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( 'LogPage.php' );
  31 require_once( 'normal/UtfNormalUtil.php' );
  32 require_once( 'XmlFunctions.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
 111 /**
 112  * Wrapper for clone() for PHP 4, for the moment.
 113  * PHP 5 won't let you declare a 'clone' function, even conditionally,
 114  * so it has to be a wrapper with a different name.
 115  */
 116 function wfClone( $object ) {
 117         // WARNING: clone() is not a function in PHP 5, so function_exists fails.
 118         if( version_compare( PHP_VERSION, '5.0' ) < 0 ) {
 119                 return $object;
 120         } else {
 121                 return clone( $object );
 122         }
 123 }
 124
 125 /**
 126  * Where as we got a random seed
 127  * @var bool $wgTotalViews
 128  */
 129 $wgRandomSeeded = false;
 130
 131 /**
 132  * Seed Mersenne Twister
 133  * Only necessary in PHP < 4.2.0
 134  *
 135  * @return bool
 136  */
 137 function wfSeedRandom() {
 138         global $wgRandomSeeded;
 139
 140         if ( ! $wgRandomSeeded && version_compare( phpversion(), '4.2.0' ) < 0 ) {
 141                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
 142                 mt_srand( $seed );
 143                 $wgRandomSeeded = true;
 144         }
 145 }
 146
 147 /**
 148  * Get a random decimal value between 0 and 1, in a way
 149  * not likely to give duplicate values for any realistic
 150  * number of articles.
 151  *
 152  * @return string
 153  */
 154 function wfRandom() {
 155         # The maximum random value is "only" 2^31-1, so get two random
 156         # values to reduce the chance of dupes
 157         $max = mt_getrandmax();
 158         $rand = number_format( (mt_rand() * $max + mt_rand())
 159                 / $max / $max, 12, '.', '' );
 160         return $rand;
 161 }
 162
 163 /**
 164  * We want / and : to be included as literal characters in our title URLs.
 165  * %2F in the page titles seems to fatally break for some reason.
 166  *
 167  * @param $s String:
 168  * @return string
 169 */
 170 function wfUrlencode ( $s ) {
 171         $s = urlencode( $s );
 172         $s = preg_replace( '/%3[Aa]/', ':', $s );
 173         $s = preg_replace( '/%2[Ff]/', '/', $s );
 174
 175         return $s;
 176 }
 177
 178 /**
 179  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 180  * In normal operation this is a NOP.
 181  *
 182  * Controlling globals:
 183  * $wgDebugLogFile - points to the log file
 184  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 185  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 186  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 187  *
 188  * @param $text String
 189  * @param $logonly Bool: set true to avoid appearing in HTML when $wgDebugComments is set
 190  */
 191 function wfDebug( $text, $logonly = false ) {
 192         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 193
 194         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 195         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 196                 return;
 197         }
 198
 199         if ( isset( $wgOut ) && $wgDebugComments && !$logonly ) {
 200                 $wgOut->debug( $text );
 201         }
 202         if ( '' != $wgDebugLogFile && !$wgProfileOnly ) {
 203                 # Strip unprintables; they can switch terminal modes when binary data
 204                 # gets dumped, which is pretty annoying.
 205                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 206                 @error_log( $text, 3, $wgDebugLogFile );
 207         }
 208 }
 209
 210 /**
 211  * Send a line to a supplementary debug log file, if configured, or main debug log if not.
 212  * $wgDebugLogGroups[$logGroup] should be set to a filename to send to a separate log.
 213  *
 214  * @param $logGroup String
 215  * @param $text String
 216  * @param $public Bool: whether to log the event in the public log if no private
 217  *                     log file is specified, (default true)
 218  */
 219 function wfDebugLog( $logGroup, $text, $public = true ) {
 220         global $wgDebugLogGroups, $wgDBname;
 221         if( $text{strlen( $text ) - 1} != "\n" ) $text .= "\n";
 222         if( isset( $wgDebugLogGroups[$logGroup] ) ) {
 223                 $time = wfTimestamp( TS_DB );
 224                 @error_log( "$time $wgDBname: $text", 3, $wgDebugLogGroups[$logGroup] );
 225         } else if ( $public === true ) {
 226                 wfDebug( $text, true );
 227         }
 228 }
 229
 230 /**
 231  * Log for database errors
 232  * @param $text String: database error message.
 233  */
 234 function wfLogDBError( $text ) {
 235         global $wgDBerrorLog;
 236         if ( $wgDBerrorLog ) {
 237                 $host = trim(`hostname`);
 238                 $text = date('D M j G:i:s T Y') . "\t$host\t".$text;
 239                 error_log( $text, 3, $wgDBerrorLog );
 240         }
 241 }
 242
 243 /**
 244  * @todo document
 245  */
 246 function wfLogProfilingData() {
 247         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 248         global $wgProfiling, $wgUser;
 249         if ( $wgProfiling ) {
 250                 $now = wfTime();
 251                 $elapsed = $now - $wgRequestTime;
 252                 $prof = wfGetProfilingOutput( $wgRequestTime, $elapsed );
 253                 $forward = '';
 254                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 255                         $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 256                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 257                         $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 258                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 259                         $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 260                 if( $forward )
 261                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 262                 // Don't unstub $wgUser at this late stage just for statistics purposes
 263                 if( StubObject::isRealObject($wgUser) && $wgUser->isAnon() )
 264                         $forward .= ' anon';
 265                 $log = sprintf( "%s\t%04.3f\t%s\n",
 266                   gmdate( 'YmdHis' ), $elapsed,
 267                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 268                 if ( '' != $wgDebugLogFile && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 269                         error_log( $log . $prof, 3, $wgDebugLogFile );
 270                 }
 271         }
 272 }
 273
 274 /**
 275  * Check if the wiki read-only lock file is present. This can be used to lock
 276  * off editing functions, but doesn't guarantee that the database will not be
 277  * modified.
 278  * @return bool
 279  */
 280 function wfReadOnly() {
 281         global $wgReadOnlyFile, $wgReadOnly;
 282
 283         if ( !is_null( $wgReadOnly ) ) {
 284                 return (bool)$wgReadOnly;
 285         }
 286         if ( '' == $wgReadOnlyFile ) {
 287                 return false;
 288         }
 289         // Set $wgReadOnly for faster access next time
 290         if ( is_file( $wgReadOnlyFile ) ) {
 291                 $wgReadOnly = file_get_contents( $wgReadOnlyFile );
 292         } else {
 293                 $wgReadOnly = false;
 294         }
 295         return (bool)$wgReadOnly;
 296 }
 297
 298
 299 /**
 300  * Get a message from anywhere, for the current user language.
 301  *
 302  * Use wfMsgForContent() instead if the message should NOT
 303  * change depending on the user preferences.
 304  *
 305  * Note that the message may contain HTML, and is therefore
 306  * not safe for insertion anywhere. Some functions such as
 307  * addWikiText will do the escaping for you. Use wfMsgHtml()
 308  * if you need an escaped message.
 309  *
 310  * @param $key String: lookup key for the message, usually
 311  *    defined in languages/Language.php
 312  */
 313 function wfMsg( $key ) {
 314         $args = func_get_args();
 315         array_shift( $args );
 316         return wfMsgReal( $key, $args, true );
 317 }
 318
 319 /**
 320  * Same as above except doesn't transform the message
 321  */
 322 function wfMsgNoTrans( $key ) {
 323         $args = func_get_args();
 324         array_shift( $args );
 325         return wfMsgReal( $key, $args, true, false );
 326 }
 327
 328 /**
 329  * Get a message from anywhere, for the current global language
 330  * set with $wgLanguageCode.
 331  *
 332  * Use this if the message should NOT change  dependent on the
 333  * language set in the user's preferences. This is the case for
 334  * most text written into logs, as well as link targets (such as
 335  * the name of the copyright policy page). Link titles, on the
 336  * other hand, should be shown in the UI language.
 337  *
 338  * Note that MediaWiki allows users to change the user interface
 339  * language in their preferences, but a single installation
 340  * typically only contains content in one language.
 341  *
 342  * Be wary of this distinction: If you use wfMsg() where you should
 343  * use wfMsgForContent(), a user of the software may have to
 344  * customize over 70 messages in order to, e.g., fix a link in every
 345  * possible language.
