
 798  */
 799 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
 800         global $wgRequest;
 801         return $wgRequest->getLimitOffset( $deflimit, $optionname );
 802 }
 803
 804 /**
 805  * Escapes the given text so that it may be output using addWikiText()
 806  * without any linking, formatting, etc. making its way through. This
 807  * is achieved by substituting certain characters with HTML entities.
 808  * As required by the callers, <nowiki> is not used. It currently does
 809  * not filter out characters which have special meaning only at the
 810  * start of a line, such as "*".
 811  *
 812  * @param string $text Text to be escaped
 813  */
 814 function wfEscapeWikiText( $text ) {
 815         $text = str_replace(
 816                 array( '[',             '|',      '\'',    'ISBN '        , '://'         , "\n=", '{{' ),
 817                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', '&#58;//' , "\n&#61;", '&#123;&#123;' ),
 818                 htmlspecialchars($text) );
 819         return $text;
 820 }
 821
 822 /**
 823  * @todo document
 824  */
 825 function wfQuotedPrintable( $string, $charset = '' ) {
 826         # Probably incomplete; see RFC 2045
 827         if( empty( $charset ) ) {
 828                 global $wgInputEncoding;
 829                 $charset = $wgInputEncoding;
 830         }
 831         $charset = strtoupper( $charset );
 832         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
 833
 834         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 835         $replace = $illegal . '\t ?_';
 836         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 837         $out = "=?$charset?Q?";
 838         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 839         $out .= '?=';
 840         return $out;
 841 }
 842
 843 /**
 844  * Returns an escaped string suitable for inclusion in a string literal
 845  * for JavaScript source code.
 846  * Illegal control characters are assumed not to be present.
 847  *
 848  * @param string $string
 849  * @return string
 850  */
 851 function wfEscapeJsString( $string ) {
 852         // See ECMA 262 section 7.8.4 for string literal format
 853         $pairs = array(
 854                 "\\" => "\\\\",
 855                 "\"" => "\\\"",
 856                 '\'' => '\\\'',
 857                 "\n" => "\\n",
 858                 "\r" => "\\r",
 859
 860                 # To avoid closing the element or CDATA section
 861                 "<" => "\\x3c",
 862                 ">" => "\\x3e",
 863         );
 864         return strtr( $string, $pairs );
 865 }
 866
 867 /**
 868  * @todo document
 869  * @return float
 870  */
 871 function wfTime() {
 872         $st = explode( ' ', microtime() );
 873         return (float)$st[0] + (float)$st[1];
 874 }
 875
 876 /**
 877  * Changes the first character to an HTML entity
 878  */
 879 function wfHtmlEscapeFirst( $text ) {
 880         $ord = ord($text);
 881         $newText = substr($text, 1);
 882         return "&#$ord;$newText";
 883 }
 884
 885 /**
 886  * Sets dest to source and returns the original value of dest
 887  * If source is NULL, it just returns the value, it doesn't set the variable
 888  */
 889 function wfSetVar( &$dest, $source ) {
 890         $temp = $dest;
 891         if ( !is_null( $source ) ) {
 892                 $dest = $source;
 893         }
 894         return $temp;
 895 }
 896
 897 /**
 898  * As for wfSetVar except setting a bit
 899  */
 900 function wfSetBit( &$dest, $bit, $state = true ) {
 901         $temp = (bool)($dest & $bit );
 902         if ( !is_null( $state ) ) {
 903                 if ( $state ) {
 904                         $dest |= $bit;
 905                 } else {
 906                         $dest &= ~$bit;
 907                 }
 908         }
 909         return $temp;
 910 }
 911
 912 /**
 913  * This function takes two arrays as input, and returns a CGI-style string, e.g.
 914  * "days=7&limit=100". Options in the first array override options in the second.
 915  * Options set to "" will not be output.
