includes/GlobalFunctions.php

   1 <?php
   2 # Global functions used everywhere
   3 # $Id$
   4
   5 $wgNumberOfArticles = -1; # Unset
   6 $wgTotalViews = -1;
   7 $wgTotalEdits = -1;
   8
   9 require_once( 'DatabaseFunctions.php' );
  10 require_once( 'UpdateClasses.php' );
  11 require_once( 'LogPage.php' );
  12
  13 /*
  14  * Compatibility functions
  15  */
  16
  17 # PHP <4.3.x is not actively supported; 4.1.x and 4.2.x might or might not work.
  18 # <4.1.x will not work, as we use a number of features introduced in 4.1.0
  19 # such as the new autoglobals.
  20
  21 if( !function_exists('iconv') ) {
  22         # iconv support is not in the default configuration and so may not be present.
  23         # Assume will only ever use utf-8 and iso-8859-1.
  24         # This will *not* work in all circumstances.
  25         function iconv( $from, $to, $string ) {
  26                 if(strcasecmp( $from, $to ) == 0) return $string;
  27                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  28                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  29                 return $string;
  30         }
  31 }
  32
  33 if( !function_exists('file_get_contents') ) {
  34         # Exists in PHP 4.3.0+
  35         function file_get_contents( $filename ) {
  36                 return implode( '', file( $filename ) );
  37         }
  38 }
  39
  40 if( !function_exists('is_a') ) {
  41         # Exists in PHP 4.2.0+
  42         function is_a( $object, $class_name ) {
  43                 return
  44                         (strcasecmp( get_class( $object ), $class_name ) == 0) ||
  45                          is_subclass_of( $object, $class_name );
  46         }
  47 }
  48
  49 # UTF-8 substr function based on a PHP manual comment
  50 if ( !function_exists( 'mb_substr' ) ) {
  51         function mb_substr($str,$start)
  52         {
  53                 preg_match_all("/./us", $str, $ar);
  54
  55                 if(func_num_args() >= 3) {
  56                         $end = func_get_arg(2);
  57                         return join("",array_slice($ar[0],$start,$end));
  58                 } else {
  59                         return join("",array_slice($ar[0],$start));
  60                 }
  61         }
  62 }
  63
  64 # html_entity_decode exists in PHP 4.3.0+ but is FATALLY BROKEN even then,
  65 # with no UTF-8 support.
  66 function do_html_entity_decode( $string, $quote_style=ENT_COMPAT, $charset='ISO-8859-1' ) {
  67         static $trans;
  68         if( !isset( $trans ) ) {
  69                 $trans = array_flip( get_html_translation_table( HTML_ENTITIES, $quote_style ) );
  70                 # Assumes $charset will always be the same through a run, and only understands
  71                 # utf-8 or default. Note - mixing latin1 named entities and unicode numbered
  72                 # ones will result in a bad link.
  73                 if( strcasecmp( 'utf-8', $charset ) == 0 ) {
  74                         $trans = array_map( 'utf8_encode', $trans );
  75                 }
  76         }
  77         return strtr( $string, $trans );
  78 }
  79
  80 $wgRandomSeeded = false;
  81
  82 # Seed Mersenne Twister
  83 # Only necessary in PHP < 4.2.0
  84 function wfSeedRandom()
  85 {
  86         global $wgRandomSeeded;
  87
  88         if ( ! $wgRandomSeeded && version_compare( phpversion(), '4.2.0' ) < 0 ) {
  89                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
  90                 mt_srand( $seed );
  91                 $wgRandomSeeded = true;
  92         }
  93 }
  94
  95 # Generates a URL from a URL-encoded title and a query string
  96 # Title::getLocalURL() is preferred in most cases
  97 #
  98 function wfLocalUrl( $a, $q = '' )
  99 {
 100         global $wgServer, $wgScript, $wgArticlePath;
 101
 102         $a = str_replace( ' ', '_', $a );
 103
 104         if ( '' == $a ) {
 105                 if( '' == $q ) {
 106                         $a = $wgScript;
 107                 } else {
 108                         $a = $wgScript.'?'.$q;
 109                 }
 110         } else if ( '' == $q ) {
 111                 $a = str_replace( '$1', $a, $wgArticlePath );
 112         } else if ($wgScript != '' ) {
 113                 $a = "{$wgScript}?title={$a}&{$q}";
 114         } else { //XXX hackish solution for toplevel wikis
 115                 $a = "/{$a}?{$q}";
 116         }
 117         return $a;
 118 }
 119
 120 function wfLocalUrlE( $a, $q = '' )
 121 {
 122         return htmlspecialchars( wfLocalUrl( $a, $q ) );
 123         # die( "Call to obsolete function wfLocalUrlE()" );
 124 }
 125
 126 # We want / and : to be included as literal characters in our title URLs.
