includes/GlobalFunctions.php

   1 <?php
   2
   3 /**
   4  * Global functions used everywhere
   5  * @package MediaWiki
   6  */
   7
   8 /**
   9  * Some globals and requires needed
  10  */
  11
  12 /**
  13  * Total number of articles
  14  * @global integer $wgNumberOfArticles
  15  */
  16 $wgNumberOfArticles = -1; # Unset
  17 /**
  18  * Total number of views
  19  * @global integer $wgTotalViews
  20  */
  21 $wgTotalViews = -1;
  22 /**
  23  * Total number of edits
  24  * @global integer $wgTotalEdits
  25  */
  26 $wgTotalEdits = -1;
  27
  28
  29 require_once( 'DatabaseFunctions.php' );
  30 require_once( 'UpdateClasses.php' );
  31 require_once( 'LogPage.php' );
  32 require_once( 'normal/UtfNormalUtil.php' );
  33
  34 /**
  35  * Compatibility functions
  36  * PHP <4.3.x is not actively supported; 4.1.x and 4.2.x might or might not work.
  37  * <4.1.x will not work, as we use a number of features introduced in 4.1.0
  38  * such as the new autoglobals.
  39  */
  40 if( !function_exists('iconv') ) {
  41         # iconv support is not in the default configuration and so may not be present.
  42         # Assume will only ever use utf-8 and iso-8859-1.
  43         # This will *not* work in all circumstances.
  44         function iconv( $from, $to, $string ) {
  45                 if(strcasecmp( $from, $to ) == 0) return $string;
  46                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  47                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  48                 return $string;
  49         }
  50 }
  51
  52 if( !function_exists('file_get_contents') ) {
  53         # Exists in PHP 4.3.0+
  54         function file_get_contents( $filename ) {
  55                 return implode( '', file( $filename ) );
  56         }
  57 }
  58
  59 if( !function_exists('is_a') ) {
  60         # Exists in PHP 4.2.0+
  61         function is_a( $object, $class_name ) {
  62                 return
  63                         (strcasecmp( get_class( $object ), $class_name ) == 0) ||
  64                          is_subclass_of( $object, $class_name );
  65         }
  66 }
  67
  68 # UTF-8 substr function based on a PHP manual comment
  69 if ( !function_exists( 'mb_substr' ) ) {
  70         function mb_substr( $str, $start ) {
  71                 preg_match_all( '/./us', $str, $ar );
  72
  73                 if( func_num_args() >= 3 ) {
  74                         $end = func_get_arg( 2 );
  75                         return join( '', array_slice( $ar[0], $start, $end ) );
  76                 } else {
  77                         return join( '', array_slice( $ar[0], $start ) );
  78                 }
  79         }
  80 }
  81
  82 /**
  83  * Where as we got a random seed
  84  * @var bool $wgTotalViews
  85  */
  86 $wgRandomSeeded = false;
  87
  88 /**
  89  * Seed Mersenne Twister
  90  * Only necessary in PHP < 4.2.0
  91  *
  92  * @return bool
  93  */
  94 function wfSeedRandom() {
  95         global $wgRandomSeeded;
  96
  97         if ( ! $wgRandomSeeded && version_compare( phpversion(), '4.2.0' ) < 0 ) {
  98                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
  99                 mt_srand( $seed );
 100                 $wgRandomSeeded = true;
 101         }
 102 }
 103
 104 /**
 105  * Get a random decimal value between 0 and 1, in a way
 106  * not likely to give duplicate values for any realistic
 107  * number of articles.
 108  *
 109  * @return string
 110  */
 111 function wfRandom() {
 112         # The maximum random value is "only" 2^31-1, so get two random
 113         # values to reduce the chance of dupes
 114         $max = mt_getrandmax();
 115         $rand = number_format( (mt_rand() * $max + mt_rand())
 116                 / $max / $max, 12, '.', '' );
 117         return $rand;
 118 }
 119
 120 /**
 121  * We want / and : to be included as literal characters in our title URLs.
 122  * %2F in the page titles seems to fatally break for some reason.
 123  *
 124  * @param string $s
 125  * @return string
 126 */
 127 function wfUrlencode ( $s ) {
 128         $s = urlencode( $s );
 129         $s = preg_replace( '/%3[Aa]/', ':', $s );
 130         $s = preg_replace( '/%2[Ff]/', '/', $s );
 131
 132         return $s;
 133 }
 134
 135 /**
 136  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 137  * In normal operation this is a NOP.
 138  *
 139  * Controlling globals:
 140  * $wgDebugLogFile - points to the log file
 141  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 142  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 143  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 144  *
 145  * @param string $text
 146  * @param bool $logonly Set true to avoid appearing in HTML when $wgDebugComments is set
 147  */
 148 function wfDebug( $text, $logonly = false ) {
 149         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 150
 151         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 152         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 153                 return;
 154         }
 155
 156         if ( isset( $wgOut ) && $wgDebugComments && !$logonly ) {
 157                 $wgOut->debug( $text );
 158         }
 159         if ( '' != $wgDebugLogFile && !$wgProfileOnly ) {
 160                 # Strip unprintables; they can switch terminal modes when binary data
 161                 # gets dumped, which is pretty annoying.