 916  */
 917 function wfArrayToCGI( $array1, $array2 = NULL )
 918 {
 919         if ( !is_null( $array2 ) ) {
 920                 $array1 = $array1 + $array2;
 921         }
 922
 923         $cgi = '';
 924         foreach ( $array1 as $key => $value ) {
 925                 if ( '' !== $value ) {
 926                         if ( '' != $cgi ) {
 927                                 $cgi .= '&';
 928                         }
 929                         $cgi .= urlencode( $key ) . '=' . urlencode( $value );
 930                 }
 931         }
 932         return $cgi;
 933 }
 934
 935 /**
 936  * This is obsolete, use SquidUpdate::purge()
 937  * @deprecated
 938  */
 939 function wfPurgeSquidServers ($urlArr) {
 940         SquidUpdate::purge( $urlArr );
 941 }
 942
 943 /**
 944  * Windows-compatible version of escapeshellarg()
 945  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
 946  * function puts single quotes in regardless of OS
 947  */
 948 function wfEscapeShellArg( ) {
 949         $args = func_get_args();
 950         $first = true;
 951         $retVal = '';
 952         foreach ( $args as $arg ) {
 953                 if ( !$first ) {
 954                         $retVal .= ' ';
 955                 } else {
 956                         $first = false;
 957                 }
 958
 959                 if ( wfIsWindows() ) {
 960                         $retVal .= '"' . str_replace( '"','\"', $arg ) . '"';
 961                 } else {
 962                         $retVal .= escapeshellarg( $arg );
 963                 }
 964         }
 965         return $retVal;
 966 }
 967
 968 /**
 969  * wfMerge attempts to merge differences between three texts.
 970  * Returns true for a clean merge and false for failure or a conflict.
 971  */
 972 function wfMerge( $old, $mine, $yours, &$result ){
 973         global $wgDiff3;
 974
 975         # This check may also protect against code injection in
 976         # case of broken installations.
 977         if(! file_exists( $wgDiff3 ) ){
 978                 wfDebug( "diff3 not found\n" );
 979                 return false;
 980         }
 981
 982         # Make temporary files
 983         $td = wfTempDir();
 984         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
 985         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
 986         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
 987
 988         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
 989         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
 990         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
 991
 992         # Check for a conflict
 993         $cmd = $wgDiff3 . ' -a --overlap-only ' .
 994           wfEscapeShellArg( $mytextName ) . ' ' .
 995           wfEscapeShellArg( $oldtextName ) . ' ' .
 996           wfEscapeShellArg( $yourtextName );
 997         $handle = popen( $cmd, 'r' );
 998
 999         if( fgets( $handle, 1024 ) ){
1000                 $conflict = true;
1001         } else {
1002                 $conflict = false;
1003         }
1004         pclose( $handle );
1005
1006         # Merge differences
1007         $cmd = $wgDiff3 . ' -a -e --merge ' .
1008           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
1009         $handle = popen( $cmd, 'r' );
1010         $result = '';
1011         do {
1012                 $data = fread( $handle, 8192 );
1013                 if ( strlen( $data ) == 0 ) {
1014                         break;
1015                 }
1016                 $result .= $data;
1017         } while ( true );
1018         pclose( $handle );
1019         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
1020
1021         if ( $result === '' && $old !== '' && $conflict == false ) {
1022                 wfDebug( "Unexpected null result from diff3. Command: $cmd\n" );
1023                 $conflict = true;
1024         }
1025         return ! $conflict;
1026 }
1027
1028 /**
1029  * @todo document
1030  */
1031 function wfVarDump( $var ) {
1032         global $wgOut;
1033         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
1034         if ( headers_sent() || !@is_object( $wgOut ) ) {
1035                 print $s;
1036         } else {
1037                 $wgOut->addHTML( $s );
1038         }
1039 }
1040
1041 /**
1042  * Provide a simple HTTP error.
1043  */
1044 function wfHttpError( $code, $label, $desc ) {
1045         global $wgOut;
1046         $wgOut->disable();
1047         header( "HTTP/1.0 $code $label" );
1048         header( "Status: $code $label" );
1049         $wgOut->sendCacheControl();
1050
1051         header( 'Content-type: text/html' );
1052         print "<html><head><title>" .
1053                 htmlspecialchars( $label ) .
1054                 "</title></head><body><h1>" .
1055                 htmlspecialchars( $label ) .
1056                 "</h1><p>" .
1057                 htmlspecialchars( $desc ) .