 346  *
 347  * @param $key String: lookup key for the message, usually
 348  *    defined in languages/Language.php
 349  */
 350 function wfMsgForContent( $key ) {
 351         global $wgForceUIMsgAsContentMsg;
 352         $args = func_get_args();
 353         array_shift( $args );
 354         $forcontent = true;
 355         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 356                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 357                 $forcontent = false;
 358         return wfMsgReal( $key, $args, true, $forcontent );
 359 }
 360
 361 /**
 362  * Same as above except doesn't transform the message
 363  */
 364 function wfMsgForContentNoTrans( $key ) {
 365         global $wgForceUIMsgAsContentMsg;
 366         $args = func_get_args();
 367         array_shift( $args );
 368         $forcontent = true;
 369         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 370                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 371                 $forcontent = false;
 372         return wfMsgReal( $key, $args, true, $forcontent, false );
 373 }
 374
 375 /**
 376  * Get a message from the language file, for the UI elements
 377  */
 378 function wfMsgNoDB( $key ) {
 379         $args = func_get_args();
 380         array_shift( $args );
 381         return wfMsgReal( $key, $args, false );
 382 }
 383
 384 /**
 385  * Get a message from the language file, for the content
 386  */
 387 function wfMsgNoDBForContent( $key ) {
 388         global $wgForceUIMsgAsContentMsg;
 389         $args = func_get_args();
 390         array_shift( $args );
 391         $forcontent = true;
 392         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 393                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 394                 $forcontent = false;
 395         return wfMsgReal( $key, $args, false, $forcontent );
 396 }
 397
 398
 399 /**
 400  * Really get a message
 401  * @return $key String: key to get.
 402  * @return $args
 403  * @return $useDB Boolean
 404  * @return String: the requested message.
 405  */
 406 function wfMsgReal( $key, $args, $useDB = true, $forContent=false, $transform = true ) {
 407         $fname = 'wfMsgReal';
 408
 409         $message = wfMsgGetKey( $key, $useDB, $forContent, $transform );
 410         $message = wfMsgReplaceArgs( $message, $args );
 411         return $message;
 412 }
 413
 414 /**
 415  * This function provides the message source for messages to be edited which are *not* stored in the database.
 416  * @param $key String:
 417  */
 418 function wfMsgWeirdKey ( $key ) {
 419         $subsource = str_replace ( ' ' , '_' , $key ) ;
 420         $source = wfMsgForContentNoTrans( $subsource ) ;
 421         if ( $source == "&lt;{$subsource}&gt;" ) {
 422                 # Try again with first char lower case
 423                 $subsource = strtolower ( substr ( $subsource , 0 , 1 ) ) . substr ( $subsource , 1 ) ;
 424                 $source = wfMsgForContentNoTrans( $subsource ) ;
 425         }
 426         if ( $source == "&lt;{$subsource}&gt;" ) {
 427                 # Didn't work either, return blank text
 428                 $source = "" ;
 429         }
 430         return $source ;
 431 }
 432
 433 /**
 434  * Fetch a message string value, but don't replace any keys yet.
 435  * @param string $key
 436  * @param bool $useDB
 437  * @param bool $forContent
 438  * @return string
 439  * @private
 440  */
 441 function wfMsgGetKey( $key, $useDB, $forContent = false, $transform = true ) {
 442         global $wgParser, $wgContLang, $wgMessageCache, $wgLang;
 443
 444         if ( is_object( $wgMessageCache ) )
 445                 $transstat = $wgMessageCache->getTransform();
 446
 447         if( is_object( $wgMessageCache ) ) {
 448                 if ( ! $transform )
 449                         $wgMessageCache->disableTransform();
 450                 $message = $wgMessageCache->get( $key, $useDB, $forContent );
 451         } else {
 452                 if( $forContent ) {
 453                         $lang = &$wgContLang;
 454                 } else {
 455                         $lang = &$wgLang;
 456                 }
 457
 458                 wfSuppressWarnings();
 459
 460                 if( is_object( $lang ) ) {
 461                         $message = $lang->getMessage( $key );
 462                 } else {
 463                         $message = false;
 464                 }
 465                 wfRestoreWarnings();
 466                 if($message === false)
 467                         $message = Language::getMessage($key);
 468                 if ( $transform && strstr( $message, '{{' ) !== false ) {
 469                         $message = $wgParser->transformMsg($message, $wgMessageCache->getParserOptions() );
 470                 }
 471         }
 472
 473         if ( is_object( $wgMessageCache ) && ! $transform )
 474                 $wgMessageCache->setTransform( $transstat );
 475
 476         return $message;
 477 }
 478
 479 /**
 480  * Replace message parameter keys on the given formatted output.
 481  *
 482  * @param string $message
 483  * @param array $args
 484  * @return string
 485  * @private
 486  */
 487 function wfMsgReplaceArgs( $message, $args ) {
 488         # Fix windows line-endings
 489         # Some messages are split with explode("\n", $msg)
 490         $message = str_replace( "\r", '', $message );
 491
 492         // Replace arguments
 493         if ( count( $args ) ) {
 494                 if ( is_array( $args[0] ) ) {
 495                         foreach ( $args[0] as $key => $val ) {
 496                                 $message = str_replace( '$' . $key, $val, $message );
 497                         }
 498                 } else {
 499                         foreach( $args as $n => $param ) {
 500                                 $replacementKeys['$' . ($n + 1)] = $param;
 501                         }
 502                         $message = strtr( $message, $replacementKeys );
 503                 }
 504         }
 505
 506         return $message;
 507 }
 508
 509 /**
 510  * Return an HTML-escaped version of a message.
 511  * Parameter replacements, if any, are done *after* the HTML-escaping,
 512  * so parameters may contain HTML (eg links or form controls). Be sure
 513  * to pre-escape them if you really do want plaintext, or just wrap
 514  * the whole thing in htmlspecialchars().
 515  *
 516  * @param string $key
 517  * @param string ... parameters
 518  * @return string
 519  */
 520 function wfMsgHtml( $key ) {
 521         $args = func_get_args();
 522         array_shift( $args );
 523         return wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $key, true ) ), $args );
 524 }
 525
 526 /**
 527  * Return an HTML version of message
 528  * Parameter replacements, if any, are done *after* parsing the wiki-text message,
 529  * so parameters may contain HTML (eg links or form controls). Be sure
 530  * to pre-escape them if you really do want plaintext, or just wrap
 531  * the whole thing in htmlspecialchars().
 532  *
 533  * @param string $key
 534  * @param string ... parameters
 535  * @return string
 536  */
 537 function wfMsgWikiHtml( $key ) {
 538         global $wgOut;
 539         $args = func_get_args();
 540         array_shift( $args );
 541         return wfMsgReplaceArgs( $wgOut->parse( wfMsgGetKey( $key, true ), /* can't be set to false */ true ), $args );
 542 }
 543
 544 /**
 545  * Returns message in the requested format
 546  * @param string $key Key of the message
 547  * @param array $options Processing rules:
 548  *  <i>parse<i>: parses wikitext to html
 549  *  <i>parseinline<i>: parses wikitext to html and removes the surrounding p's added by parser or tidy
 550  *  <i>escape<i>: filters message trough htmlspecialchars
 551  *  <i>replaceafter<i>: parameters are substituted after parsing or escaping
 552  */
 553 function wfMsgExt( $key, $options ) {
 554         global $wgOut, $wgMsgParserOptions, $wgParser;
 555
 556         $args = func_get_args();
 557         array_shift( $args );
 558         array_shift( $args );
 559
 560         if( !is_array($options) ) {
 561                 $options = array($options);
 562         }
 563
 564         $string = wfMsgGetKey( $key, true, false, false );
 565
 566         if( !in_array('replaceafter', $options) ) {
 567                 $string = wfMsgReplaceArgs( $string, $args );
 568         }
 569
 570         if( in_array('parse', $options) ) {
 571                 $string = $wgOut->parse( $string, true, true );
 572         } elseif ( in_array('parseinline', $options) ) {
 573                 $string = $wgOut->parse( $string, true, true );
 574                 $m = array();
 575                 if( preg_match( "~^<p>(.*)\n?</p>$~", $string, $m ) ) {
 576                         $string = $m[1];
 577                 }
 578         } elseif ( in_array('parsemag', $options) ) {
 579                 global $wgTitle;
 580                 $parser = new Parser();
 581                 $parserOptions = new ParserOptions();
 582                 $parserOptions->setInterfaceMessage( true );
 583                 $parser->startExternalParse( $wgTitle, $parserOptions, OT_MSG );
 584                 $string = $parser->transformMsg( $string, $parserOptions );
 585         }
 586
 587         if ( in_array('escape', $options) ) {
 588                 $string = htmlspecialchars ( $string );
 589         }
 590
 591         if( in_array('replaceafter', $options) ) {
 592                 $string = wfMsgReplaceArgs( $string, $args );
 593         }
 594
 595         return $string;
 596 }
 597
 598
 599 /**
 600  * Just like exit() but makes a note of it.