 127 # %2F in the page titles seems to fatally break for some reason.
 128 #
 129 function wfUrlencode ( $s )
 130 {
 131         $s = urlencode( $s );
 132         $s = preg_replace( '/%3[Aa]/', ':', $s );
 133         $s = preg_replace( '/%2[Ff]/', '/', $s );
 134
 135         return $s;
 136 }
 137
 138 # Return the UTF-8 sequence for a given Unicode code point.
 139 # Currently doesn't work for values outside the Basic Multilingual Plane.
 140 #
 141 function wfUtf8Sequence( $codepoint ) {
 142         if($codepoint <         0x80) return chr($codepoint);
 143         if($codepoint <    0x800) return chr($codepoint >>      6 & 0x3f | 0xc0) .
 144                                                                          chr($codepoint           & 0x3f | 0x80);
 145         if($codepoint <  0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
 146                                                                          chr($codepoint >>      6 & 0x3f | 0x80) .
 147                                                                          chr($codepoint           & 0x3f | 0x80);
 148         if($codepoint < 0x110000) return chr($codepoint >> 18 & 0x07 | 0xf0) .
 149                                                                          chr($codepoint >> 12 & 0x3f | 0x80) .
 150                                                                          chr($codepoint >>      6 & 0x3f | 0x80) .
 151                                                                          chr($codepoint           & 0x3f | 0x80);
 152
 153         # There should be no assigned code points outside this range, but...
 154         return "&#$codepoint;";
 155 }
 156
 157 # Converts numeric character entities to UTF-8
 158 function wfMungeToUtf8( $string ) {
 159         global $wgInputEncoding; # This is debatable
 160         #$string = iconv($wgInputEncoding, "UTF-8", $string);
 161         $string = preg_replace ( '/&#([0-9]+);/e', 'wfUtf8Sequence($1)', $string );
 162         $string = preg_replace ( '/&#x([0-9a-f]+);/ie', 'wfUtf8Sequence(0x$1)', $string );
 163         # Should also do named entities here
 164         return $string;
 165 }
 166
 167 # Converts a single UTF-8 character into the corresponding HTML character entity
 168 # (for use with preg_replace_callback)
 169 function wfUtf8Entity( $matches ) {
 170         $char = $matches[0];
 171         # Find the length
 172         $z = ord( $char{0} );
 173         if ( $z & 0x80 ) {
 174                 $length = 0;
 175                 while ( $z & 0x80 ) {
 176                         $length++;
 177                         $z <<= 1;
 178                 }
 179         } else {
 180                 $length = 1;
 181         }
 182
 183         if ( $length != strlen( $char ) ) {
 184                 return '';
 185         }
 186         if ( $length == 1 ) {
 187                 return $char;
 188         }
 189
 190         # Mask off the length-determining bits and shift back to the original location
 191         $z &= 0xff;
 192         $z >>= $length;
 193
 194         # Add in the free bits from subsequent bytes
 195         for ( $i=1; $i<$length; $i++ ) {
 196                 $z <<= 6;
 197                 $z |= ord( $char{$i} ) & 0x3f;
 198         }
 199
 200         # Make entity
 201         return "&#$z;";
 202 }
 203
 204 # Converts all multi-byte characters in a UTF-8 string into the appropriate character entity
 205 function wfUtf8ToHTML($string) {
 206         return preg_replace_callback( '/[\\xc0-\\xfd][\\x80-\\xbf]*/', 'wfUtf8Entity', $string );
 207 }
 208
 209 function wfDebug( $text, $logonly = false )
 210 {
 211         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 212
 213         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 214         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 215                 return;
 216         }
 217
 218         if ( isset( $wgOut ) && $wgDebugComments && !$logonly ) {
 219                 $wgOut->debug( $text );
 220         }
 221         if ( '' != $wgDebugLogFile && !$wgProfileOnly ) {
 222                 error_log( $text, 3, $wgDebugLogFile );
 223         }