1058                 "</p></body></html>\n";
1059 }
1060
1061 /**
1062  * Converts an Accept-* header into an array mapping string values to quality
1063  * factors
1064  */
1065 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
1066         # No arg means accept anything (per HTTP spec)
1067         if( !$accept ) {
1068                 return array( $def => 1 );
1069         }
1070
1071         $prefs = array();
1072
1073         $parts = explode( ',', $accept );
1074
1075         foreach( $parts as $part ) {
1076                 # FIXME: doesn't deal with params like 'text/html; level=1'
1077                 @list( $value, $qpart ) = explode( ';', $part );
1078                 if( !isset( $qpart ) ) {
1079                         $prefs[$value] = 1;
1080                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
1081                         $prefs[$value] = $match[1];
1082                 }
1083         }
1084
1085         return $prefs;
1086 }
1087
1088 /**
1089  * Checks if a given MIME type matches any of the keys in the given
1090  * array. Basic wildcards are accepted in the array keys.
1091  *
1092  * Returns the matching MIME type (or wildcard) if a match, otherwise
1093  * NULL if no match.
1094  *
1095  * @param string $type
1096  * @param array $avail
1097  * @return string
1098  * @access private
1099  */
1100 function mimeTypeMatch( $type, $avail ) {
1101         if( array_key_exists($type, $avail) ) {
1102                 return $type;
1103         } else {
1104                 $parts = explode( '/', $type );
1105                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
1106                         return $parts[0] . '/*';
1107                 } elseif( array_key_exists( '*/*', $avail ) ) {
1108                         return '*/*';
1109                 } else {
1110                         return NULL;
1111                 }
1112         }
1113 }
1114
1115 /**
1116  * Returns the 'best' match between a client's requested internet media types
1117  * and the server's list of available types. Each list should be an associative
1118  * array of type to preference (preference is a float between 0.0 and 1.0).
1119  * Wildcards in the types are acceptable.
1120  *
1121  * @param array $cprefs Client's acceptable type list
1122  * @param array $sprefs Server's offered types
1123  * @return string
1124  *
1125  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
1126  * XXX: generalize to negotiate other stuff
1127  */
1128 function wfNegotiateType( $cprefs, $sprefs ) {
1129         $combine = array();
1130
1131         foreach( array_keys($sprefs) as $type ) {
1132                 $parts = explode( '/', $type );
1133                 if( $parts[1] != '*' ) {
1134                         $ckey = mimeTypeMatch( $type, $cprefs );
1135                         if( $ckey ) {
1136                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1137                         }
1138                 }
1139         }
1140
1141         foreach( array_keys( $cprefs ) as $type ) {
1142                 $parts = explode( '/', $type );
1143                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
1144                         $skey = mimeTypeMatch( $type, $sprefs );
1145                         if( $skey ) {
1146                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1147                         }
1148                 }
1149         }
1150
1151         $bestq = 0;
1152         $besttype = NULL;
1153
1154         foreach( array_keys( $combine ) as $type ) {
1155                 if( $combine[$type] > $bestq ) {
1156                         $besttype = $type;
1157                         $bestq = $combine[$type];
1158                 }
1159         }
1160
1161         return $besttype;
1162 }
1163
1164 /**
1165  * Array lookup
1166  * Returns an array where the values in the first array are replaced by the
1167  * values in the second array with the corresponding keys
1168  *
1169  * @return array
1170  */
1171 function wfArrayLookup( $a, $b ) {
1172         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
1173 }
1174
1175 /**
1176  * Convenience function; returns MediaWiki timestamp for the present time.