 601  * Commits open transactions except if the error parameter is set
 602  *
 603  * @obsolete Please return control to the caller or throw an exception
 604  */
 605 function wfAbruptExit( $error = false ){
 606         global $wgLoadBalancer;
 607         static $called = false;
 608         if ( $called ){
 609                 exit( -1 );
 610         }
 611         $called = true;
 612
 613         if( function_exists( 'debug_backtrace' ) ){ // PHP >= 4.3
 614                 $bt = debug_backtrace();
 615                 for($i = 0; $i < count($bt) ; $i++){
 616                         $file = isset($bt[$i]['file']) ? $bt[$i]['file'] : "unknown";
 617                         $line = isset($bt[$i]['line']) ? $bt[$i]['line'] : "unknown";
 618                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 619                 }
 620         } else {
 621                 wfDebug('WARNING: Abrupt exit\n');
 622         }
 623
 624         wfLogProfilingData();
 625
 626         if ( !$error ) {
 627                 $wgLoadBalancer->closeAll();
 628         }
 629         exit( -1 );
 630 }
 631
 632 /**
 633  * @obsolete Please return control the caller or throw an exception
 634  */
 635 function wfErrorExit() {
 636         wfAbruptExit( true );
 637 }
 638
 639 /**
 640  * Print a simple message and die, returning nonzero to the shell if any.
 641  * Plain die() fails to return nonzero to the shell if you pass a string.
 642  * @param string $msg
 643  */
 644 function wfDie( $msg='' ) {
 645         echo $msg;
 646         die( 1 );
 647 }
 648
 649 /**
 650  * Throw a debugging exception. This function previously once exited the process,
 651  * but now throws an exception instead, with similar results.
 652  *
 653  * @param string $msg Message shown when dieing.
 654  */
 655 function wfDebugDieBacktrace( $msg = '' ) {
 656         throw new MWException( $msg );
 657 }
 658
 659 /**
 660  * Fetch server name for use in error reporting etc.
 661  * Use real server name if available, so we know which machine
 662  * in a server farm generated the current page.
 663  * @return string
 664  */
 665 function wfHostname() {
 666         if ( function_exists( 'posix_uname' ) ) {
 667                 // This function not present on Windows
 668                 $uname = @posix_uname();
 669         } else {
 670                 $uname = false;
 671         }
 672         if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 673                 return $uname['nodename'];
 674         } else {
 675                 # This may be a virtual server.
 676                 return $_SERVER['SERVER_NAME'];
 677         }
 678 }
 679
 680         /**
 681          * Returns a HTML comment with the elapsed time since request.
 682          * This method has no side effects.
 683          * @return string
 684          */
 685         function wfReportTime() {
 686                 global $wgRequestTime;
 687
 688                 $now = wfTime();
 689                 $elapsed = $now - $wgRequestTime;
 690
 691                 $com = sprintf( "<!-- Served by %s in %01.3f secs. -->",
 692                   wfHostname(), $elapsed );
 693                 return $com;
 694         }
 695
 696 function wfBacktrace() {
 697         global $wgCommandLineMode;
 698         if ( !function_exists( 'debug_backtrace' ) ) {
 699                 return false;
 700         }
 701
 702         if ( $wgCommandLineMode ) {
 703                 $msg = '';
 704         } else {
 705                 $msg = "<ul>\n";
 706         }
 707         $backtrace = debug_backtrace();
 708         foreach( $backtrace as $call ) {
 709                 if( isset( $call['file'] ) ) {
 710                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 711                         $file = $f[count($f)-1];
 712                 } else {
 713                         $file = '-';
 714                 }
 715                 if( isset( $call['line'] ) ) {
 716                         $line = $call['line'];
 717                 } else {
 718                         $line = '-';
 719                 }
 720                 if ( $wgCommandLineMode ) {
 721                         $msg .= "$file line $line calls ";
 722                 } else {
 723                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
 724                 }
 725                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 726                 $msg .= $call['function'] . '()';
 727
 728                 if ( $wgCommandLineMode ) {
 729                         $msg .= "\n";
 730                 } else {
 731                         $msg .= "</li>\n";
 732                 }
 733         }
 734         if ( $wgCommandLineMode ) {
 735                 $msg .= "\n";
 736         } else {
 737                 $msg .= "</ul>\n";
 738         }
 739
 740         return $msg;
 741 }
 742
 743
 744 /* Some generic result counters, pulled out of SearchEngine */
 745
 746
 747 /**
 748  * @todo document
 749  */
 750 function wfShowingResults( $offset, $limit ) {
 751         global $wgLang;
 752         return wfMsg( 'showingresults', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 753 }
 754
 755 /**
 756  * @todo document
 757  */
 758 function wfShowingResultsNum( $offset, $limit, $num ) {
 759         global $wgLang;
 760         return wfMsg( 'showingresultsnum', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 761 }
 762
 763 /**
 764  * @todo document
 765  */
 766 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
 767         global $wgLang;
 768         $fmtLimit = $wgLang->formatNum( $limit );
 769         $prev = wfMsg( 'prevn', $fmtLimit );
 770         $next = wfMsg( 'nextn', $fmtLimit );
 771
 772         if( is_object( $link ) ) {
 773                 $title =& $link;
 774         } else {
 775                 $title = Title::newFromText( $link );
 776                 if( is_null( $title ) ) {
 777                         return false;
 778                 }
 779         }
 780
 781         if ( 0 != $offset ) {
 782                 $po = $offset - $limit;
 783                 if ( $po < 0 ) { $po = 0; }
 784                 $q = "limit={$limit}&offset={$po}";
 785                 if ( '' != $query ) { $q .= '&'.$query; }
 786                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$prev}</a>";
 787         } else { $plink = $prev; }
 788
 789         $no = $offset + $limit;
 790         $q = 'limit='.$limit.'&offset='.$no;
 791         if ( '' != $query ) { $q .= '&'.$query; }
 792
 793         if ( $atend ) {
 794                 $nlink = $next;
 795         } else {
 796                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$next}</a>";
 797         }
 798         $nums = wfNumLink( $offset, 20, $title, $query ) . ' | ' .
 799           wfNumLink( $offset, 50, $title, $query ) . ' | ' .
 800           wfNumLink( $offset, 100, $title, $query ) . ' | ' .
 801           wfNumLink( $offset, 250, $title, $query ) . ' | ' .
 802           wfNumLink( $offset, 500, $title, $query );
 803
 804         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 805 }
 806
 807 /**
 808  * @todo document
 809  */
 810 function wfNumLink( $offset, $limit, &$title, $query = '' ) {
 811         global $wgLang;
 812         if ( '' == $query ) { $q = ''; }
 813         else { $q = $query.'&'; }
 814         $q .= 'limit='.$limit.'&offset='.$offset;
 815
 816         $fmtLimit = $wgLang->formatNum( $limit );
 817         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$fmtLimit}</a>";
 818         return $s;
 819 }
 820
 821 /**
 822  * @todo document
 823  * @todo FIXME: we may want to blacklist some broken browsers
 824  *
 825  * @return bool Whereas client accept gzip compression
 826  */
 827 function wfClientAcceptsGzip() {
 828         global $wgUseGzip;
 829         if( $wgUseGzip ) {
 830                 # FIXME: we may want to blacklist some broken browsers
 831                 if( preg_match(
 832                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 833                         $_SERVER['HTTP_ACCEPT_ENCODING'],
 834                         $m ) ) {
 835                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
 836                         wfDebug( " accepts gzip\n" );
 837                         return true;
 838                 }
 839         }
 840         return false;
 841 }
 842
 843 /**
 844  * Obtain the offset and limit values from the request string;
 845  * used in special pages
 846  *
 847  * @param $deflimit Default limit if none supplied
 848  * @param $optionname Name of a user preference to check against
 849  * @return array
 850  *
 851  */
 852 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
 853         global $wgRequest;
 854         return $wgRequest->getLimitOffset( $deflimit, $optionname );
 855 }
 856
 857 /**
 858  * Escapes the given text so that it may be output using addWikiText()
 859  * without any linking, formatting, etc. making its way through. This
 860  * is achieved by substituting certain characters with HTML entities.