 162                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 163                 @error_log( $text, 3, $wgDebugLogFile );
 164         }
 165 }
 166
 167 /**
 168  * Log for database errors
 169  * @param string $text Database error message.
 170  */
 171 function wfLogDBError( $text ) {
 172         global $wgDBerrorLog;
 173         if ( $wgDBerrorLog ) {
 174                 $text = date('D M j G:i:s T Y') . "\t".$text;
 175                 error_log( $text, 3, $wgDBerrorLog );
 176         }
 177 }
 178
 179 /**
 180  * @todo document
 181  */
 182 function logProfilingData() {
 183         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 184         global $wgProfiling, $wgProfileStack, $wgProfileLimit, $wgUser;
 185         $now = wfTime();
 186
 187         list( $usec, $sec ) = explode( ' ', $wgRequestTime );
 188         $start = (float)$sec + (float)$usec;
 189         $elapsed = $now - $start;
 190         if ( $wgProfiling ) {
 191                 $prof = wfGetProfilingOutput( $start, $elapsed );
 192                 $forward = '';
 193                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 194                         $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 195                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 196                         $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 197                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 198                         $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 199                 if( $forward )
 200                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 201                 if( $wgUser->isAnon() )
 202                         $forward .= ' anon';
 203                 $log = sprintf( "%s\t%04.3f\t%s\n",
 204                   gmdate( 'YmdHis' ), $elapsed,
 205                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 206                 if ( '' != $wgDebugLogFile && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 207                         error_log( $log . $prof, 3, $wgDebugLogFile );
 208                 }
 209         }
 210 }
 211
 212 /**
 213  * Check if the wiki read-only lock file is present. This can be used to lock
 214  * off editing functions, but doesn't guarantee that the database will not be
 215  * modified.
 216  * @return bool
 217  */
 218 function wfReadOnly() {
 219         global $wgReadOnlyFile, $wgReadOnly;
 220
 221         if ( $wgReadOnly ) {
 222                 return true;
 223         }
 224         if ( '' == $wgReadOnlyFile ) {
 225                 return false;
 226         }
 227
 228         // Set $wgReadOnly and unset $wgReadOnlyFile, for faster access next time
 229         if ( is_file( $wgReadOnlyFile ) ) {
 230                 $wgReadOnly = true;
 231         } else {
 232                 $wgReadOnly = false;
 233         }
 234         $wgReadOnlyFile = '';
 235         return $wgReadOnly;
 236 }
 237
 238
 239 /**
 240  * Get a message from anywhere, for the current user language
 241  *
 242  * @param string
 243  */
 244 function wfMsg( $key ) {
 245         $args = func_get_args();
 246         array_shift( $args );
 247         return wfMsgReal( $key, $args, true );
 248 }
 249
 250 /**
 251  * Get a message from anywhere, for the current global language
 252  */
 253 function wfMsgForContent( $key ) {
 254         global $wgForceUIMsgAsContentMsg;
 255         $args = func_get_args();
 256         array_shift( $args );
 257         $forcontent = true;
 258         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 259                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 260                 $forcontent = false;
 261         return wfMsgReal( $key, $args, true, $forcontent );
 262 }
 263
 264 /**
 265  * Get a message from the language file, for the UI elements
 266  */
 267 function wfMsgNoDB( $key ) {
 268         $args = func_get_args();
 269         array_shift( $args );
 270         return wfMsgReal( $key, $args, false );
 271 }
 272
 273 /**
 274  * Get a message from the language file, for the content
 275  */
 276 function wfMsgNoDBForContent( $key ) {
 277         global $wgForceUIMsgAsContentMsg;
 278         $args = func_get_args();
 279         array_shift( $args );
 280         $forcontent = true;
 281         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 282                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 283                 $forcontent = false;
 284         return wfMsgReal( $key, $args, false, $forcontent );
 285 }
 286
 287
 288 /**
 289  * Really get a message
 290  */
 291 function wfMsgReal( $key, $args, $useDB, $forContent=false ) {
 292         $fname = 'wfMsgReal';
 293         wfProfileIn( $fname );
 294
 295         $message = wfMsgGetKey( $key, $useDB, $forContent );
 296         $message = wfMsgReplaceArgs( $message, $args );
 297         wfProfileOut( $fname );
 298         return $message;
 299 }
 300
 301 /**
 302  * Fetch a message string value, but don't replace any keys yet.