1177  * @return string
1178  */
1179 function wfTimestampNow() {
1180         # return NOW
1181         return wfTimestamp( TS_MW, time() );
1182 }
1183
1184 /**
1185  * Reference-counted warning suppression
1186  */
1187 function wfSuppressWarnings( $end = false ) {
1188         static $suppressCount = 0;
1189         static $originalLevel = false;
1190
1191         if ( $end ) {
1192                 if ( $suppressCount ) {
1193                         --$suppressCount;
1194                         if ( !$suppressCount ) {
1195                                 error_reporting( $originalLevel );
1196                         }
1197                 }
1198         } else {
1199                 if ( !$suppressCount ) {
1200                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
1201                 }
1202                 ++$suppressCount;
1203         }
1204 }
1205
1206 /**
1207  * Restore error level to previous value
1208  */
1209 function wfRestoreWarnings() {
1210         wfSuppressWarnings( true );
1211 }
1212
1213 # Autodetect, convert and provide timestamps of various types
1214
1215 /**
1216  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1217  */
1218 define('TS_UNIX', 0);
1219
1220 /**
1221  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1222  */
1223 define('TS_MW', 1);
1224
1225 /**
1226  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1227  */
1228 define('TS_DB', 2);
1229
1230 /**
1231  * RFC 2822 format, for E-mail and HTTP headers
1232  */
1233 define('TS_RFC2822', 3);
1234
1235 /**
1236  * ISO 8601 format with no timezone: 1986-02-09T20:00:00Z
1237  *
1238  * This is used by Special:Export
1239  */
1240 define('TS_ISO_8601', 4);
1241
1242 /**
1243  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1244  *
1245  * @link http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1246  *       DateTime tag and page 36 for the DateTimeOriginal and
1247  *       DateTimeDigitized tags.
1248  */
1249 define('TS_EXIF', 5);
1250
1251 /**
1252  * Oracle format time.
1253  */
1254 define('TS_ORACLE', 6);
1255
1256 /**
1257  * @param mixed $outputtype A timestamp in one of the supported formats, the
1258  *                          function will autodetect which format is supplied
1259                             and act accordingly.
1260  * @return string Time in the format specified in $outputtype
1261  */
1262 function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
1263         $uts = 0;
1264         if ($ts==0) {
1265                 $uts=time();
1266         } elseif (preg_match("/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
1267                 # TS_DB
1268                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1269                             (int)$da[2],(int)$da[3],(int)$da[1]);
1270         } elseif (preg_match("/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
1271                 # TS_EXIF
1272                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1273                         (int)$da[2],(int)$da[3],(int)$da[1]);
1274         } elseif (preg_match("/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/",$ts,$da)) {
1275                 # TS_MW
1276                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1277                             (int)$da[2],(int)$da[3],(int)$da[1]);
1278         } elseif (preg_match("/^(\d{1,13})$/",$ts,$datearray)) {
1279                 # TS_UNIX
1280                 $uts=$ts;
1281         } elseif (preg_match('/^(\d{1,2})-(...)-(\d\d(\d\d)?) (\d\d)\.(\d\d)\.(\d\d)/', $ts, $da)) {
1282                 # TS_ORACLE
1283                 $uts = strtotime(preg_replace('/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
1284                                 str_replace("+00:00", "UTC", $ts)));
1285         } elseif (preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})Z$/', $ts, $da)) {
1286                 # TS_ISO_8601
1287                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1288                         (int)$da[2],(int)$da[3],(int)$da[1]);
1289         } else {
1290                 # Bogus value; fall back to the epoch...
1291                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1292                 $uts = 0;
1293         }
1294
1295
1296         switch($outputtype) {
1297                 case TS_UNIX:
1298                         return $uts;
1299                 case TS_MW:
1300                         return gmdate( 'YmdHis', $uts );
1301                 case TS_DB:
1302                         return gmdate( 'Y-m-d H:i:s', $uts );
1303                 case TS_ISO_8601:
1304                         return gmdate( 'Y-m-d\TH:i:s\Z', $uts );
1305                 // This shouldn't ever be used, but is included for completeness
1306                 case TS_EXIF:
1307                         return gmdate(  'Y:m:d H:i:s', $uts );
1308                 case TS_RFC2822:
1309                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1310                 case TS_ORACLE:
1311                         return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
1312                 default:
1313                         wfDebugDieBacktrace( 'wfTimestamp() called with illegal output type.');
1314         }
1315 }
1316
1317 /**
1318  * Return a formatted timestamp, or null if input is null.
1319  * For dealing with nullable timestamp columns in the database.