 861  * As required by the callers, <nowiki> is not used. It currently does
 862  * not filter out characters which have special meaning only at the
 863  * start of a line, such as "*".
 864  *
 865  * @param string $text Text to be escaped
 866  */
 867 function wfEscapeWikiText( $text ) {
 868         $text = str_replace(
 869                 array( '[',     '|',      '\'',    'ISBN ',     'RFC ',     '://',     "\n=",     '{{' ),
 870                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', 'RFC&#32;', '&#58;//', "\n&#61;", '&#123;&#123;' ),
 871                 htmlspecialchars($text) );
 872         return $text;
 873 }
 874
 875 /**
 876  * @todo document
 877  */
 878 function wfQuotedPrintable( $string, $charset = '' ) {
 879         # Probably incomplete; see RFC 2045
 880         if( empty( $charset ) ) {
 881                 global $wgInputEncoding;
 882                 $charset = $wgInputEncoding;
 883         }
 884         $charset = strtoupper( $charset );
 885         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
 886
 887         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 888         $replace = $illegal . '\t ?_';
 889         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 890         $out = "=?$charset?Q?";
 891         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 892         $out .= '?=';
 893         return $out;
 894 }
 895
 896
 897 /**
 898  * @todo document
 899  * @return float
 900  */
 901 function wfTime() {
 902         return microtime(true);
 903 }
 904
 905 /**
 906  * Sets dest to source and returns the original value of dest
 907  * If source is NULL, it just returns the value, it doesn't set the variable
 908  */
 909 function wfSetVar( &$dest, $source ) {
 910         $temp = $dest;
 911         if ( !is_null( $source ) ) {
 912                 $dest = $source;
 913         }
 914         return $temp;
 915 }
 916
 917 /**
 918  * As for wfSetVar except setting a bit
 919  */
 920 function wfSetBit( &$dest, $bit, $state = true ) {
 921         $temp = (bool)($dest & $bit );
 922         if ( !is_null( $state ) ) {
 923                 if ( $state ) {
 924                         $dest |= $bit;
 925                 } else {
 926                         $dest &= ~$bit;
 927                 }
 928         }
 929         return $temp;
 930 }
 931
 932 /**
 933  * This function takes two arrays as input, and returns a CGI-style string, e.g.
 934  * "days=7&limit=100". Options in the first array override options in the second.
 935  * Options set to "" will not be output.
 936  */
 937 function wfArrayToCGI( $array1, $array2 = NULL )
 938 {
 939         if ( !is_null( $array2 ) ) {
 940                 $array1 = $array1 + $array2;
 941         }
 942
 943         $cgi = '';
 944         foreach ( $array1 as $key => $value ) {
 945                 if ( '' !== $value ) {
 946                         if ( '' != $cgi ) {
 947                                 $cgi .= '&';
 948                         }
 949                         $cgi .= urlencode( $key ) . '=' . urlencode( $value );
 950                 }
 951         }
 952         return $cgi;
 953 }
 954
 955 /**
 956  * This is obsolete, use SquidUpdate::purge()
 957  * @deprecated
 958  */
 959 function wfPurgeSquidServers ($urlArr) {
 960         SquidUpdate::purge( $urlArr );
 961 }
 962
 963 /**
 964  * Windows-compatible version of escapeshellarg()
 965  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
 966  * function puts single quotes in regardless of OS
 967  */
 968 function wfEscapeShellArg( ) {
 969         $args = func_get_args();
 970         $first = true;
 971         $retVal = '';
 972         foreach ( $args as $arg ) {
 973                 if ( !$first ) {
 974                         $retVal .= ' ';
 975                 } else {
 976                         $first = false;
 977                 }
 978
 979                 if ( wfIsWindows() ) {
 980                         // Escaping for an MSVC-style command line parser
 981                         // Ref: http://mailman.lyra.org/pipermail/scite-interest/2002-March/000436.html
 982                         // Double the backslashes before any double quotes. Escape the double quotes.
 983                         $tokens = preg_split( '/(\\\\*")/', $arg, -1, PREG_SPLIT_DELIM_CAPTURE );
 984                         $arg = '';
 985                         $delim = false;
 986                         foreach ( $tokens as $token ) {
 987                                 if ( $delim ) {
 988                                         $arg .= str_replace( '\\', '\\\\', substr( $token, 0, -1 ) ) . '\\"';
 989                                 } else {
 990                                         $arg .= $token;
 991                                 }
 992                                 $delim = !$delim;
 993                         }
 994                         // Double the backslashes before the end of the string, because
 995                         // we will soon add a quote
 996                         if ( preg_match( '/^(.*?)(\\\\+)$/', $arg, $m ) ) {
 997                                 $arg = $m[1] . str_replace( '\\', '\\\\', $m[2] );
 998                         }
 999
1000                         // Add surrounding quotes
1001                         $retVal .= '"' . $arg . '"';
1002                 } else {
1003                         $retVal .= escapeshellarg( $arg );
1004                 }
1005         }
1006         return $retVal;
1007 }
1008
1009 /**
1010  * wfMerge attempts to merge differences between three texts.
1011  * Returns true for a clean merge and false for failure or a conflict.
1012  */
1013 function wfMerge( $old, $mine, $yours, &$result ){
1014         global $wgDiff3;
1015
1016         # This check may also protect against code injection in
1017         # case of broken installations.
1018         if(! file_exists( $wgDiff3 ) ){
1019                 wfDebug( "diff3 not found\n" );
1020                 return false;
1021         }
1022
1023         # Make temporary files
1024         $td = wfTempDir();
1025         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1026         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
1027         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
1028
1029         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
1030         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
1031         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
1032
1033         # Check for a conflict
1034         $cmd = $wgDiff3 . ' -a --overlap-only ' .
1035           wfEscapeShellArg( $mytextName ) . ' ' .
1036           wfEscapeShellArg( $oldtextName ) . ' ' .
1037           wfEscapeShellArg( $yourtextName );
1038         $handle = popen( $cmd, 'r' );
1039
1040         if( fgets( $handle, 1024 ) ){
1041                 $conflict = true;
1042         } else {
1043                 $conflict = false;
1044         }
1045         pclose( $handle );
1046
1047         # Merge differences
1048         $cmd = $wgDiff3 . ' -a -e --merge ' .
1049           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
1050         $handle = popen( $cmd, 'r' );
1051         $result = '';
1052         do {
1053                 $data = fread( $handle, 8192 );
1054                 if ( strlen( $data ) == 0 ) {
1055                         break;
1056                 }
1057                 $result .= $data;
1058         } while ( true );
1059         pclose( $handle );
1060         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
1061
1062         if ( $result === '' && $old !== '' && $conflict == false ) {
1063                 wfDebug( "Unexpected null result from diff3. Command: $cmd\n" );
1064                 $conflict = true;
1065         }
1066         return ! $conflict;
1067 }
1068
1069 /**
1070  * @todo document
1071  */
1072 function wfVarDump( $var ) {
1073         global $wgOut;
1074         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
1075         if ( headers_sent() || !@is_object( $wgOut ) ) {
1076                 print $s;
1077         } else {
1078                 $wgOut->addHTML( $s );
1079         }
1080 }
1081
1082 /**
1083  * Provide a simple HTTP error.
1084  */
1085 function wfHttpError( $code, $label, $desc ) {
1086         global $wgOut;
1087         $wgOut->disable();
1088         header( "HTTP/1.0 $code $label" );
1089         header( "Status: $code $label" );
1090         $wgOut->sendCacheControl();
1091
1092         header( 'Content-type: text/html' );
1093         print "<html><head><title>" .