 303  * @param string $key
 304  * @param bool $useDB
 305  * @param bool $forContent
 306  * @return string
 307  * @access private
 308  */
 309 function wfMsgGetKey( $key, $useDB, $forContent = false ) {
 310         global $wgParser, $wgMsgParserOptions;
 311         global $wgContLang, $wgLanguageCode;
 312         global $wgMessageCache, $wgLang;
 313
 314         if( is_object( $wgMessageCache ) ) {
 315                 $message = $wgMessageCache->get( $key, $useDB, $forContent );
 316         } else {
 317                 if( $forContent ) {
 318                         $lang = &$wgContLang;
 319                 } else {
 320                         $lang = &$wgLang;
 321                 }
 322
 323                 wfSuppressWarnings();
 324
 325                 if( is_object( $lang ) ) {
 326                         $message = $lang->getMessage( $key );
 327                 } else {
 328                         $message = '';
 329                 }
 330                 wfRestoreWarnings();
 331                 if(!$message)
 332                         $message = Language::getMessage($key);
 333                 if(strstr($message, '{{' ) !== false) {
 334                         $message = $wgParser->transformMsg($message, $wgMsgParserOptions);
 335                 }
 336         }
 337         return $message;
 338 }
 339
 340 /**
 341  * Replace message parameter keys on the given formatted output.
 342  *
 343  * @param string $message
 344  * @param array $args
 345  * @return string
 346  * @access private
 347  */
 348 function wfMsgReplaceArgs( $message, $args ) {
 349         static $replacementKeys = array( '$1', '$2', '$3', '$4', '$5', '$6', '$7', '$8', '$9' );
 350
 351         # Fix windows line-endings
 352         # Some messages are split with explode("\n", $msg)
 353         $message = str_replace( "\r", '', $message );
 354
 355         # Replace arguments
 356         if( count( $args ) ) {
 357                 $message = str_replace( $replacementKeys, $args, $message );
 358         }
 359         return $message;
 360 }
 361
 362 /**
 363  * Return an HTML-escaped version of a message.
 364  * Parameter replacements, if any, are done *after* the HTML-escaping,
 365  * so parameters may contain HTML (eg links or form controls). Be sure
 366  * to pre-escape them if you really do want plaintext, or just wrap
 367  * the whole thing in htmlspecialchars().
 368  *
 369  * @param string $key
 370  * @param string ... parameters
 371  * @return string
 372  */
 373 function wfMsgHtml( $key ) {
 374         $args = func_get_args();
 375         array_shift( $args );
 376         return wfMsgReplaceArgs(
 377                 htmlspecialchars( wfMsgGetKey( $key, $args, true ) ),
 378                 $args );
 379 }
 380
 381 /**
 382  * Just like exit() but makes a note of it.
 383  * Commits open transactions except if the error parameter is set
 384  */
 385 function wfAbruptExit( $error = false ){
 386         global $wgLoadBalancer;
 387         static $called = false;
 388         if ( $called ){
 389                 exit();
 390         }
 391         $called = true;
 392
 393         if( function_exists( 'debug_backtrace' ) ){ // PHP >= 4.3
 394                 $bt = debug_backtrace();
 395                 for($i = 0; $i < count($bt) ; $i++){
 396                         $file = $bt[$i]['file'];
 397                         $line = $bt[$i]['line'];
 398                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 399                 }
 400         } else {
 401                 wfDebug('WARNING: Abrupt exit\n');
 402         }
 403         if ( !$error ) {
 404                 $wgLoadBalancer->closeAll();
 405         }
 406         exit();
 407 }
 408
 409 /**
 410  * @todo document
 411  */
 412 function wfErrorExit() {
 413         wfAbruptExit( true );
 414 }
 415
 416 /**
 417  * Die with a backtrace
 418  * This is meant as a debugging aid to track down where bad data comes from.
 419  * Shouldn't be used in production code except maybe in "shouldn't happen" areas.
 420  *
 421  * @param string $msg Message shown when dieing.
 422  */
 423 function wfDebugDieBacktrace( $msg = '' ) {
 424         global $wgCommandLineMode;
 425
 426         $backtrace = wfBacktrace();
 427         if ( $backtrace !== false ) {
 428                 if ( $wgCommandLineMode ) {
 429                         $msg .= "\nBacktrace:\n$backtrace";
 430                 } else {
 431                         $msg .= "\n<p>Backtrace:</p>\n$backtrace";
 432                 }
 433          }
 434          echo $msg;
 435          die( -1 );
 436 }
 437
 438 function wfBacktrace() {
 439         global $wgCommandLineMode;
 440         if ( !function_exists( 'debug_backtrace' ) ) {
 441                 return false;
 442         }
 443
 444         if ( $wgCommandLineMode ) {
 445                 $msg = '';
 446         } else {
 447                 $msg = "<ul>\n";
 448         }
 449         $backtrace = debug_backtrace();
 450         foreach( $backtrace as $call ) {
 451                 if( isset( $call['file'] ) ) {
 452                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 453                         $file = $f[count($f)-1];
 454                 } else {
 455                         $file = '-';
 456                 }
 457                 if( isset( $call['line'] ) ) {
 458                         $line = $call['line'];
 459                 } else {
 460                         $line = '-';
 461                 }
 462                 if ( $wgCommandLineMode ) {
 463                         $msg .= "$file line $line calls ";
 464                 } else {
 465                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
 466                 }
 467                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 468                 $msg .= $call['function'] . '()';
 469
 470                 if ( $wgCommandLineMode ) {