 224 }
 225
 226 # Log for database errors
 227 function wfLogDBError( $text ) {
 228         global $wgDBerrorLog;
 229         if ( $wgDBerrorLog ) {
 230                 $text = date('D M j G:i:s T Y') . "\t".$text;
 231                 error_log( $text, 3, $wgDBerrorLog );
 232         }
 233 }
 234
 235 function logProfilingData()
 236 {
 237         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 238         global $wgProfiling, $wgProfileStack, $wgProfileLimit, $wgUser;
 239         $now = wfTime();
 240
 241         list( $usec, $sec ) = explode( ' ', $wgRequestTime );
 242         $start = (float)$sec + (float)$usec;
 243         $elapsed = $now - $start;
 244         if ( $wgProfiling ) {
 245                 $prof = wfGetProfilingOutput( $start, $elapsed );
 246                 $forward = '';
 247                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 248                         $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 249                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 250                         $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 251                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 252                         $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 253                 if( $forward )
 254                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 255                 if($wgUser->getId() == 0)
 256                         $forward .= ' anon';
 257                 $log = sprintf( "%s\t%04.3f\t%s\n",
 258                   gmdate( 'YmdHis' ), $elapsed,
 259                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 260                 if ( '' != $wgDebugLogFile && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 261                         error_log( $log . $prof, 3, $wgDebugLogFile );
 262                 }
 263         }
 264 }
 265
 266 # Check if the wiki read-only lock file is present. This can be used to lock off
 267 # editing functions, but doesn't guarantee that the database will not be modified.
 268 function wfReadOnly() {
 269         global $wgReadOnlyFile;
 270
 271         if ( '' == $wgReadOnlyFile ) {
 272                 return false;
 273         }
 274         return is_file( $wgReadOnlyFile );
 275 }
 276
 277 $wgReplacementKeys = array( '$1', '$2', '$3', '$4', '$5', '$6', '$7', '$8', '$9' );
 278
 279 # Get a message from anywhere
 280 function wfMsg( $key ) {
 281         global $wgRequest;
 282         if ( $wgRequest->getVal( 'debugmsg' ) ) {
 283                 if ( $key == 'linktrail' /* a special case where we want to return something specific */ )
 284                         return "/^()(.*)$/sD";
 285                 else
 286                         return $key;
 287         }
 288         $args = func_get_args();
 289         if ( count( $args ) ) {
 290                 array_shift( $args );
 291         }
 292         return wfMsgReal( $key, $args, true );
 293 }
 294
 295 # Get a message from the language file
 296 function wfMsgNoDB( $key ) {
 297         $args = func_get_args();
 298         if ( count( $args ) ) {
 299                 array_shift( $args );
 300         }
 301         return wfMsgReal( $key, $args, false );
 302 }
 303
 304 # Really get a message
 305 function wfMsgReal( $key, $args, $useDB ) {
 306         global $wgReplacementKeys, $wgMessageCache, $wgLang;
 307
 308         $fname = 'wfMsg';
 309         wfProfileIn( $fname );
 310         if ( $wgMessageCache ) {
 311                 $message = $wgMessageCache->get( $key, $useDB );
 312         } elseif ( $wgLang ) {
 313                 $message = $wgLang->getMessage( $key );
 314         } else {
 315                 wfDebug( "No language object when getting $key\n" );
 316                 $message = "&lt;$key&gt;";
 317         }
 318
 319         # Replace arguments
 320         if( count( $args ) ) {
 321                 $message = str_replace( $wgReplacementKeys, $args, $message );
 322         }
 323         wfProfileOut( $fname );
 324         return $message;
 325 }
 326
 327 # Just like exit() but makes a note of it.