1320  * @param int $outputtype
1321  * @param string $ts
1322  * @return string
1323  */
1324 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1325         if( is_null( $ts ) ) {
1326                 return null;
1327         } else {
1328                 return wfTimestamp( $outputtype, $ts );
1329         }
1330 }
1331
1332 /**
1333  * Check if the operating system is Windows
1334  *
1335  * @return bool True if it's Windows, False otherwise.
1336  */
1337 function wfIsWindows() {
1338         if (substr(php_uname(), 0, 7) == 'Windows') {
1339                 return true;
1340         } else {
1341                 return false;
1342         }
1343 }
1344
1345 /**
1346  * Swap two variables
1347  */
1348 function swap( &$x, &$y ) {
1349         $z = $x;
1350         $x = $y;
1351         $y = $z;
1352 }
1353
1354 function wfGetCachedNotice( $name ) {
1355         global $wgOut, $parserMemc, $wgDBname;
1356         $fname = 'wfGetCachedNotice';
1357         wfProfileIn( $fname );
1358
1359         $needParse = false;
1360         $notice = wfMsgForContent( $name );
1361         if( $notice == '&lt;'. $name . ';&gt' || $notice == '-' ) {
1362                 wfProfileOut( $fname );
1363                 return( false );
1364         }
1365
1366         $cachedNotice = $parserMemc->get( $wgDBname . ':' . $name );
1367         if( is_array( $cachedNotice ) ) {
1368                 if( md5( $notice ) == $cachedNotice['hash'] ) {
1369                         $notice = $cachedNotice['html'];
1370                 } else {
1371                         $needParse = true;
1372                 }
1373         } else {
1374                 $needParse = true;
1375         }
1376
1377         if( $needParse ) {
1378                 if( is_object( $wgOut ) ) {
1379                         $parsed = $wgOut->parse( $notice );
1380                         $parserMemc->set( $wgDBname . ':' . $name, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1381                         $notice = $parsed;
1382                 } else {
1383                         wfDebug( 'wfGetCachedNotice called for ' . $name . ' with no $wgOut available' );
1384                         $notice = '';
1385                 }
1386         }
1387
1388         wfProfileOut( $fname );
1389         return $notice;
1390 }
1391
1392 function wfGetSiteNotice() {
1393         global $wgUser, $wgSiteNotice;
1394         $fname = 'wfGetSiteNotice';
1395         wfProfileIn( $fname );
1396
1397         if( $wgUser->isLoggedIn() ) {
1398                 $siteNotice = wfGetCachedNotice( 'sitenotice' );
1399                 $siteNotice = !$siteNotice ? $wgSiteNotice : $siteNotice;
1400         } else {
1401                 $anonNotice = wfGetCachedNotice( 'anonnotice' );
1402                 if( !$anonNotice ) {
1403                         $siteNotice = wfGetCachedNotice( 'sitenotice' );
1404                         $siteNotice = !$siteNotice ? $wgSiteNotice : $siteNotice;
1405                 } else {
1406                         $siteNotice = $anonNotice;
1407                 }
1408         }
1409
1410         wfProfileOut( $fname );
1411         return( $siteNotice );
1412 }
1413
1414 /**
1415  * Format an XML element with given attributes and, optionally, text content.
1416  * Element and attribute names are assumed to be ready for literal inclusion.
1417  * Strings are assumed to not contain XML-illegal characters; special
1418  * characters (<, >, &) are escaped but illegals are not touched.
1419  *
1420  * @param string $element
1421  * @param array $attribs Name=>value pairs. Values will be escaped.
1422  * @param string $contents NULL to make an open tag only; '' for a contentless closed tag (default)
1423  * @return string
1424  */
1425 function wfElement( $element, $attribs = null, $contents = '') {
1426         $out = '<' . $element;
1427         if( !is_null( $attribs ) ) {
1428                 foreach( $attribs as $name => $val ) {
1429                         $out .= ' ' . $name . '="' . htmlspecialchars( $val ) . '"';
1430                 }
1431         }
1432         if( is_null( $contents ) ) {
1433                 $out .= '>';
1434         } else {
1435                 if( $contents == '' ) {
1436                         $out .= ' />';
1437                 } else {
1438                         $out .= '>' . htmlspecialchars( $contents ) . "</$element>";
1439                 }
1440         }
1441         return $out;
1442 }
1443
1444 /**
1445  * Format an XML element as with wfElement(), but run text through the
1446  * UtfNormal::cleanUp() validator first to ensure that no invalid UTF-8
1447  * is passed.