 471                         $msg .= "\n";
 472                 } else {
 473                         $msg .= "</li>\n";
 474                 }
 475         }
 476         if ( $wgCommandLineMode ) {
 477                 $msg .= "\n";
 478         } else {
 479                 $msg .= "</ul>\n";
 480         }
 481
 482         return $msg;
 483 }
 484
 485
 486 /* Some generic result counters, pulled out of SearchEngine */
 487
 488
 489 /**
 490  * @todo document
 491  */
 492 function wfShowingResults( $offset, $limit ) {
 493         global $wgLang;
 494         return wfMsg( 'showingresults', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 495 }
 496
 497 /**
 498  * @todo document
 499  */
 500 function wfShowingResultsNum( $offset, $limit, $num ) {
 501         global $wgLang;
 502         return wfMsg( 'showingresultsnum', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 503 }
 504
 505 /**
 506  * @todo document
 507  */
 508 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
 509         global $wgUser, $wgLang;
 510         $fmtLimit = $wgLang->formatNum( $limit );
 511         $prev = wfMsg( 'prevn', $fmtLimit );
 512         $next = wfMsg( 'nextn', $fmtLimit );
 513
 514         if( is_object( $link ) ) {
 515                 $title =& $link;
 516         } else {
 517                 $title =& Title::newFromText( $link );
 518                 if( is_null( $title ) ) {
 519                         return false;
 520                 }
 521         }
 522
 523         $sk = $wgUser->getSkin();
 524         if ( 0 != $offset ) {
 525                 $po = $offset - $limit;
 526                 if ( $po < 0 ) { $po = 0; }
 527                 $q = "limit={$limit}&offset={$po}";
 528                 if ( '' != $query ) { $q .= '&'.$query; }
 529                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$prev}</a>";
 530         } else { $plink = $prev; }
 531
 532         $no = $offset + $limit;
 533         $q = 'limit='.$limit.'&offset='.$no;
 534         if ( '' != $query ) { $q .= '&'.$query; }
 535
 536         if ( $atend ) {
 537                 $nlink = $next;
 538         } else {
 539                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$next}</a>";
 540         }
 541         $nums = wfNumLink( $offset, 20, $title, $query ) . ' | ' .
 542           wfNumLink( $offset, 50, $title, $query ) . ' | ' .
 543           wfNumLink( $offset, 100, $title, $query ) . ' | ' .
 544           wfNumLink( $offset, 250, $title, $query ) . ' | ' .
 545           wfNumLink( $offset, 500, $title, $query );
 546
 547         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 548 }
 549
 550 /**
 551  * @todo document
 552  */
 553 function wfNumLink( $offset, $limit, &$title, $query = '' ) {
 554         global $wgUser, $wgLang;
 555         if ( '' == $query ) { $q = ''; }
 556         else { $q = $query.'&'; }
 557         $q .= 'limit='.$limit.'&offset='.$offset;
 558
 559         $fmtLimit = $wgLang->formatNum( $limit );
 560         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$fmtLimit}</a>";
 561         return $s;
 562 }
 563
 564 /**
 565  * @todo document
 566  * @todo FIXME: we may want to blacklist some broken browsers
 567  *
 568  * @return bool Whereas client accept gzip compression
 569  */
 570 function wfClientAcceptsGzip() {
 571         global $wgUseGzip;
 572         if( $wgUseGzip ) {
 573                 # FIXME: we may want to blacklist some broken browsers
 574                 if( preg_match(
 575                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 576                         $_SERVER['HTTP_ACCEPT_ENCODING'],
 577                         $m ) ) {
 578                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
 579                         wfDebug( " accepts gzip\n" );
 580                         return true;
 581                 }
 582         }
 583         return false;
 584 }
 585
 586 /**
 587  * Yay, more global functions!
 588  */
 589 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
 590         global $wgRequest;
 591         return $wgRequest->getLimitOffset( $deflimit, $optionname );
 592 }
 593
 594 /**
 595  * Escapes the given text so that it may be output using addWikiText()
 596  * without any linking, formatting, etc. making its way through. This
 597  * is achieved by substituting certain characters with HTML entities.
 598  * As required by the callers, <nowiki> is not used. It currently does
 599  * not filter out characters which have special meaning only at the
 600  * start of a line, such as "*".
 601  *
 602  * @param string $text Text to be escaped
 603  */
 604 function wfEscapeWikiText( $text ) {
 605         $text = str_replace(
 606                 array( '[',             '|',      '\'',    'ISBN '        , '://'         , "\n=", '{{' ),
 607                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', '&#58;//' , "\n&#61;", '&#123;&#123;' ),
 608                 htmlspecialchars($text) );
 609         return $text;
 610 }
 611
 612 /**
 613  * @todo document
 614  */
 615 function wfQuotedPrintable( $string, $charset = '' ) {
 616         # Probably incomplete; see RFC 2045
 617         if( empty( $charset ) ) {
 618                 global $wgInputEncoding;
 619                 $charset = $wgInputEncoding;
 620         }
 621         $charset = strtoupper( $charset );
 622         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
 623
 624         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 625         $replace = $illegal . '\t ?_';
 626         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 627         $out = "=?$charset?Q?";
 628         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 629         $out .= '?=';
 630         return $out;
 631 }
 632
 633 /**
 634  * Returns an escaped string suitable for inclusion in a string literal
 635  * for JavaScript source code.