1094                 htmlspecialchars( $label ) .
1095                 "</title></head><body><h1>" .
1096                 htmlspecialchars( $label ) .
1097                 "</h1><p>" .
1098                 htmlspecialchars( $desc ) .
1099                 "</p></body></html>\n";
1100 }
1101
1102 /**
1103  * Converts an Accept-* header into an array mapping string values to quality
1104  * factors
1105  */
1106 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
1107         # No arg means accept anything (per HTTP spec)
1108         if( !$accept ) {
1109                 return array( $def => 1 );
1110         }
1111
1112         $prefs = array();
1113
1114         $parts = explode( ',', $accept );
1115
1116         foreach( $parts as $part ) {
1117                 # FIXME: doesn't deal with params like 'text/html; level=1'
1118                 @list( $value, $qpart ) = explode( ';', $part );
1119                 if( !isset( $qpart ) ) {
1120                         $prefs[$value] = 1;
1121                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
1122                         $prefs[$value] = $match[1];
1123                 }
1124         }
1125
1126         return $prefs;
1127 }
1128
1129 /**
1130  * Checks if a given MIME type matches any of the keys in the given
1131  * array. Basic wildcards are accepted in the array keys.
1132  *
1133  * Returns the matching MIME type (or wildcard) if a match, otherwise
1134  * NULL if no match.
1135  *
1136  * @param string $type
1137  * @param array $avail
1138  * @return string
1139  * @private
1140  */
1141 function mimeTypeMatch( $type, $avail ) {
1142         if( array_key_exists($type, $avail) ) {
1143                 return $type;
1144         } else {
1145                 $parts = explode( '/', $type );
1146                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
1147                         return $parts[0] . '/*';
1148                 } elseif( array_key_exists( '*/*', $avail ) ) {
1149                         return '*/*';
1150                 } else {
1151                         return NULL;
1152                 }
1153         }
1154 }
1155
1156 /**
1157  * Returns the 'best' match between a client's requested internet media types
1158  * and the server's list of available types. Each list should be an associative
1159  * array of type to preference (preference is a float between 0.0 and 1.0).
1160  * Wildcards in the types are acceptable.
1161  *
1162  * @param array $cprefs Client's acceptable type list
1163  * @param array $sprefs Server's offered types
1164  * @return string
1165  *
1166  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
1167  * XXX: generalize to negotiate other stuff
1168  */
1169 function wfNegotiateType( $cprefs, $sprefs ) {
1170         $combine = array();
1171
1172         foreach( array_keys($sprefs) as $type ) {
1173                 $parts = explode( '/', $type );
1174                 if( $parts[1] != '*' ) {
1175                         $ckey = mimeTypeMatch( $type, $cprefs );
1176                         if( $ckey ) {
1177                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1178                         }
1179                 }
1180         }
1181
1182         foreach( array_keys( $cprefs ) as $type ) {
1183                 $parts = explode( '/', $type );
1184                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
1185                         $skey = mimeTypeMatch( $type, $sprefs );
1186                         if( $skey ) {
1187                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1188                         }
1189                 }
1190         }
1191
1192         $bestq = 0;
1193         $besttype = NULL;
1194
1195         foreach( array_keys( $combine ) as $type ) {
1196                 if( $combine[$type] > $bestq ) {
1197                         $besttype = $type;
1198                         $bestq = $combine[$type];
1199                 }
1200         }
1201
1202         return $besttype;
1203 }
1204
1205 /**
1206  * Array lookup
1207  * Returns an array where the values in the first array are replaced by the
1208  * values in the second array with the corresponding keys
1209  *
1210  * @return array
1211  */
1212 function wfArrayLookup( $a, $b ) {
1213         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
1214 }
1215
1216 /**
1217  * Convenience function; returns MediaWiki timestamp for the present time.
1218  * @return string
1219  */
1220 function wfTimestampNow() {
1221         # return NOW
1222         return wfTimestamp( TS_MW, time() );
1223 }
1224
1225 /**
1226  * Reference-counted warning suppression
1227  */
1228 function wfSuppressWarnings( $end = false ) {
1229         static $suppressCount = 0;
1230         static $originalLevel = false;
1231
1232         if ( $end ) {
1233                 if ( $suppressCount ) {
1234                         --$suppressCount;
1235                         if ( !$suppressCount ) {
1236                                 error_reporting( $originalLevel );
1237                         }
1238                 }
1239         } else {
1240                 if ( !$suppressCount ) {
1241                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
1242                 }
1243                 ++$suppressCount;
1244         }
1245 }
1246
1247 /**
1248  * Restore error level to previous value
1249  */
1250 function wfRestoreWarnings() {
1251         wfSuppressWarnings( true );
1252 }
1253
1254 # Autodetect, convert and provide timestamps of various types
1255
1256 /**
1257  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1258  */
1259 define('TS_UNIX', 0);
1260
1261 /**
1262  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1263  */
1264 define('TS_MW', 1);
1265
1266 /**
1267  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1268  */
1269 define('TS_DB', 2);
1270
1271 /**
1272  * RFC 2822 format, for E-mail and HTTP headers
1273  */
1274 define('TS_RFC2822', 3);
1275
1276 /**
1277  * ISO 8601 format with no timezone: 1986-02-09T20:00:00Z
1278  *
1279  * This is used by Special:Export
1280  */
1281 define('TS_ISO_8601', 4);
1282
1283 /**
1284  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1285  *
1286  * @url http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1287  *       DateTime tag and page 36 for the DateTimeOriginal and
1288  *       DateTimeDigitized tags.
1289  */
1290 define('TS_EXIF', 5);
1291
1292 /**
1293  * Oracle format time.
1294  */
1295 define('TS_ORACLE', 6);
1296
1297 /**
1298  * Postgres format time.
1299  */
1300 define('TS_POSTGRES', 7);
1301
1302 /**
1303  * @param mixed $outputtype A timestamp in one of the supported formats, the
1304  *                          function will autodetect which format is supplied
1305  *                          and act accordingly.
1306  * @return string Time in the format specified in $outputtype
1307  */
1308 function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
1309         $uts = 0;
1310         $da = array();
1311         if ($ts==0) {
1312                 $uts=time();
1313         } elseif (preg_match("/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D",$ts,$da)) {
1314                 # TS_DB
1315                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1316                             (int)$da[2],(int)$da[3],(int)$da[1]);
1317         } elseif (preg_match("/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D",$ts,$da)) {
1318                 # TS_EXIF
1319                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1320                         (int)$da[2],(int)$da[3],(int)$da[1]);
1321         } elseif (preg_match("/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D",$ts,$da)) {
1322                 # TS_MW
1323                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1324                             (int)$da[2],(int)$da[3],(int)$da[1]);
1325         } elseif (preg_match("/^(\d{1,13})$/D",$ts,$datearray)) {
1326                 # TS_UNIX
1327                 $uts = $ts;
1328         } elseif (preg_match('/^(\d{1,2})-(...)-(\d\d(\d\d)?) (\d\d)\.(\d\d)\.(\d\d)/', $ts, $da)) {
1329                 # TS_ORACLE
1330                 $uts = strtotime(preg_replace('/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
1331                                 str_replace("+00:00", "UTC", $ts)));
1332         } elseif (preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})Z$/', $ts, $da)) {
1333                 # TS_ISO_8601
1334                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1335                         (int)$da[2],(int)$da[3],(int)$da[1]);
1336         } elseif (preg_match("/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)[\+\- ](\d\d)$/",$ts,$da)) {
1337                 # TS_POSTGRES
1338                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1339                 (int)$da[2],(int)$da[3],(int)$da[1]);
1340         } else {
1341                 # Bogus value; fall back to the epoch...
1342                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1343                 $uts = 0;
1344         }
1345
1346
1347         switch($outputtype) {
1348                 case TS_UNIX:
1349                         return $uts;
1350                 case TS_MW:
1351                         return gmdate( 'YmdHis', $uts );
1352                 case TS_DB:
1353                         return gmdate( 'Y-m-d H:i:s', $uts );
1354                 case TS_ISO_8601:
1355                         return gmdate( 'Y-m-d\TH:i:s\Z', $uts );
1356                 // This shouldn't ever be used, but is included for completeness
1357                 case TS_EXIF:
1358                         return gmdate(  'Y:m:d H:i:s', $uts );
1359                 case TS_RFC2822:
1360                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1361                 case TS_ORACLE:
1362                         return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
1363                 case TS_POSTGRES:
1364                         return gmdate( 'Y-m-d H:i:s', $uts) . ' GMT';
1365                 default:
1366                         throw new MWException( 'wfTimestamp() called with illegal output type.');
1367         }
1368 }
1369
1370 /**
1371  * Return a formatted timestamp, or null if input is null.