 328 # Commits open transactions except if the error parameter is set
 329 function wfAbruptExit( $error = false ){
 330         global $wgLoadBalancer;
 331         static $called = false;
 332         if ( $called ){
 333                 exit();
 334         }
 335         $called = true;
 336
 337         if( function_exists( 'debug_backtrace' ) ){ // PHP >= 4.3
 338                 $bt = debug_backtrace();
 339                 for($i = 0; $i < count($bt) ; $i++){
 340                         $file = $bt[$i]['file'];
 341                         $line = $bt[$i]['line'];
 342                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 343                 }
 344         } else {
 345                 wfDebug('WARNING: Abrupt exit\n');
 346         }
 347         if ( !$error ) {
 348                 $wgLoadBalancer->closeAll();
 349         }
 350         exit();
 351 }
 352
 353 function wfErrorExit() {
 354         wfAbruptExit( true );
 355 }
 356
 357 # This is meant as a debugging aid to track down where bad data comes from.
 358 # Shouldn't be used in production code except maybe in "shouldn't happen" areas.
 359 #
 360 function wfDebugDieBacktrace( $msg = '' ) {
 361         global $wgCommandLineMode;
 362
 363         if ( function_exists( 'debug_backtrace' ) ) {
 364                 if ( $wgCommandLineMode ) {
 365                         $msg .= "\nBacktrace:\n";
 366                 } else {
 367                         $msg .= "\n<p>Backtrace:</p>\n<ul>\n";
 368                 }
 369                 $backtrace = debug_backtrace();
 370                 foreach( $backtrace as $call ) {
 371                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 372                         $file = $f[count($f)-1];
 373                         if ( $wgCommandLineMode ) {
 374                                 $msg .= "$file line {$call['line']} calls ";
 375                         } else {
 376                                 $msg .= '<li>' . $file . ' line ' . $call['line'] . ' calls ';
 377                         }
 378                         if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 379                         $msg .= $call['function'] . '()';
 380
 381                         if ( $wgCommandLineMode ) {
 382                                 $msg .= "\n";
 383                         } else {
 384                                 $msg .= "</li>\n";
 385                         }
 386                 }
 387          }
 388          die( $msg );
 389 }
 390
 391
 392 /* Some generic result counters, pulled out of SearchEngine */
 393
 394 function wfShowingResults( $offset, $limit )
 395 {
 396         global $wgLang;
 397         return wfMsg( 'showingresults', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 398 }
 399
 400 function wfShowingResultsNum( $offset, $limit, $num )
 401 {
 402         global $wgLang;
 403         return wfMsg( 'showingresultsnum', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 404 }
 405
 406 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false )
 407 {
 408         global $wgUser, $wgLang;
 409         $fmtLimit = $wgLang->formatNum( $limit );
 410         $prev = wfMsg( 'prevn', $fmtLimit );
 411         $next = wfMsg( 'nextn', $fmtLimit );
 412         $link = wfUrlencode( $link );
 413
 414         $sk = $wgUser->getSkin();
 415         if ( 0 != $offset ) {
 416                 $po = $offset - $limit;
 417                 if ( $po < 0 ) { $po = 0; }
 418                 $q = "limit={$limit}&offset={$po}";
 419                 if ( '' != $query ) { $q .= '&'.$query; }
 420                 $plink = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$prev}</a>";
 421         } else { $plink = $prev; }
 422
 423         $no = $offset + $limit;
 424         $q = 'limit='.$limit.'&offset='.$no;
 425         if ( '' != $query ) { $q .= '&'.$query; }
 426
 427         if ( $atend ) {
 428                 $nlink = $next;
 429         } else {
 430                 $nlink = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$next}</a>";
 431         }
 432         $nums = wfNumLink( $offset, 20, $link , $query ) . ' | ' .
 433           wfNumLink( $offset, 50, $link, $query ) . ' | ' .
 434           wfNumLink( $offset, 100, $link, $query ) . ' | ' .
 435           wfNumLink( $offset, 250, $link, $query ) . ' | ' .
 436           wfNumLink( $offset, 500, $link, $query );
 437
 438         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 439 }
 440
 441 function wfNumLink( $offset, $limit, $link, $query = '' )
 442 {
 443         global $wgUser, $wgLang;
 444         if ( '' == $query ) { $q = ''; }
 445         else { $q = $query.'&'; }
 446         $q .= 'limit='.$limit.'&offset='.$offset;
 447
 448         $fmtLimit = $wgLang->formatNum( $limit );
 449         $s = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$fmtLimit}</a>";
 450         return $s;
 451 }
 452
 453 function wfClientAcceptsGzip() {
 454         global $wgUseGzip;
 455         if( $wgUseGzip ) {
 456                 # FIXME: we may want to blacklist some broken browsers
 457                 if( preg_match(
 458                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 459                         $_SERVER['HTTP_ACCEPT_ENCODING'],
 460                         $m ) ) {
 461                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
 462                         wfDebug( " accepts gzip\n" );
 463                         return true;
 464                 }
 465         }
 466         return false;
 467 }
 468
 469 # Yay, more global functions!