 636  * Illegal control characters are assumed not to be present.
 637  *
 638  * @param string $string
 639  * @return string
 640  */
 641 function wfEscapeJsString( $string ) {
 642         // See ECMA 262 section 7.8.4 for string literal format
 643         $pairs = array(
 644                 "\\" => "\\\\",
 645                 "\"" => "\\\"",
 646                 "\'" => "\\\'",
 647                 "\n" => "\\n",
 648                 "\r" => "\\r",
 649
 650                 # To avoid closing the element or CDATA section
 651                 "<" => "\\x3c",
 652                 ">" => "\\x3e",
 653         );
 654         return strtr( $string, $pairs );
 655 }
 656
 657 /**
 658  * @todo document
 659  * @return float
 660  */
 661 function wfTime() {
 662         $st = explode( ' ', microtime() );
 663         return (float)$st[0] + (float)$st[1];
 664 }
 665
 666 /**
 667  * Changes the first character to an HTML entity
 668  */
 669 function wfHtmlEscapeFirst( $text ) {
 670         $ord = ord($text);
 671         $newText = substr($text, 1);
 672         return "&#$ord;$newText";
 673 }
 674
 675 /**
 676  * Sets dest to source and returns the original value of dest
 677  * If source is NULL, it just returns the value, it doesn't set the variable
 678  */
 679 function wfSetVar( &$dest, $source ) {
 680         $temp = $dest;
 681         if ( !is_null( $source ) ) {
 682                 $dest = $source;
 683         }
 684         return $temp;
 685 }
 686
 687 /**
 688  * As for wfSetVar except setting a bit
 689  */
 690 function wfSetBit( &$dest, $bit, $state = true ) {
 691         $temp = (bool)($dest & $bit );
 692         if ( !is_null( $state ) ) {
 693                 if ( $state ) {
 694                         $dest |= $bit;
 695                 } else {
 696                         $dest &= ~$bit;
 697                 }
 698         }
 699         return $temp;
 700 }
 701
 702 /**
 703  * This function takes two arrays as input, and returns a CGI-style string, e.g.
 704  * "days=7&limit=100". Options in the first array override options in the second.
 705  * Options set to "" will not be output.
 706  */
 707 function wfArrayToCGI( $array1, $array2 = NULL )
 708 {
 709         if ( !is_null( $array2 ) ) {
 710                 $array1 = $array1 + $array2;
 711         }
 712
 713         $cgi = '';
 714         foreach ( $array1 as $key => $value ) {
 715                 if ( '' !== $value ) {
 716                         if ( '' != $cgi ) {
 717                                 $cgi .= '&';
 718                         }
 719                         $cgi .= urlencode( $key ) . '=' . urlencode( $value );
 720                 }
 721         }
 722         return $cgi;
 723 }
 724
 725 /**
 726  * This is obsolete, use SquidUpdate::purge()
 727  * @deprecated
 728  */
 729 function wfPurgeSquidServers ($urlArr) {
 730         SquidUpdate::purge( $urlArr );
 731 }
 732
 733 /**
 734  * Windows-compatible version of escapeshellarg()
 735  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
 736  * function puts single quotes in regardless of OS
 737  */
 738 function wfEscapeShellArg( ) {
 739         $args = func_get_args();
 740         $first = true;
 741         $retVal = '';
 742         foreach ( $args as $arg ) {
 743                 if ( !$first ) {
 744                         $retVal .= ' ';
 745                 } else {
 746                         $first = false;
 747                 }
 748
 749                 if ( wfIsWindows() ) {
 750                         $retVal .= '"' . str_replace( '"','\"', $arg ) . '"';
 751                 } else {
 752                         $retVal .= escapeshellarg( $arg );
 753                 }
 754         }
 755         return $retVal;
 756 }
 757
 758 /**
 759  * wfMerge attempts to merge differences between three texts.
 760  * Returns true for a clean merge and false for failure or a conflict.
 761  */
 762 function wfMerge( $old, $mine, $yours, &$result ){
 763         global $wgDiff3;
 764
 765         # This check may also protect against code injection in
 766         # case of broken installations.
 767         if(! file_exists( $wgDiff3 ) ){
 768                 return false;
 769         }
 770
 771         # Make temporary files
 772         $td = wfTempDir();
 773         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
 774         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
 775         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
 776
 777         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
 778         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
 779         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
 780
 781         # Check for a conflict
 782         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a --overlap-only ' .
 783           wfEscapeShellArg( $mytextName ) . ' ' .
 784           wfEscapeShellArg( $oldtextName ) . ' ' .