1448  *
1449  * @param string $element
1450  * @param array $attribs Name=>value pairs. Values will be escaped.
1451  * @param string $contents NULL to make an open tag only; '' for a contentless closed tag (default)
1452  * @return string
1453  */
1454 function wfElementClean( $element, $attribs = array(), $contents = '') {
1455         if( $attribs ) {
1456                 $attribs = array_map( array( 'UtfNormal', 'cleanUp' ), $attribs );
1457         }
1458         if( $contents ) {
1459                 $contents = UtfNormal::cleanUp( $contents );
1460         }
1461         return wfElement( $element, $attribs, $contents );
1462 }
1463
1464 // Shortcuts
1465 function wfOpenElement( $element, $attribs = null ) { return wfElement( $element, $attribs, null ); }
1466 function wfCloseElement( $element ) { return "</$element>"; }
1467
1468 /**
1469  * Create a namespace selector
1470  *
1471  * @param mixed $selected The namespace which should be selected, default ''
1472  * @param string $allnamespaces Value of a special item denoting all namespaces. Null to not include (default)
1473  * @return Html string containing the namespace selector
1474  */
1475 function &HTMLnamespaceselector($selected = '', $allnamespaces = null) {
1476         global $wgContLang;
1477         if( $selected !== '' ) {
1478                 if( is_null( $selected ) ) {
1479                         // No namespace selected; let exact match work without hitting Main
1480                         $selected = '';
1481                 } else {
1482                         // Let input be numeric strings without breaking the empty match.
1483                         $selected = intval( $selected );
1484                 }
1485         }
1486         $s = "<select name='namespace' class='namespaceselector'>\n\t";
1487         $arr = $wgContLang->getFormattedNamespaces();
1488         if( !is_null($allnamespaces) ) {
1489                 $arr = array($allnamespaces => wfMsgHtml('namespacesall')) + $arr;
1490         }
1491         foreach ($arr as $index => $name) {
1492                 if ($index < NS_MAIN) continue;
1493
1494                 $name = $index !== 0 ? $name : wfMsgHtml('blanknamespace');
1495
1496                 if ($index === $selected) {
1497                         $s .= wfElement("option",
1498                                         array("value" => $index, "selected" => "selected"),
1499                                         $name);
1500                 } else {
1501                         $s .= wfElement("option", array("value" => $index), $name);
1502                 }
1503         }
1504         $s .= "\n</select>\n";
1505         return $s;
1506 }
1507
1508 /** Global singleton instance of MimeMagic. This is initialized on demand,
1509 * please always use the wfGetMimeMagic() function to get the instance.
1510 *
1511 * @access private
1512 */
1513 $wgMimeMagic= NULL;
1514
1515 /** Factory functions for the global MimeMagic object.
1516 * This function always returns the same singleton instance of MimeMagic.
1517 * That objects will be instantiated on the first call to this function.
1518 * If needed, the MimeMagic.php file is automatically included by this function.
1519 * @return MimeMagic the global MimeMagic objects.
1520 */
1521 function &wfGetMimeMagic() {
1522         global $wgMimeMagic;
1523
1524         if (!is_null($wgMimeMagic)) {
1525                 return $wgMimeMagic;
1526         }
1527
1528         if (!class_exists("MimeMagic")) {
1529                 #include on demand
1530                 require_once("MimeMagic.php");
1531         }
1532
1533         $wgMimeMagic= new MimeMagic();
1534
1535         return $wgMimeMagic;
1536 }
1537
1538
1539 /**
1540  * Tries to get the system directory for temporary files.
1541  * The TMPDIR, TMP, and TEMP environment variables are checked in sequence,
1542  * and if none are set /tmp is returned as the generic Unix default.
1543  *
1544  * NOTE: When possible, use the tempfile() function to create temporary
1545  * files to avoid race conditions on file creation, etc.