 470 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
 471         global $wgRequest;
 472         return $wgRequest->getLimitOffset( $deflimit, $optionname );
 473 }
 474
 475 # Escapes the given text so that it may be output using addWikiText()
 476 # without any linking, formatting, etc. making its way through. This
 477 # is achieved by substituting certain characters with HTML entities.
 478 # As required by the callers, <nowiki> is not used. It currently does
 479 # not filter out characters which have special meaning only at the
 480 # start of a line, such as "*".
 481 function wfEscapeWikiText( $text )
 482 {
 483         $text = str_replace(
 484                 array( '[',             '|',      "'",     'ISBN '        , '://'         , "\n=", '{{' ),
 485                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', '&#58;//' , "\n&#61;", '&#123;&#123;' ),
 486                 htmlspecialchars($text) );
 487         return $text;
 488 }
 489
 490 function wfQuotedPrintable( $string, $charset = '' )
 491 {
 492         # Probably incomplete; see RFC 2045
 493         if( empty( $charset ) ) {
 494                 global $wgInputEncoding;
 495                 $charset = $wgInputEncoding;
 496         }
 497         $charset = strtoupper( $charset );
 498         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
 499
 500         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 501         $replace = $illegal . '\t ?_';
 502         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 503         $out = "=?$charset?Q?";
 504         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 505         $out .= '?=';
 506         return $out;
 507 }
 508
 509 function wfTime(){
 510         $st = explode( ' ', microtime() );
 511         return (float)$st[0] + (float)$st[1];
 512 }
 513
 514 # Changes the first character to an HTML entity
 515 function wfHtmlEscapeFirst( $text ) {
 516         $ord = ord($text);
 517         $newText = substr($text, 1);
 518         return "&#$ord;$newText";
 519 }
 520
 521 # Sets dest to source and returns the original value of dest
 522 # If source is NULL, it just returns the value, it doesn't set the variable
 523 function wfSetVar( &$dest, $source )
 524 {
 525         $temp = $dest;
 526         if ( !is_null( $source ) ) {
 527                 $dest = $source;
 528         }
 529         return $temp;
 530 }
 531
 532 # As for wfSetVar except setting a bit
 533 function wfSetBit( &$dest, $bit, $state = true ) {
 534         $temp = (bool)($dest & $bit );
 535         if ( !is_null( $state ) ) {
 536                 if ( $state ) {
 537                         $dest |= $bit;
 538                 } else {
 539                         $dest &= ~$bit;
 540                 }
 541         }
 542         return $temp;
 543 }
 544
 545 # This function takes two arrays as input, and returns a CGI-style string, e.g.
 546 # "days=7&limit=100". Options in the first array override options in the second.
 547 # Options set to "" will not be output.
 548 function wfArrayToCGI( $array1, $array2 = NULL )
 549 {
 550         if ( !is_null( $array2 ) ) {
 551                 $array1 = $array1 + $array2;
 552         }
 553
 554         $cgi = '';
 555         foreach ( $array1 as $key => $value ) {
 556                 if ( '' !== $value ) {
 557                         if ( '' != $cgi ) {
 558                                 $cgi .= '&';
 559                         }
 560                         $cgi .= $key.'='.$value;
 561                 }
 562         }
 563         return $cgi;
 564 }
 565
 566 # This is obsolete, use SquidUpdate::purge()
 567 function wfPurgeSquidServers ($urlArr) {
 568         SquidUpdate::purge( $urlArr );
 569 }
 570
 571 # Windows-compatible version of escapeshellarg()
 572 # Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
 573 # function puts single quotes in regardless of OS
 574 function wfEscapeShellArg( )
 575 {
 576         $args = func_get_args();
 577         $first = true;
 578         $retVal = '';
 579         foreach ( $args as $arg ) {
 580                 if ( !$first ) {
 581                         $retVal .= ' ';
 582                 } else {
 583                         $first = false;
 584                 }
 585
 586                 if ( wfIsWindows() ) {
 587                         $retVal .= '"' . str_replace( '"','\"', $arg ) . '"';
 588                 } else {
 589                         $retVal .= escapeshellarg( $arg );
 590                 }
 591         }
 592         return $retVal;
 593 }
 594
 595 # wfMerge attempts to merge differences between three texts.
