includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 $wgTitleInterwikiCache = array();
  12 $wgTitleCache = array();
  13
  14 define ( 'GAID_FOR_UPDATE', 1 );
  15
  16 # Title::newFromTitle maintains a cache to avoid
  17 # expensive re-normalization of commonly used titles.
  18 # On a batch operation this can become a memory leak
  19 # if not bounded. After hitting this many titles,
  20 # reset the cache.
  21 define( 'MW_TITLECACHE_MAX', 1000 );
  22
  23 /**
  24  * Title class
  25  * - Represents a title, which may contain an interwiki designation or namespace
  26  * - Can fetch various kinds of data from the database, albeit inefficiently.
  27  *
  28  * @package MediaWiki
  29  */
  30 class Title {
  31         /**
  32          * All member variables should be considered private
  33          * Please use the accessor functions
  34          */
  35
  36          /**#@+
  37          * @access private
  38          */
  39
  40         var $mTextform;           # Text form (spaces not underscores) of the main part
  41         var $mUrlform;            # URL-encoded form of the main part
  42         var $mDbkeyform;          # Main part with underscores
  43         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  44         var $mInterwiki;          # Interwiki prefix (or null string)
  45         var $mFragment;           # Title fragment (i.e. the bit after the #)
  46         var $mArticleID;          # Article ID, fetched from the link cache on demand
  47         var $mLatestID;         # ID of most recent revision
  48         var $mRestrictions;       # Array of groups allowed to edit this article
  49                               # Only null or "sysop" are supported
  50         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  51         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  52         var $mDefaultNamespace;   # Namespace index when there is no namespace
  53                               # Zero except in {{transclusion}} tags
  54         var $mWatched;            # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  55         /**#@-*/
  56
  57
  58         /**
  59          * Constructor
  60          * @access private
  61          */
  62         /* private */ function Title() {
  63                 $this->mInterwiki = $this->mUrlform =
  64                 $this->mTextform = $this->mDbkeyform = '';
  65                 $this->mArticleID = -1;
  66                 $this->mNamespace = NS_MAIN;
  67                 $this->mRestrictionsLoaded = false;
  68                 $this->mRestrictions = array();
  69                 # Dont change the following, NS_MAIN is hardcoded in several place
  70                 # See bug #696
  71                 $this->mDefaultNamespace = NS_MAIN;
  72                 $this->mWatched = NULL;
  73                 $this->mLatestID = false;
  74         }
  75
  76         /**
  77          * Create a new Title from a prefixed DB key
  78          * @param string $key The database key, which has underscores
  79          *      instead of spaces, possibly including namespace and
  80          *      interwiki prefixes
  81          * @return Title the new object, or NULL on an error
  82          * @static
  83          * @access public
  84          */
  85         /* static */ function newFromDBkey( $key ) {
  86                 $t = new Title();
  87                 $t->mDbkeyform = $key;
  88                 if( $t->secureAndSplit() )
  89                         return $t;
  90                 else
  91                         return NULL;
  92         }
  93
  94         /**
  95          * Create a new Title from text, such as what one would
  96          * find in a link. Decodes any HTML entities in the text.
  97          *
  98          * @param string $text the link text; spaces, prefixes,
  99          *      and an initial ':' indicating the main namespace
 100          *      are accepted
 101          * @param int $defaultNamespace the namespace to use if
 102          *      none is specified by a prefix
 103          * @return Title the new object, or NULL on an error
 104          * @static
 105          * @access public
 106          */
 107         function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 108                 global $wgTitleCache;
 109                 $fname = 'Title::newFromText';
 110                 wfProfileIn( $fname );
 111
 112                 if( is_object( $text ) ) {
 113                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 114                 }
 115
 116                 /**
 117                  * Wiki pages often contain multiple links to the same page.
 118                  * Title normalization and parsing can become expensive on
 119                  * pages with many links, so we can save a little time by
 120                  * caching them.
 121                  *
 122                  * In theory these are value objects and won't get changed...