 785           wfEscapeShellArg( $yourtextName );
 786         $handle = popen( $cmd, 'r' );
 787
 788         if( fgets( $handle, 1024 ) ){
 789                 $conflict = true;
 790         } else {
 791                 $conflict = false;
 792         }
 793         pclose( $handle );
 794
 795         # Merge differences
 796         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a -e --merge ' .
 797           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
 798         $handle = popen( $cmd, 'r' );
 799         $result = '';
 800         do {
 801                 $data = fread( $handle, 8192 );
 802                 if ( strlen( $data ) == 0 ) {
 803                         break;
 804                 }
 805                 $result .= $data;
 806         } while ( true );
 807         pclose( $handle );
 808         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
 809         return ! $conflict;
 810 }
 811
 812 /**
 813  * @todo document
 814  */
 815 function wfVarDump( $var ) {
 816         global $wgOut;
 817         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
 818         if ( headers_sent() || !@is_object( $wgOut ) ) {
 819                 print $s;
 820         } else {
 821                 $wgOut->addHTML( $s );
 822         }
 823 }
 824
 825 /**
 826  * Provide a simple HTTP error.
 827  */
 828 function wfHttpError( $code, $label, $desc ) {
 829         global $wgOut;
 830         $wgOut->disable();
 831         header( "HTTP/1.0 $code $label" );
 832         header( "Status: $code $label" );
 833         $wgOut->sendCacheControl();
 834
 835         header( 'Content-type: text/html' );
 836         print "<html><head><title>" .
 837                 htmlspecialchars( $label ) .
 838                 "</title></head><body><h1>" .
 839                 htmlspecialchars( $label ) .
 840                 "</h1><p>" .
 841                 htmlspecialchars( $desc ) .
 842                 "</p></body></html>\n";
 843 }
 844
 845 /**
 846  * Converts an Accept-* header into an array mapping string values to quality
 847  * factors
 848  */
 849 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
 850         # No arg means accept anything (per HTTP spec)
 851         if( !$accept ) {
 852                 return array( $def => 1 );
 853         }
 854
 855         $prefs = array();
 856
 857         $parts = explode( ',', $accept );
 858
 859         foreach( $parts as $part ) {
 860                 # FIXME: doesn't deal with params like 'text/html; level=1'
 861                 @list( $value, $qpart ) = explode( ';', $part );
 862                 if( !isset( $qpart ) ) {
 863                         $prefs[$value] = 1;
 864                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
 865                         $prefs[$value] = $match[1];
 866                 }
 867         }
 868
 869         return $prefs;
 870 }
 871
 872 /**
 873  * Checks if a given MIME type matches any of the keys in the given
 874  * array. Basic wildcards are accepted in the array keys.
 875  *
 876  * Returns the matching MIME type (or wildcard) if a match, otherwise
 877  * NULL if no match.
 878  *
 879  * @param string $type
 880  * @param array $avail
 881  * @return string
 882  * @access private
 883  */
 884 function mimeTypeMatch( $type, $avail ) {
 885         if( array_key_exists($type, $avail) ) {
 886                 return $type;
 887         } else {
 888                 $parts = explode( '/', $type );
 889                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
 890                         return $parts[0] . '/*';
 891                 } elseif( array_key_exists( '*/*', $avail ) ) {
 892                         return '*/*';
 893                 } else {
 894                         return NULL;
 895                 }
 896         }
 897 }
 898
 899 /**
 900  * Returns the 'best' match between a client's requested internet media types
 901  * and the server's list of available types. Each list should be an associative
 902  * array of type to preference (preference is a float between 0.0 and 1.0).
 903  * Wildcards in the types are acceptable.
 904  *
 905  * @param array $cprefs Client's acceptable type list
 906  * @param array $sprefs Server's offered types
 907  * @return string
 908  *
 909  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
 910  * XXX: generalize to negotiate other stuff
 911  */
 912 function wfNegotiateType( $cprefs, $sprefs ) {
 913         $combine = array();
 914
 915         foreach( array_keys($sprefs) as $type ) {
 916                 $parts = explode( '/', $type );
 917                 if( $parts[1] != '*' ) {
 918                         $ckey = mimeTypeMatch( $type, $cprefs );
 919                         if( $ckey ) {
 920                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
 921                         }
 922                 }
 923         }
 924
 925         foreach( array_keys( $cprefs ) as $type ) {
 926                 $parts = explode( '/', $type );
 927                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
 928                         $skey = mimeTypeMatch( $type, $sprefs );
 929                         if( $skey ) {
 930                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
 931                         }
 932                 }
 933         }
 934
 935         $bestq = 0;
 936         $besttype = NULL;
 937
 938         foreach( array_keys( $combine ) as $type ) {
 939                 if( $combine[$type] > $bestq ) {
 940                         $besttype = $type;
 941                         $bestq = $combine[$type];
 942                 }
 943         }
 944
 945         return $besttype;
 946 }
 947
 948 /**
 949  * Array lookup
 950  * Returns an array where the values in the first array are replaced by the
 951  * values in the second array with the corresponding keys
 952  *
 953  * @return array
 954  */
 955 function wfArrayLookup( $a, $b ) {
 956         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
 957 }
 958
 959 /**
 960  * Convenience function; returns MediaWiki timestamp for the present time.