1546  *
1547  * @return string
1548  */
1549 function wfTempDir() {
1550         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
1551                 $tmp = getenv( $var );
1552                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
1553                         return $tmp;
1554                 }
1555         }
1556         # Hope this is Unix of some kind!
1557         return '/tmp';
1558 }
1559
1560 /**
1561  * Make directory, and make all parent directories if they don't exist
1562  */
1563 function wfMkdirParents( $fullDir, $mode ) {
1564         $parts = explode( '/', $fullDir );
1565         $path = '';
1566
1567         foreach ( $parts as $dir ) {
1568                 $path .= $dir . '/';
1569                 if ( !is_dir( $path ) ) {
1570                         if ( !mkdir( $path, $mode ) ) {
1571                                 return false;
1572                         }
1573                 }
1574         }
1575         return true;
1576 }
1577
1578 /**
1579  * Increment a statistics counter
1580  */
1581 function wfIncrStats( $key ) {
1582         global $wgDBname, $wgMemc;
1583         $key = "$wgDBname:stats:$key";
1584         if ( is_null( $wgMemc->incr( $key ) ) ) {
1585                 $wgMemc->add( $key, 1 );
1586         }
1587 }
1588
1589 /**
1590  * @param mixed $nr The number to format
1591  * @param int $acc The number of digits after the decimal point, default 2
1592  * @param bool $round Whether or not to round the value, default true
1593  * @return float
1594  */
1595 function wfPercent( $nr, $acc = 2, $round = true ) {
1596         $ret = sprintf( "%.${acc}f", $nr );
1597         return $round ? round( $ret, $acc ) . '%' : "$ret%";
1598 }
1599
1600 /**
1601  * Encrypt a username/password.
1602  *
1603  * @param string $userid ID of the user
1604  * @param string $password Password of the user
1605  * @return string Hashed password
1606  */
1607 function wfEncryptPassword( $userid, $password ) {
1608         global $wgPasswordSalt;
1609         $p = md5( $password);
1610
1611         if($wgPasswordSalt)
1612                 return md5( "{$userid}-{$p}" );
1613         else
1614                 return $p;
1615 }
1616
1617 /**
1618  * Appends to second array if $value differs from that in $default
1619  */
1620 function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
1621         if ( is_null( $changed ) ) {
1622                 wfDebugDieBacktrace('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
1623         }
1624         if ( $default[$key] !== $value ) {
1625                 $changed[$key] = $value;
1626         }
1627 }
1628
1629 /**
1630  * Since wfMsg() and co suck, they don't return false if the message key they
1631  * looked up didn't exist but a XHTML string, this function checks for the
1632  * nonexistance of messages by looking at wfMsg() output
1633  *
1634  * @param $msg      The message key looked up
1635  * @param $wfMsgOut The output of wfMsg*()
1636  * @return bool
1637  */
1638 function wfEmptyMsg( $msg, $wfMsgOut ) {
1639         return $wfMsgOut === "&lt;$msg&gt;";
1640 }
1641
1642 /**
1643  * Find out whether or not a mixed variable exists in a string
1644  *
1645  * @param mixed  needle
1646  * @param string haystack
1647  * @return bool
1648  */
1649 function in_string( $needle, $str ) {
1650         return strpos( $str, $needle ) !== false;
1651 }
1652
1653 /**
1654  * Returns a regular expression of url protocols
1655  *
1656  * @return string
1657  */
1658 function wfUrlProtocols() {
1659         global $wgUrlProtocols;
1660
1661         $protocols = array();
1662         foreach ($wgUrlProtocols as $protocol)
1663                 $protocols[] = preg_quote( $protocol, '/' );
1664
1665         return implode( '|', $protocols );
1666 }
1667
1668 /**
1669  * Check if a string is well-formed XML.
1670  * Must include the surrounding tag.