 123                  */
 124                 if( $defaultNamespace == NS_MAIN && isset( $wgTitleCache[$text] ) ) {
 125                         wfProfileOut( $fname );
 126                         return $wgTitleCache[$text];
 127                 }
 128
 129                 /**
 130                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 131                  */
 132                 $filteredText = Sanitizer::decodeCharReferences( $text );
 133
 134                 $t =& new Title();
 135                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 136                 $t->mDefaultNamespace = $defaultNamespace;
 137
 138                 if( $t->secureAndSplit() ) {
 139                         if( $defaultNamespace == NS_MAIN ) {
 140                                 if( count( $wgTitleCache ) >= MW_TITLECACHE_MAX ) {
 141                                         # Avoid memory leaks on mass operations...
 142                                         $wgTitleCache = array();
 143                                 }
 144                                 $wgTitleCache[$text] =& $t;
 145                         }
 146                         wfProfileOut( $fname );
 147                         return $t;
 148                 } else {
 149                         wfProfileOut( $fname );
 150                         $ret = NULL;
 151                         return $ret;
 152                 }
 153         }
 154
 155         /**
 156          * Create a new Title from URL-encoded text. Ensures that
 157          * the given title's length does not exceed the maximum.
 158          * @param string $url the title, as might be taken from a URL
 159          * @return Title the new object, or NULL on an error
 160          * @static
 161          * @access public
 162          */
 163         function newFromURL( $url ) {
 164                 global $wgLegalTitleChars;
 165                 $t = new Title();
 166
 167                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 168                 # but some URLs used it as a space replacement and they still come
 169                 # from some external search tools.
 170                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 171                         $url = str_replace( '+', ' ', $url );
 172                 }
 173
 174                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 175                 if( $t->secureAndSplit() ) {
 176                         return $t;
 177                 } else {
 178                         return NULL;
 179                 }
 180         }
 181
 182         /**
 183          * Create a new Title from an article ID
 184          *
 185          * @todo This is inefficiently implemented, the page row is requested
 186          *       but not used for anything else
 187          *
 188          * @param int $id the page_id corresponding to the Title to create
 189          * @return Title the new object, or NULL on an error
 190          * @access public
 191          * @static
 192          */
 193         function newFromID( $id ) {
 194                 $fname = 'Title::newFromID';
 195                 $dbr =& wfGetDB( DB_SLAVE );
 196                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 197                         array( 'page_id' => $id ), $fname );
 198                 if ( $row !== false ) {
 199                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 200                 } else {
 201                         $title = NULL;
 202                 }
 203                 return $title;
 204         }
 205
 206         /**
 207          * Create a new Title from a namespace index and a DB key.
 208          * It's assumed that $ns and $title are *valid*, for instance when
 209          * they came directly from the database or a special page name.
 210          * For convenience, spaces are converted to underscores so that
 211          * eg user_text fields can be used directly.
 212          *
 213          * @param int $ns the namespace of the article
 214          * @param string $title the unprefixed database key form
 215          * @return Title the new object
 216          * @static
 217          * @access public
 218          */
 219         function &makeTitle( $ns, $title ) {
 220                 $t =& new Title();
 221                 $t->mInterwiki = '';
 222                 $t->mFragment = '';
 223                 $t->mNamespace = intval( $ns );
 224                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 225                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 226                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 227                 $t->mTextform = str_replace( '_', ' ', $title );
 228                 return $t;
 229         }
 230
 231         /**
 232          * Create a new Title frrom a namespace index and a DB key.
 233          * The parameters will be checked for validity, which is a bit slower
 234          * than makeTitle() but safer for user-provided data.