 596 # Returns true for a clean merge and false for failure or a conflict.
 597
 598 function wfMerge( $old, $mine, $yours, &$result ){
 599         global $wgDiff3;
 600
 601         # This check may also protect against code injection in
 602         # case of broken installations.
 603         if(! file_exists( $wgDiff3 ) ){
 604                 return false;
 605         }
 606
 607         # Make temporary files
 608         $td = '/tmp/';
 609         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
 610         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
 611         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
 612
 613         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
 614         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
 615         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
 616
 617         # Check for a conflict
 618         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a --overlap-only ' .
 619           wfEscapeShellArg( $mytextName ) . ' ' .
 620           wfEscapeShellArg( $oldtextName ) . ' ' .
 621           wfEscapeShellArg( $yourtextName );
 622         $handle = popen( $cmd, 'r' );
 623
 624         if( fgets( $handle ) ){
 625                 $conflict = true;
 626         } else {
 627                 $conflict = false;
 628         }
 629         pclose( $handle );
 630
 631         # Merge differences
 632         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a -e --merge ' .
 633           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
 634         $handle = popen( $cmd, 'r' );
 635         $result = '';
 636         do {
 637                 $data = fread( $handle, 8192 );
 638                 if ( strlen( $data ) == 0 ) {
 639                         break;
 640                 }
 641                 $result .= $data;
 642         } while ( true );
 643         pclose( $handle );
 644         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
 645         return ! $conflict;
 646 }
 647
 648 function wfVarDump( $var )
 649 {
 650         global $wgOut;
 651         $s = str_replace("\n","<br>\n", var_export( $var, true ) . "\n");
 652         if ( headers_sent() || !@is_object( $wgOut ) ) {
 653                 print $s;
 654         } else {
 655                 $wgOut->addHTML( $s );
 656         }
 657 }
 658
 659 # Provide a simple HTTP error.
 660 function wfHttpError( $code, $label, $desc ) {
 661         global $wgOut;
 662         $wgOut->disable();
 663         header( "HTTP/1.0 $code $label" );
 664         header( "Status: $code $label" );
 665         $wgOut->sendCacheControl();
 666
 667         # Don't send content if it's a HEAD request.
 668         if( $_SERVER['REQUEST_METHOD'] == 'HEAD' ) {
 669                 header( 'Content-type: text/plain' );
 670                 print "$desc\n";
 671         }
 672 }
 673
 674 # Converts an Accept-* header into an array mapping string values to quality factors
 675 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
 676         # No arg means accept anything (per HTTP spec)
 677         if( !$accept ) {
 678                 return array( $def => 1 );
 679         }
 680
 681         $prefs = array();
 682
 683         $parts = explode( ',', $accept );
 684
 685         foreach( $parts as $part ) {
 686                 # FIXME: doesn't deal with params like 'text/html; level=1'
 687                 @list( $value, $qpart ) = explode( ';', $part );
 688                 if( !isset( $qpart ) ) {
 689                         $prefs[$value] = 1;
 690                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
 691                         $prefs[$value] = $match[1];
 692                 }
 693         }
 694
 695         return $prefs;
 696 }
 697
 698 /* private */ function mimeTypeMatch( $type, $avail ) {
 699         if( array_key_exists($type, $avail) ) {
 700                 return $type;
 701         } else {
 702                 $parts = explode( '/', $type );
 703                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
 704                         return $parts[0] . '/*';
 705                 } elseif( array_key_exists( '*/*', $avail ) ) {
 706                         return '*/*';
 707                 } else {
 708                         return NULL;
 709                 }
 710         }
 711 }
 712
 713 # FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
 714 # XXX: generalize to negotiate other stuff
 715 function wfNegotiateType( $cprefs, $sprefs ) {
 716         $combine = array();
 717
 718         foreach( array_keys($sprefs) as $type ) {
 719                 $parts = explode( '/', $type );
 720                 if( $parts[1] != '*' ) {
 721                         $ckey = mimeTypeMatch( $type, $cprefs );