 961  * @return string
 962  */
 963 function wfTimestampNow() {
 964         # return NOW
 965         return wfTimestamp( TS_MW, time() );
 966 }
 967
 968 /**
 969  * Reference-counted warning suppression
 970  */
 971 function wfSuppressWarnings( $end = false ) {
 972         static $suppressCount = 0;
 973         static $originalLevel = false;
 974
 975         if ( $end ) {
 976                 if ( $suppressCount ) {
 977                         $suppressCount --;
 978                         if ( !$suppressCount ) {
 979                                 error_reporting( $originalLevel );
 980                         }
 981                 }
 982         } else {
 983                 if ( !$suppressCount ) {
 984                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
 985                 }
 986                 $suppressCount++;
 987         }
 988 }
 989
 990 /**
 991  * Restore error level to previous value
 992  */
 993 function wfRestoreWarnings() {
 994         wfSuppressWarnings( true );
 995 }
 996
 997 # Autodetect, convert and provide timestamps of various types
 998
 999 /**
1000  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1001  */
1002 define('TS_UNIX', 0);
1003
1004 /**
1005  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1006  */
1007 define('TS_MW', 1);
1008
1009 /**
1010  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1011  */
1012 define('TS_DB', 2);
1013
1014 /**
1015  * RFC 2822 format, for E-mail and HTTP headers
1016  */
1017 define('TS_RFC2822', 3);
1018
1019 /**
1020  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1021  *
1022  * @link http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1023  *       DateTime tag and page 36 for the DateTimeOriginal and
1024  *       DateTimeDigitized tags.
1025  */
1026 define('TS_EXIF', 4);
1027
1028
1029 /**
1030  * @param mixed $outputtype A timestamp in one of the supported formats, the
1031  *                          function will autodetect which format is supplied
1032                             and act accordingly.
1033  * @return string Time in the format specified in $outputtype
1034  */
1035 function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
1036         if ($ts==0) {
1037                 $uts=time();
1038         } elseif (preg_match("/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
1039                 # TS_DB
1040                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1041                             (int)$da[2],(int)$da[3],(int)$da[1]);
1042         } elseif (preg_match("/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
1043                 # TS_EXIF
1044                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1045                         (int)$da[2],(int)$da[3],(int)$da[1]);
1046         } elseif (preg_match("/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/",$ts,$da)) {
1047                 # TS_MW
1048                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1049                             (int)$da[2],(int)$da[3],(int)$da[1]);
1050         } elseif (preg_match("/^(\d{1,13})$/",$ts,$datearray)) {
1051                 # TS_UNIX
1052                 $uts=$ts;
1053         } else {
1054                 # Bogus value; fall back to the epoch...
1055                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1056                 $uts = 0;
1057         }
1058
1059
1060         switch($outputtype) {
1061                 case TS_UNIX:
1062                         return $uts;
1063                 case TS_MW:
1064                         return gmdate( 'YmdHis', $uts );
1065                 case TS_DB:
1066                         return gmdate( 'Y-m-d H:i:s', $uts );
1067                 // This shouldn't ever be used, but is included for completeness
1068                 case TS_EXIF:
1069                         return gmdate(  'Y:m:d H:i:s', $uts );
1070                 case TS_RFC2822:
1071                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1072                 default:
1073                         wfDebugDieBacktrace( 'wfTimestamp() called with illegal output type.');
1074         }
1075 }
1076
1077 /**
1078  * Return a formatted timestamp, or null if input is null.
1079  * For dealing with nullable timestamp columns in the database.
1080  * @param int $outputtype
1081  * @param string $ts
1082  * @return string
1083  */
1084 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1085         if( is_null( $ts ) ) {
1086                 return null;
1087         } else {
1088                 return wfTimestamp( $outputtype, $ts );
1089         }
1090 }
1091
1092 /**
1093  * Check where as the operating system is Windows
1094  *
1095  * @return bool True if it's windows, False otherwise.
1096  */
1097 function wfIsWindows() {
1098         if (substr(php_uname(), 0, 7) == 'Windows') {
1099                 return true;
1100         } else {
1101                 return false;
1102         }
1103 }
1104
1105 /**
1106  * Swap two variables
1107  */
1108 function swap( &$x, &$y ) {
1109         $z = $x;
1110         $x = $y;
1111         $y = $z;
1112 }
1113
1114 function wfGetSiteNotice() {
1115         global $wgSiteNotice, $wgTitle, $wgOut;
1116         $fname = 'wfGetSiteNotice';
1117         wfProfileIn( $fname );
1118
1119         $notice = wfMsg( 'sitenotice' );
1120         if( $notice == '&lt;sitenotice&gt;' || $notice == '-' ) {
1121                 $notice = '';
1122         }
1123         if( $notice == '' ) {
1124                 # We may also need to override a message with eg downtime info
1125                 # FIXME: make this work!