1671  *
1672  * @param string $text
1673  * @return bool
1674  *
1675  * @todo Error position reporting return
1676  */
1677 function wfIsWellFormedXml( $text ) {
1678         $parser = xml_parser_create( "UTF-8" );
1679
1680         # case folding violates XML standard, turn it off
1681         xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
1682
1683         if( !xml_parse( $parser, $text, true ) ) {
1684                 $err = xml_error_string( xml_get_error_code( $parser ) );
1685                 $position = xml_get_current_byte_index( $parser );
1686                 //$fragment = $this->extractFragment( $html, $position );
1687                 //$this->mXmlError = "$err at byte $position:\n$fragment";
1688                 xml_parser_free( $parser );
1689                 return false;
1690         }
1691         xml_parser_free( $parser );
1692         return true;
1693 }
1694
1695 /**
1696  * Check if a string is a well-formed XML fragment.
1697  * Wraps fragment in an <html> bit and doctype, so it can be a fragment
1698  * and can use HTML named entities.
1699  *
1700  * @param string $text
1701  * @return bool
1702  */
1703 function wfIsWellFormedXmlFragment( $text ) {
1704         $html =
1705                 Sanitizer::hackDocType() .
1706                 '<html>' .
1707                 $text .
1708                 '</html>';
1709         return wfIsWellFormedXml( $html );
1710 }
1711
1712 /**
1713  * shell_exec() with time and memory limits mirrored from the PHP configuration,
1714  * if supported.
1715  */
1716 function wfShellExec( $cmd )
1717 {
1718         global $IP;
1719
1720         if ( php_uname( 's' ) == 'Linux' ) {
1721                 $time = ini_get( 'max_execution_time' );
1722                 $mem = ini_get( 'memory_limit' );
1723                 if( preg_match( '/^([0-9]+)[Mm]$/', trim( $mem ), $m ) ) {
1724                         $mem = intval( $m[1] * (1024*1024) );
1725                 }
1726                 if ( $time > 0 && $mem > 0 ) {
1727                         $script = "$IP/bin/ulimit.sh";
1728                         if ( is_executable( $script ) ) {
1729                                 $memKB = intval( $mem / 1024 );
1730                                 $cmd = escapeshellarg( $script ) . " $time $memKB $cmd";
1731                         }
1732                 }
1733         }
1734         return shell_exec( $cmd );
1735 }
1736
1737 /**
1738  * This function works like "use VERSION" in Perl, the program will die with a
1739  * backtrace if the current version of PHP is less than the version provided
1740  *
1741  * This is useful for extensions which due to their nature are not kept in sync
1742  * with releases, and might depend on other versions of PHP than the main code
1743  *
1744  * Note: PHP might die due to parsing errors in some cases before it ever
1745  *       manages to call this function, such is life
1746  *
1747  * @see perldoc -f use
1748  *
1749  * @param mixed $version The version to check, can be a string, an integer, or
1750  *                       a float
1751  */
1752 function wfUsePHP( $req_ver ) {
1753         $php_ver = PHP_VERSION;
1754
1755         if ( version_compare( $php_ver, (string)$req_ver, '<' ) )
1756                  wfDebugDieBacktrace( "PHP $req_ver required--this is only $php_ver" );
1757 }
1758
1759 /**
1760  * This function works like "use VERSION" in Perl except it checks the version
1761  * of MediaWiki, the program will die with a backtrace if the current version
1762  * of MediaWiki is less than the version provided.
1763  *
1764  * This is useful for extensions which due to their nature are not kept in sync
1765  * with releases
1766  *
1767  * @see perldoc -f use
1768  *
1769  * @param mixed $version The version to check, can be a string, an integer, or
1770  *                       a float
1771  */
1772 function wfUseMW( $req_ver ) {
1773         global $wgVersion;
1774
1775         if ( version_compare( $wgVersion, (string)$req_ver, '<' ) )
1776                 wfDebugDieBacktrace( "MediaWiki $req_ver required--this is only $wgVersion" );
1777 }
1778
1779 /**
1780  * Escape a string to make it suitable for inclusion in a preg_replace()
1781  * replacement parameter.
1782  *
1783  * @param string $string
1784  * @return string
1785  */
1786 function wfRegexReplacement( $string ) {
1787         $string = str_replace( '\\', '\\\\', $string );
1788         $string = str_replace( '$', '\\$', $string );
1789         return $string;
1790 }
1791
1792
1793 ?>