 722                         if( $ckey ) {
 723                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
 724                         }
 725                 }
 726         }
 727
 728         foreach( array_keys( $cprefs ) as $type ) {
 729                 $parts = explode( '/', $type );
 730                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
 731                         $skey = mimeTypeMatch( $type, $sprefs );
 732                         if( $skey ) {
 733                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
 734                         }
 735                 }
 736         }
 737
 738         $bestq = 0;
 739         $besttype = NULL;
 740
 741         foreach( array_keys( $combine ) as $type ) {
 742                 if( $combine[$type] > $bestq ) {
 743                         $besttype = $type;
 744                         $bestq = $combine[$type];
 745                 }
 746         }
 747
 748         return $besttype;
 749 }
 750
 751 # Array lookup
 752 # Returns an array where the values in the first array are replaced by the
 753 # values in the second array with the corresponding keys
 754 function wfArrayLookup( $a, $b )
 755 {
 756         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
 757 }
 758
 759
 760 # Ideally we'd be using actual time fields in the db
 761 function wfTimestamp2Unix( $ts ) {
 762         return gmmktime( ( (int)substr( $ts, 8, 2) ),
 763                   (int)substr( $ts, 10, 2 ), (int)substr( $ts, 12, 2 ),
 764                   (int)substr( $ts, 4, 2 ), (int)substr( $ts, 6, 2 ),
 765                   (int)substr( $ts, 0, 4 ) );
 766 }
 767
 768 function wfUnix2Timestamp( $unixtime ) {
 769         return gmdate( 'YmdHis', $unixtime );
 770 }
 771
 772 function wfTimestampNow() {
 773         # return NOW
 774         return gmdate( 'YmdHis' );
 775 }
 776
 777 # Sorting hack for MySQL 3, which doesn't use index sorts for DESC
 778 function wfInvertTimestamp( $ts ) {
 779         return strtr(
 780                 $ts,
 781                 '0123456789',
 782                 '9876543210'
 783         );
 784 }
 785
 786 # Reference-counted warning suppression
 787 function wfSuppressWarnings( $end = false ) {
 788         static $suppressCount = 0;
 789         static $originalLevel = false;
 790
 791         if ( $end ) {
 792                 if ( $suppressCount ) {
 793                         $suppressCount --;
 794                         if ( !$suppressCount ) {
 795                                 error_reporting( $originalLevel );
 796                         }
 797                 }
 798         } else {
 799                 if ( !$suppressCount ) {
 800                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
 801                 }
 802                 $suppressCount++;
 803         }
 804 }
 805
 806 # Restore error level to previous value
 807 function wfRestoreWarnings() {
 808         wfSuppressWarnings( true );
 809 }
 810
 811 # Autodetect, convert and provide timestamps of various types
 812 define('TS_UNIX',0);    # Standard unix timestamp (number of seconds since 1 Jan 1970)
 813 define('TS_MW',1);      # Mediawiki concatenated string timestamp (yyyymmddhhmmss)
 814 define('TS_DB',2);      # Standard database timestamp (yyyy-mm-dd hh:mm:ss)
 815
 816 function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
 817         if (preg_match("/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
 818                 # TS_DB
 819                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
 820                             (int)$da[2],(int)$da[3],(int)$da[1]);
 821         } elseif (preg_match("/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/",$ts,$da)) {
 822                 # TS_MW
 823                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
 824                             (int)$da[2],(int)$da[3],(int)$da[1]);
 825         } elseif (preg_match("/^(\d{1,13})$/",$ts,$datearray)) {
 826                 # TS_UNIX
 827                 $uts=$ts;
 828         }
 829
 830         if ($ts==0)
 831                 $uts=time();
 832         switch($outputtype) {
 833         case TS_UNIX:
 834                 return $uts;
 835                 break;
 836         case TS_MW:
 837                 return gmdate( 'YmdHis', $uts );
 838                 break;
 839         case TS_DB:
 840                 return gmdate( 'Y-m-d H:i:s', $uts );
 841                 break;
 842         default:
 843                 return;
 844         }
 845 }
 846
 847 function wfIsWindows() {
 848         if (substr(php_uname(), 0, 7) == 'Windows') {
 849                 return true;
 850         } else {
 851                 return false;
 852         }
 853 }
 854
 855 ?>