1126                 $notice = $wgSiteNotice;
1127         }
1128         if($notice != '-' && $notice != '') {
1129                 $specialparser = new Parser();
1130                 $parserOutput = $specialparser->parse( $notice, $wgTitle, $wgOut->mParserOptions, false );
1131                 $notice = $parserOutput->getText();
1132         }
1133         wfProfileOut( $fname );
1134         return $notice;
1135 }
1136
1137 /**
1138  * Format an XML element with given attributes and, optionally, text content.
1139  * Element and attribute names are assumed to be ready for literal inclusion.
1140  * Strings are assumed to not contain XML-illegal characters; special
1141  * characters (<, >, &) are escaped but illegals are not touched.
1142  *
1143  * @param string $element
1144  * @param array $attribs Name=>value pairs. Values will be escaped.
1145  * @param bool $contents NULL to make an open tag only; '' for a contentless closed tag (default)
1146  * @return string
1147  */
1148 function wfElement( $element, $attribs = null, $contents = '') {
1149         $out = '<' . $element;
1150         if( !is_null( $attribs ) ) {
1151                 foreach( $attribs as $name => $val ) {
1152                         $out .= ' ' . $name . '="' . htmlspecialchars( $val ) . '"';
1153                 }
1154         }
1155         if( is_null( $contents ) ) {
1156                 $out .= '>';
1157         } else {
1158                 if( $contents == '' ) {
1159                         $out .= ' />';
1160                 } else {
1161                         $out .= '>';
1162                         $out .= htmlspecialchars( $contents );
1163                         $out .= "</$element>";
1164                 }
1165         }
1166         return $out;
1167 }
1168
1169 /**
1170  * Format an XML element as with wfElement(), but run text through the
1171  * UtfNormal::cleanUp() validator first to ensure that no invalid UTF-8
1172  * is passed.
1173  *
1174  * @param string $element
1175  * @param array $attribs Name=>value pairs. Values will be escaped.
1176  * @param bool $contents NULL to make an open tag only; '' for a contentless closed tag (default)
1177  * @return string
1178  */
1179 function wfElementClean( $element, $attribs = array(), $contents = '') {
1180         if( $attribs ) {
1181                 $attribs = array_map( array( 'UtfNormal', 'cleanUp' ), $attribs );
1182         }
1183         if( $contents ) {
1184                 $contents = UtfNormal::cleanUp( $contents );
1185         }
1186         return wfElement( $element, $attribs, $contents );
1187 }
1188
1189 /** Global singleton instance of MimeMagic. This is initialized on demand,
1190 * please always use the wfGetMimeMagic() function to get the instance.
1191 *
1192 * @private
1193 */
1194 $wgMimeMagic= NULL;
1195
1196 /** Factory functions for the global MimeMagic object.
1197 * This function always returns the same singleton instance of MimeMagic.
1198 * That objects will be instantiated on the first call to this function.
1199 * If needed, the MimeMagic.php file is automatically included by this function.
1200 * @return MimeMagic the global MimeMagic objects.
1201 */
1202 function &wfGetMimeMagic() {
1203         global $wgMimeMagic;
1204
1205         if (!is_null($wgMimeMagic)) {
1206                 return $wgMimeMagic;
1207         }
1208
1209         if (!class_exists("MimeMagic")) {
1210                 #include on demand
1211                 require_once("MimeMagic.php");
1212         }
1213
1214         $wgMimeMagic= new MimeMagic();
1215
1216         return $wgMimeMagic;
1217 }
1218
1219
1220 /**
1221  * Tries to get the system directory for temporary files.
1222  * The TMPDIR, TMP, and TEMP environment variables are checked in sequence,
1223  * and if none are set /tmp is returned as the generic Unix default.
1224  *
1225  * NOTE: When possible, use the tempfile() function to create temporary
1226  * files to avoid race conditions on file creation, etc.
1227  *
1228  * @return string
1229  */
1230 function wfTempDir() {
1231         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
1232                 $tmp = getenv( $var );
1233                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
1234                         return $tmp;
1235                 }
1236         }
1237         # Hope this is Unix of some kind!
1238         return '/tmp';
1239 }
1240
1241 /**
1242  * Make directory, and make all parent directories if they don't exist
1243  */
1244 function wfMkdirParents( $fullDir, $mode ) {
1245         $parts = explode( '/', $fullDir );
1246         $path = '';
1247         $success = false;
1248         foreach ( $parts as $dir ) {
1249                 $path .= $dir . '/';
1250                 if ( !is_dir( $path ) ) {
1251                         if ( !mkdir( $path, $mode ) ) {
1252                                 return false;
1253                         }
1254                 }
1255         }
1256         return true;
1257 }
1258
1259 /**
1260  * Increment a statistics counter
1261  */
1262 function wfIncrStats( $key ) {
1263         global $wgDBname, $wgMemc;
1264         $key = "$wgDBname:stats:$key";
1265         if ( is_null( $wgMemc->incr( $key ) ) ) {
1266                 $wgMemc->add( $key, 1 );
1267         }
1268 }
1269
1270 ?>