 235          *
 236          * @param int $ns the namespace of the article
 237          * @param string $title the database key form
 238          * @return Title the new object, or NULL on an error
 239          * @static
 240          * @access public
 241          */
 242         function makeTitleSafe( $ns, $title ) {
 243                 $t = new Title();
 244                 $t->mDbkeyform = Title::makeName( $ns, $title );
 245                 if( $t->secureAndSplit() ) {
 246                         return $t;
 247                 } else {
 248                         return NULL;
 249                 }
 250         }
 251
 252         /**
 253          * Create a new Title for the Main Page
 254          *
 255          * @static
 256          * @return Title the new object
 257          * @access public
 258          */
 259         function newMainPage() {
 260                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 261         }
 262
 263         /**
 264          * Create a new Title for a redirect
 265          * @param string $text the redirect title text
 266          * @return Title the new object, or NULL if the text is not a
 267          *      valid redirect
 268          * @static
 269          * @access public
 270          */
 271         function newFromRedirect( $text ) {
 272                 global $wgMwRedir;
 273                 $rt = NULL;
 274                 if ( $wgMwRedir->matchStart( $text ) ) {
 275                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 276                                 # categories are escaped using : for example one can enter:
 277                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 278                                 if ( substr($m[1],0,1) == ':') {
 279                                         # We don't want to keep the ':'
 280                                         $m[1] = substr( $m[1], 1 );
 281                                 }
 282
 283                                 $rt = Title::newFromText( $m[1] );
 284                                 # Disallow redirects to Special:Userlogout
 285                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 286                                         $rt = NULL;
 287                                 }
 288                         }
 289                 }
 290                 return $rt;
 291         }
 292
 293 #----------------------------------------------------------------------------
 294 #       Static functions
 295 #----------------------------------------------------------------------------
 296
 297         /**
 298          * Get the prefixed DB key associated with an ID
 299          * @param int $id the page_id of the article
 300          * @return Title an object representing the article, or NULL
 301          *      if no such article was found
 302          * @static
 303          * @access public
 304          */
 305         function nameOf( $id ) {
 306                 $fname = 'Title::nameOf';
 307                 $dbr =& wfGetDB( DB_SLAVE );
 308
 309                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 310                 if ( $s === false ) { return NULL; }
 311
 312                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 313                 return $n;
 314         }
 315
 316         /**
 317          * Get a regex character class describing the legal characters in a link
 318          * @return string the list of characters, not delimited
 319          * @static
 320          * @access public
 321          */
 322         function legalChars() {
 323                 global $wgLegalTitleChars;
 324                 return $wgLegalTitleChars;
 325         }
 326
 327         /**
 328          * Get a string representation of a title suitable for
 329          * including in a search index
 330          *
 331          * @param int $ns a namespace index
 332          * @param string $title text-form main part
 333          * @return string a stripped-down title string ready for the
 334          *      search index
 335          */
 336         /* static */ function indexTitle( $ns, $title ) {
 337                 global $wgContLang;
 338                 require_once( 'SearchEngine.php' );
 339
 340                 $lc = SearchEngine::legalSearchChars() . '&#;';
 341                 $t = $wgContLang->stripForSearch( $title );
 342                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 343                 $t = strtolower( $t );
 344
 345                 # Handle 's, s'
 346                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 347                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 348
 349                 $t = preg_replace( "/\\s+/", ' ', $t );
 350
 351                 if ( $ns == NS_IMAGE ) {
 352                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 353                 }
 354                 return trim( $t );
 355         }
 356
 357         /*
 358          * Make a prefixed DB key from a DB key and a namespace index
 359          * @param int $ns numerical representation of the namespace
 360          * @param string $title the DB key form the title
 361          * @return string the prefixed form of the title
 362          */
 363         /* static */ function makeName( $ns, $title ) {
 364                 global $wgContLang;
 365
 366                 $n = $wgContLang->getNsText( $ns );
 367                 return $n == '' ? $title : "$n:$title";
 368         }
 369
 370         /**