1372  * For dealing with nullable timestamp columns in the database.
1373  * @param int $outputtype
1374  * @param string $ts
1375  * @return string
1376  */
1377 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1378         if( is_null( $ts ) ) {
1379                 return null;
1380         } else {
1381                 return wfTimestamp( $outputtype, $ts );
1382         }
1383 }
1384
1385 /**
1386  * Check if the operating system is Windows
1387  *
1388  * @return bool True if it's Windows, False otherwise.
1389  */
1390 function wfIsWindows() {
1391         if (substr(php_uname(), 0, 7) == 'Windows') {
1392                 return true;
1393         } else {
1394                 return false;
1395         }
1396 }
1397
1398 /**
1399  * Swap two variables
1400  */
1401 function swap( &$x, &$y ) {
1402         $z = $x;
1403         $x = $y;
1404         $y = $z;
1405 }
1406
1407 function wfGetCachedNotice( $name ) {
1408         global $wgOut, $parserMemc, $wgDBname;
1409         $fname = 'wfGetCachedNotice';
1410         wfProfileIn( $fname );
1411
1412         $needParse = false;
1413         $notice = wfMsgForContent( $name );
1414         if( $notice == '&lt;'. $name . ';&gt' || $notice == '-' ) {
1415                 wfProfileOut( $fname );
1416                 return( false );
1417         }
1418
1419         $cachedNotice = $parserMemc->get( $wgDBname . ':' . $name );
1420         if( is_array( $cachedNotice ) ) {
1421                 if( md5( $notice ) == $cachedNotice['hash'] ) {
1422                         $notice = $cachedNotice['html'];
1423                 } else {
1424                         $needParse = true;
1425                 }
1426         } else {
1427                 $needParse = true;
1428         }
1429
1430         if( $needParse ) {
1431                 if( is_object( $wgOut ) ) {
1432                         $parsed = $wgOut->parse( $notice );
1433                         $parserMemc->set( $wgDBname . ':' . $name, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1434                         $notice = $parsed;
1435                 } else {
1436                         wfDebug( 'wfGetCachedNotice called for ' . $name . ' with no $wgOut available' );
1437                         $notice = '';
1438                 }
1439         }
1440
1441         wfProfileOut( $fname );
1442         return $notice;
1443 }
1444
1445 function wfGetNamespaceNotice() {
1446         global $wgTitle;
1447
1448         # Paranoia
1449         if ( !isset( $wgTitle ) || !is_object( $wgTitle ) )
1450                 return "";
1451
1452         $fname = 'wfGetNamespaceNotice';
1453         wfProfileIn( $fname );
1454
1455         $key = "namespacenotice-" . $wgTitle->getNsText();
1456         $namespaceNotice = wfGetCachedNotice( $key );
1457         if ( $namespaceNotice && substr ( $namespaceNotice , 0 ,7 ) != "<p>&lt;" ) {
1458                  $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . "</div>";
1459         } else {
1460                 $namespaceNotice = "";
1461         }
1462
1463         wfProfileOut( $fname );
1464         return $namespaceNotice;
1465 }
1466
1467 function wfGetSiteNotice() {
1468         global $wgUser, $wgSiteNotice;
1469         $fname = 'wfGetSiteNotice';
1470         wfProfileIn( $fname );
1471         $siteNotice = '';
1472
1473         if( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice ) ) ) {
1474                 if( is_object( $wgUser ) && $wgUser->isLoggedIn() ) {
1475                         $siteNotice = wfGetCachedNotice( 'sitenotice' );
1476                         $siteNotice = !$siteNotice ? $wgSiteNotice : $siteNotice;
1477                 } else {
1478                         $anonNotice = wfGetCachedNotice( 'anonnotice' );
1479                         if( !$anonNotice ) {
1480                                 $siteNotice = wfGetCachedNotice( 'sitenotice' );
1481                                 $siteNotice = !$siteNotice ? $wgSiteNotice : $siteNotice;
1482                         } else {
1483                                 $siteNotice = $anonNotice;
1484                         }
1485                 }
1486         }
1487
1488         wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice ) );
1489         wfProfileOut( $fname );
1490         return $siteNotice;
1491 }
1492
1493 /** Global singleton instance of MimeMagic. This is initialized on demand,
1494 * please always use the wfGetMimeMagic() function to get the instance.
1495 *
1496 * @private
1497 */
1498 $wgMimeMagic= NULL;
1499
1500 /** Factory functions for the global MimeMagic object.
1501 * This function always returns the same singleton instance of MimeMagic.
1502 * That objects will be instantiated on the first call to this function.
1503 * If needed, the MimeMagic.php file is automatically included by this function.
1504 * @return MimeMagic the global MimeMagic objects.
1505 */
1506 function &wfGetMimeMagic() {
1507         global $wgMimeMagic;
1508
1509         if (!is_null($wgMimeMagic)) {
1510                 return $wgMimeMagic;
1511         }
1512
1513         if (!class_exists("MimeMagic")) {
1514                 #include on demand
1515                 require_once("MimeMagic.php");
1516         }
1517
1518         $wgMimeMagic= new MimeMagic();
1519
1520         return $wgMimeMagic;
1521 }
1522
1523
1524 /**
1525  * Tries to get the system directory for temporary files.
1526  * The TMPDIR, TMP, and TEMP environment variables are checked in sequence,
1527  * and if none are set /tmp is returned as the generic Unix default.
1528  *
1529  * NOTE: When possible, use the tempfile() function to create temporary
1530  * files to avoid race conditions on file creation, etc.
1531  *
1532  * @return string
1533  */
1534 function wfTempDir() {
1535         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
1536                 $tmp = getenv( $var );
1537                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
1538                         return $tmp;
1539                 }
1540         }
1541         # Hope this is Unix of some kind!
1542         return '/tmp';
1543 }
1544
1545 /**
1546  * Make directory, and make all parent directories if they don't exist
1547  */
1548 function wfMkdirParents( $fullDir, $mode = 0777 ) {
1549         if ( strval( $fullDir ) === '' ) {
1550                 return true;
1551         }
1552
1553         # Go back through the paths to find the first directory that exists
1554         $currentDir = $fullDir;
1555         $createList = array();
1556         while ( strval( $currentDir ) !== '' && !file_exists( $currentDir ) ) {
1557                 # Strip trailing slashes
1558                 $currentDir = rtrim( $currentDir, '/\\' );
1559
1560                 # Add to create list
1561                 $createList[] = $currentDir;
1562
1563                 # Find next delimiter searching from the end
1564                 $p = max( strrpos( $currentDir, '/' ), strrpos( $currentDir, '\\' ) );
1565                 if ( $p === false ) {
1566                         $currentDir = false;
1567                 } else {
1568                         $currentDir = substr( $currentDir, 0, $p );
1569                 }
1570         }
1571
1572         if ( count( $createList ) == 0 ) {
1573                 # Directory specified already exists
1574                 return true;
1575         } elseif ( $currentDir === false ) {
1576                 # Went all the way back to root and it apparently doesn't exist
1577                 return false;
1578         }
1579
1580         # Now go forward creating directories
1581         $createList = array_reverse( $createList );
1582         foreach ( $createList as $dir ) {
1583                 # use chmod to override the umask, as suggested by the PHP manual
1584                 if ( !mkdir( $dir, $mode ) || !chmod( $dir, $mode ) ) {
1585                         return false;
1586                 }
1587         }
1588         return true;
1589 }
1590
1591 /**
1592  * Increment a statistics counter
1593  */
1594  function wfIncrStats( $key ) {
1595          global $wgDBname, $wgMemc;
1596          $key = "$wgDBname:stats:$key";
1597          if ( is_null( $wgMemc->incr( $key ) ) ) {
1598                  $wgMemc->add( $key, 1 );
1599          }
1600  }
1601
1602 /**
1603  * @param mixed $nr The number to format
1604  * @param int $acc The number of digits after the decimal point, default 2
1605  * @param bool $round Whether or not to round the value, default true
1606  * @return float
1607  */
1608 function wfPercent( $nr, $acc = 2, $round = true ) {
1609         $ret = sprintf( "%.${acc}f", $nr );
1610         return $round ? round( $ret, $acc ) . '%' : "$ret%";
1611 }
1612
1613 /**
1614  * Encrypt a username/password.
