includes/GlobalFunctions.php

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