 371          * Returns the URL associated with an interwiki prefix
 372          * @param string $key the interwiki prefix (e.g. "MeatBall")
 373          * @return the associated URL, containing "$1", which should be
 374          *      replaced by an article title
 375          * @static (arguably)
 376          * @access public
 377          */
 378         function getInterwikiLink( $key )  {
 379                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 380                 $fname = 'Title::getInterwikiLink';
 381
 382                 wfProfileIn( $fname );
 383
 384                 $key = strtolower( $key );
 385
 386                 $k = $wgDBname.':interwiki:'.$key;
 387                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 388                         wfProfileOut( $fname );
 389                         return $wgTitleInterwikiCache[$k]->iw_url;
 390                 }
 391
 392                 $s = $wgMemc->get( $k );
 393                 # Ignore old keys with no iw_local
 394                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 395                         $wgTitleInterwikiCache[$k] = $s;
 396                         wfProfileOut( $fname );
 397                         return $s->iw_url;
 398                 }
 399
 400                 $dbr =& wfGetDB( DB_SLAVE );
 401                 $res = $dbr->select( 'interwiki',
 402                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 403                         array( 'iw_prefix' => $key ), $fname );
 404                 if( !$res ) {
 405                         wfProfileOut( $fname );
 406                         return '';
 407                 }
 408
 409                 $s = $dbr->fetchObject( $res );
 410                 if( !$s ) {
 411                         # Cache non-existence: create a blank object and save it to memcached
 412                         $s = (object)false;
 413                         $s->iw_url = '';
 414                         $s->iw_local = 0;
 415                         $s->iw_trans = 0;
 416                 }
 417                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 418                 $wgTitleInterwikiCache[$k] = $s;
 419
 420                 wfProfileOut( $fname );
 421                 return $s->iw_url;
 422         }
 423
 424         /**
 425          * Determine whether the object refers to a page within
 426          * this project.
 427          *
 428          * @return bool TRUE if this is an in-project interwiki link
 429          *      or a wikilink, FALSE otherwise
 430          * @access public
 431          */
 432         function isLocal() {
 433                 global $wgTitleInterwikiCache, $wgDBname;
 434
 435                 if ( $this->mInterwiki != '' ) {
 436                         # Make sure key is loaded into cache
 437                         $this->getInterwikiLink( $this->mInterwiki );
 438                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 439                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 440                 } else {
 441                         return true;
 442                 }
 443         }
 444
 445         /**
 446          * Determine whether the object refers to a page within
 447          * this project and is transcludable.
 448          *
 449          * @return bool TRUE if this is transcludable
 450          * @access public
 451          */
 452         function isTrans() {
 453                 global $wgTitleInterwikiCache, $wgDBname;
 454
 455                 if ($this->mInterwiki == '' || !$this->isLocal())
 456                         return false;
 457                 # Make sure key is loaded into cache
 458                 $this->getInterwikiLink( $this->mInterwiki );
 459                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 460                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 461         }
 462
 463         /**
 464          * Update the page_touched field for an array of title objects
 465          * @todo Inefficient unless the IDs are already loaded into the
 466          *      link cache
 467          * @param array $titles an array of Title objects to be touched
 468          * @param string $timestamp the timestamp to use instead of the
 469          *      default current time
 470          * @static
 471          * @access public
 472          */
 473         function touchArray( $titles, $timestamp = '' ) {
 474
 475                 if ( count( $titles ) == 0 ) {
 476                         return;
 477                 }
 478                 $dbw =& wfGetDB( DB_MASTER );
 479                 if ( $timestamp == '' ) {
 480                         $timestamp = $dbw->timestamp();
 481                 }
 482                 /*
 483                 $page = $dbw->tableName( 'page' );
 484                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 485                 $first = true;
 486
 487                 foreach ( $titles as $title ) {
 488                         if ( $wgUseFileCache ) {
 489                                 $cm = new CacheManager($title);
 490                                 @unlink($cm->fileCacheName());
 491                         }
 492
 493                         if ( ! $first ) {
 494                                 $sql .= ',';
 495                         }
 496                         $first = false;
 497                         $sql .= $title->getArticleID();
 498                 }
 499                 $sql .= ')';
 500                 if ( ! $first ) {