1615  *
1616  * @param string $userid ID of the user
1617  * @param string $password Password of the user
1618  * @return string Hashed password
1619  */
1620 function wfEncryptPassword( $userid, $password ) {
1621         global $wgPasswordSalt;
1622         $p = md5( $password);
1623
1624         if($wgPasswordSalt)
1625                 return md5( "{$userid}-{$p}" );
1626         else
1627                 return $p;
1628 }
1629
1630 /**
1631  * Appends to second array if $value differs from that in $default
1632  */
1633 function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
1634         if ( is_null( $changed ) ) {
1635                 throw new MWException('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
1636         }
1637         if ( $default[$key] !== $value ) {
1638                 $changed[$key] = $value;
1639         }
1640 }
1641
1642 /**
1643  * Since wfMsg() and co suck, they don't return false if the message key they
1644  * looked up didn't exist but a XHTML string, this function checks for the
1645  * nonexistance of messages by looking at wfMsg() output
1646  *
1647  * @param $msg      The message key looked up
1648  * @param $wfMsgOut The output of wfMsg*()
1649  * @return bool
1650  */
1651 function wfEmptyMsg( $msg, $wfMsgOut ) {
1652         return $wfMsgOut === "&lt;$msg&gt;";
1653 }
1654
1655 /**
1656  * Find out whether or not a mixed variable exists in a string
1657  *
1658  * @param mixed  needle
1659  * @param string haystack
1660  * @return bool
1661  */
1662 function in_string( $needle, $str ) {
1663         return strpos( $str, $needle ) !== false;
1664 }
1665
1666 function wfSpecialList( $page, $details ) {
1667         global $wgContLang;
1668         $details = $details ? ' ' . $wgContLang->getDirMark() . "($details)" : "";
1669         return $page . $details;
1670 }
1671
1672 /**
1673  * Returns a regular expression of url protocols
1674  *
1675  * @return string
1676  */
1677 function wfUrlProtocols() {
1678         global $wgUrlProtocols;
1679
1680         // Support old-style $wgUrlProtocols strings, for backwards compatibility
1681         // with LocalSettings files from 1.5
1682         if ( is_array( $wgUrlProtocols ) ) {
1683                 $protocols = array();
1684                 foreach ($wgUrlProtocols as $protocol)
1685                         $protocols[] = preg_quote( $protocol, '/' );
1686
1687                 return implode( '|', $protocols );
1688         } else {
1689                 return $wgUrlProtocols;
1690         }
1691 }
1692
1693 /**
1694  * Execute a shell command, with time and memory limits mirrored from the PHP
1695  * configuration if supported.
1696  * @param $cmd Command line, properly escaped for shell.
1697  * @param &$retval optional, will receive the program's exit code.
1698  *                 (non-zero is usually failure)
1699  * @return collected stdout as a string (trailing newlines stripped)
1700  */
1701 function wfShellExec( $cmd, &$retval=null ) {
1702         global $IP, $wgMaxShellMemory;
1703
1704         if( ini_get( 'safe_mode' ) ) {
1705                 wfDebug( "wfShellExec can't run in safe_mode, PHP's exec functions are too broken.\n" );
1706                 $retval = 1;
1707                 return "Unable to run external programs in safe mode.";
1708         }
1709
1710         if ( php_uname( 's' ) == 'Linux' ) {
1711                 $time = ini_get( 'max_execution_time' );
1712                 $mem = intval( $wgMaxShellMemory );
1713
1714                 if ( $time > 0 && $mem > 0 ) {
1715                         $script = "$IP/bin/ulimit.sh";
1716                         if ( is_executable( $script ) ) {
1717                                 $cmd = escapeshellarg( $script ) . " $time $mem $cmd";
1718                         }
1719                 }
1720         } elseif ( php_uname( 's' ) == 'Windows NT' ) {
1721                 # This is a hack to work around PHP's flawed invocation of cmd.exe
1722                 # http://news.php.net/php.internals/21796
1723                 $cmd = '"' . $cmd . '"';
1724         }
1725         wfDebug( "wfShellExec: $cmd\n" );
1726
1727         $output = array();
1728         $retval = 1; // error by default?
1729         $lastline = exec( $cmd, $output, $retval );
1730         return implode( "\n", $output );
1731
1732 }
1733
1734 /**
1735  * This function works like "use VERSION" in Perl, the program will die with a
1736  * backtrace if the current version of PHP is less than the version provided
1737  *
1738  * This is useful for extensions which due to their nature are not kept in sync
1739  * with releases, and might depend on other versions of PHP than the main code
1740  *
1741  * Note: PHP might die due to parsing errors in some cases before it ever
1742  *       manages to call this function, such is life
1743  *
1744  * @see perldoc -f use
1745  *
1746  * @param mixed $version The version to check, can be a string, an integer, or
1747  *                       a float
1748  */
1749 function wfUsePHP( $req_ver ) {
1750         $php_ver = PHP_VERSION;
1751
1752         if ( version_compare( $php_ver, (string)$req_ver, '<' ) )
1753                  throw new MWException( "PHP $req_ver required--this is only $php_ver" );
1754 }
1755
1756 /**
1757  * This function works like "use VERSION" in Perl except it checks the version
1758  * of MediaWiki, the program will die with a backtrace if the current version
1759  * of MediaWiki is less than the version provided.
1760  *
1761  * This is useful for extensions which due to their nature are not kept in sync
1762  * with releases
1763  *
1764  * @see perldoc -f use
1765  *
1766  * @param mixed $version The version to check, can be a string, an integer, or
1767  *                       a float
1768  */
1769 function wfUseMW( $req_ver ) {
1770         global $wgVersion;
1771
1772         if ( version_compare( $wgVersion, (string)$req_ver, '<' ) )
1773                 throw new MWException( "MediaWiki $req_ver required--this is only $wgVersion" );
1774 }
1775
1776 /**
1777  * Escape a string to make it suitable for inclusion in a preg_replace()
1778  * replacement parameter.
1779  *
1780  * @param string $string
1781  * @return string
1782  */
1783 function wfRegexReplacement( $string ) {
1784         $string = str_replace( '\\', '\\\\', $string );
1785         $string = str_replace( '$', '\\$', $string );
1786         return $string;
1787 }
1788
1789 /**
1790  * Return the final portion of a pathname.
1791  * Reimplemented because PHP5's basename() is buggy with multibyte text.
1792  * http://bugs.php.net/bug.php?id=33898
1793  *
1794  * PHP's basename() only considers '\' a pathchar on Windows and Netware.
1795  * We'll consider it so always, as we don't want \s in our Unix paths either.
1796  *
1797  * @param string $path
1798  * @return string
1799  */
1800 function wfBaseName( $path ) {
1801         if( preg_match( '#([^/\\\\]*)[/\\\\]*$#', $path, $matches ) ) {
1802                 return $matches[1];
1803         } else {
1804                 return '';
1805         }
1806 }
1807
1808 /**
1809  * Make a URL index, appropriate for the el_index field of externallinks.
1810  */
1811 function wfMakeUrlIndex( $url ) {
1812         wfSuppressWarnings();
1813         $bits = parse_url( $url );
1814         wfRestoreWarnings();
1815         if ( !$bits || $bits['scheme'] !== 'http' ) {
1816                 return false;
1817         }
1818         // Reverse the labels in the hostname, convert to lower case
1819         $reversedHost = strtolower( implode( '.', array_reverse( explode( '.', $bits['host'] ) ) ) );
1820         // Add an extra dot to the end
1821         if ( substr( $reversedHost, -1, 1 ) !== '.' ) {
1822                 $reversedHost .= '.';
1823         }
1824         // Reconstruct the pseudo-URL
1825         $index = "http://$reversedHost";
1826         // Leave out user and password. Add the port, path, query and fragment
1827         if ( isset( $bits['port'] ) )      $index .= ':' . $bits['port'];
1828         if ( isset( $bits['path'] ) ) {
1829                 $index .= $bits['path'];
1830         } else {
1831                 $index .= '/';
1832         }
1833         if ( isset( $bits['query'] ) )     $index .= '?' . $bits['query'];
1834         if ( isset( $bits['fragment'] ) )  $index .= '#' . $bits['fragment'];
1835         return $index;
1836 }
1837
1838 /**
1839  * Do any deferred updates and clear the list
1840  * TODO: This could be in Wiki.php if that class made any sense at all
1841  */
1842 function wfDoUpdates()
1843 {
1844         global $wgPostCommitUpdateList, $wgDeferredUpdateList;
1845         foreach ( $wgDeferredUpdateList as $update ) {
1846                 $update->doUpdate();
1847         }
1848         foreach ( $wgPostCommitUpdateList as $update ) {
1849                 $update->doUpdate();
1850         }
1851         $wgDeferredUpdateList = array();
1852         $wgPostCommitUpdateList = array();
1853 }
1854
1855 /**
1856  * More or less "markup-safe" explode()
1857  * Ignores any instances of the separator inside <...>
1858  * @param string $separator
1859  * @param string $text
1860  * @return array
1861  */
1862 function wfExplodeMarkup( $separator, $text ) {
1863         $placeholder = "\x00";
1864
1865         // Just in case...
1866         $text = str_replace( $placeholder, '', $text );
1867
1868         // Trim stuff
1869         $replacer = new ReplacerCallback( $separator, $placeholder );
1870         $cleaned = preg_replace_callback( '/(<.*?>)/', array( $replacer, 'go' ), $text );
1871
1872         $items = explode( $separator, $cleaned );
1873         foreach( $items as $i => $str ) {
1874                 $items[$i] = str_replace( $placeholder, $separator, $str );
1875         }
1876
1877         return $items;
1878 }
1879
1880 class ReplacerCallback {
1881         function ReplacerCallback( $from, $to ) {
1882                 $this->from = $from;
1883                 $this->to = $to;
1884         }
1885
1886         function go( $matches ) {
1887                 return str_replace( $this->from, $this->to, $matches[1] );
1888         }
1889 }
1890
1891
1892 /**
1893  * Convert an arbitrarily-long digit string from one numeric base
1894  * to another, optionally zero-padding to a minimum column width.
1895  *
1896  * Supports base 2 through 36; digit values 10-36 are represented
1897  * as lowercase letters a-z. Input is case-insensitive.
1898  *
1899  * @param $input string of digits
1900  * @param $sourceBase int 2-36
1901  * @param $destBase int 2-36
1902  * @param $pad int 1 or greater
1903  * @return string or false on invalid input
1904  */
1905 function wfBaseConvert( $input, $sourceBase, $destBase, $pad=1 ) {
1906         if( $sourceBase < 2 ||
1907                 $sourceBase > 36 ||
1908                 $destBase < 2 ||
1909                 $destBase > 36 ||
1910                 $pad < 1 ||
1911                 $sourceBase != intval( $sourceBase ) ||
1912                 $destBase != intval( $destBase ) ||
1913                 $pad != intval( $pad ) ||
1914                 !is_string( $input ) ||
1915                 $input == '' ) {
1916                 return false;
1917         }
1918
1919         $digitChars = '0123456789abcdefghijklmnopqrstuvwxyz';
1920         $inDigits = array();
1921         $outChars = '';
1922
1923         // Decode and validate input string
1924         $input = strtolower( $input );
1925         for( $i = 0; $i < strlen( $input ); $i++ ) {
1926                 $n = strpos( $digitChars, $input{$i} );
1927                 if( $n === false || $n > $sourceBase ) {
1928                         return false;
1929                 }
1930                 $inDigits[] = $n;
1931         }
1932
1933         // Iterate over the input, modulo-ing out an output digit
1934         // at a time until input is gone.
1935         while( count( $inDigits ) ) {
1936                 $work = 0;
1937                 $workDigits = array();
1938
1939                 // Long division...
1940                 foreach( $inDigits as $digit ) {
1941                         $work *= $sourceBase;
1942                         $work += $digit;
1943
1944                         if( $work < $destBase ) {
1945                                 // Gonna need to pull another digit.
1946                                 if( count( $workDigits ) ) {
1947                                         // Avoid zero-padding; this lets us find
1948                                         // the end of the input very easily when
1949                                         // length drops to zero.
1950                                         $workDigits[] = 0;
1951                                 }
1952                         } else {
1953                                 // Finally! Actual division!
1954                                 $workDigits[] = intval( $work / $destBase );
1955
1956                                 // Isn't it annoying that most programming languages
1957                                 // don't have a single divide-and-remainder operator,
1958                                 // even though the CPU implements it that way?
1959                                 $work = $work % $destBase;
1960                         }
1961                 }
1962
1963                 // All that division leaves us with a remainder,
1964                 // which is conveniently our next output digit.
1965                 $outChars .= $digitChars[$work];
1966
1967                 // And we continue!
1968                 $inDigits = $workDigits;
1969         }
1970
1971         while( strlen( $outChars ) < $pad ) {
1972                 $outChars .= '0';
1973         }
1974
1975         return strrev( $outChars );
1976 }
1977
1978 /**
1979  * Create an object with a given name and an array of construct parameters
1980  * @param string $name
1981  * @param array $p parameters
1982  */
1983 function wfCreateObject( $name, $p ){
1984         $p = array_values( $p );
1985         switch ( count( $p ) ) {
1986                 case 0:
1987                         return new $name;
1988                 case 1:
1989                         return new $name( $p[0] );
1990                 case 2:
1991                         return new $name( $p[0], $p[1] );
1992                 case 3:
1993                         return new $name( $p[0], $p[1], $p[2] );
1994                 case 4:
1995                         return new $name( $p[0], $p[1], $p[2], $p[3] );
1996                 case 5:
1997                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4] );
1998                 case 6:
1999                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4], $p[5] );
2000                 default:
2001                         throw new MWException( "Too many arguments to construtor in wfCreateObject" );
2002         }
2003 }
2004
2005 /**
2006  * Aliases for modularized functions
2007  */
2008 function wfGetHTTP( $url, $timeout = 'default' ) {
2009         return Http::get( $url, $timeout );
2010 }
2011 function wfIsLocalURL( $url ) {
2012         return Http::isLocalURL( $url );
2013 }
2014
2015 /**
2016  * Initialise php session
2017  */
2018 function wfSetupSession() {
2019         global $wgSessionsInMemcached, $wgCookiePath, $wgCookieDomain;
2020         if( $wgSessionsInMemcached ) {
2021                 require_once( 'MemcachedSessions.php' );
2022         } elseif( 'files' != ini_get( 'session.save_handler' ) ) {
2023                 # If it's left on 'user' or another setting from another
2024                 # application, it will end up failing. Try to recover.
2025                 ini_set ( 'session.save_handler', 'files' );
2026         }
2027         session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain );
2028         session_cache_limiter( 'private, must-revalidate' );
2029         @session_start();
2030 }
2031
2032 /**
2033  * Get an object from the precompiled serialized directory
2034  *
2035  * @return mixed The variable on success, false on failure
2036  */
2037 function wfGetPrecompiledData( $name ) {
2038         global $IP;
2039
2040         $file = "$IP/serialized/$name";
2041         if ( file_exists( $file ) ) {
2042                 $blob = file_get_contents( $file );
2043                 if ( $blob ) {
2044                         return unserialize( $blob );
2045                 }
2046         }
2047         return false;
2048 }
2049
2050 function wfGetCaller( $level = 2 ) {
2051         $backtrace = debug_backtrace();
2052         if ( isset( $backtrace[$level] ) ) {
2053                 if ( isset( $backtrace[$level]['class'] ) ) {
2054                         $caller = $backtrace[$level]['class'] . '::' . $backtrace[$level]['function'];
2055                 } else {
2056                         $caller = $backtrace[$level]['function'];
2057                 }
2058         } else {
2059                 $caller = 'unknown';
2060         }
2061         return $caller;
2062 }
2063
2064 ?>