 501                         $dbw->query( $sql, 'Title::touchArray' );
 502                 }
 503                 */
 504                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 505                 // do them in small chunks:
 506                 $fname = 'Title::touchArray';
 507                 foreach( $titles as $title ) {
 508                         $dbw->update( 'page',
 509                                 array( 'page_touched' => $timestamp ),
 510                                 array(
 511                                         'page_namespace' => $title->getNamespace(),
 512                                         'page_title'     => $title->getDBkey() ),
 513                                 $fname );
 514                 }
 515         }
 516
 517 #----------------------------------------------------------------------------
 518 #       Other stuff
 519 #----------------------------------------------------------------------------
 520
 521         /** Simple accessors */
 522         /**
 523          * Get the text form (spaces not underscores) of the main part
 524          * @return string
 525          * @access public
 526          */
 527         function getText() { return $this->mTextform; }
 528         /**
 529          * Get the URL-encoded form of the main part
 530          * @return string
 531          * @access public
 532          */
 533         function getPartialURL() { return $this->mUrlform; }
 534         /**
 535          * Get the main part with underscores
 536          * @return string
 537          * @access public
 538          */
 539         function getDBkey() { return $this->mDbkeyform; }
 540         /**
 541          * Get the namespace index, i.e. one of the NS_xxxx constants
 542          * @return int
 543          * @access public
 544          */
 545         function getNamespace() { return $this->mNamespace; }
 546         /**
 547          * Get the namespace text
 548          * @return string
 549          * @access public
 550          */
 551         function getNsText() {
 552                 global $wgContLang;
 553                 return $wgContLang->getNsText( $this->mNamespace );
 554         }
 555         /**
 556          * Get the namespace text of the subject (rather than talk) page
 557          * @return string
 558          * @access public
 559          */
 560         function getSubjectNsText() {
 561                 global $wgContLang;
 562                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 563         }
 564
 565         /**
 566          * Get the interwiki prefix (or null string)
 567          * @return string
 568          * @access public
 569          */
 570         function getInterwiki() { return $this->mInterwiki; }
 571         /**
 572          * Get the Title fragment (i.e. the bit after the #)
 573          * @return string
 574          * @access public
 575          */
 576         function getFragment() { return $this->mFragment; }
 577         /**
 578          * Get the default namespace index, for when there is no namespace
 579          * @return int
 580          * @access public
 581          */
 582         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 583
 584         /**
 585          * Get title for search index
 586          * @return string a stripped-down title string ready for the
 587          *      search index
 588          */
 589         function getIndexTitle() {
 590                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 591         }
 592
 593         /**
 594          * Get the prefixed database key form
 595          * @return string the prefixed title, with underscores and
 596          *      any interwiki and namespace prefixes
 597          * @access public
 598          */
 599         function getPrefixedDBkey() {
 600                 $s = $this->prefix( $this->mDbkeyform );
 601                 $s = str_replace( ' ', '_', $s );
 602                 return $s;
 603         }
 604
 605         /**
 606          * Get the prefixed title with spaces.
 607          * This is the form usually used for display
 608          * @return string the prefixed title, with spaces
 609          * @access public
 610          */
 611         function getPrefixedText() {
 612                 global $wgContLang;
 613                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 614                         $s = $this->prefix( $this->mTextform );
 615                         $s = str_replace( '_', ' ', $s );
 616                         $this->mPrefixedText = $s;
 617                 }
 618                 return $this->mPrefixedText;
 619         }
 620
 621         /**
 622          * Get the prefixed title with spaces, plus any fragment
 623          * (part beginning with '#')
 624          * @return string the prefixed title, with spaces and
 625          *      the fragment, including '#'
 626          * @access public
 627          */
 628         function getFullText() {
 629                 global $wgContLang;
 630                 $text = $this->getPrefixedText();
 631                 if( '' != $this->mFragment ) {
 632                         $text .= '#' . $this->mFragment;
 633                 }
 634                 return $text;
 635         }
 636
 637         /**
 638          * Get a URL-encoded title (not an actual URL) including interwiki
 639          * @return string the URL-encoded form
 640          * @access public
 641          */
 642         function getPrefixedURL() {
 643                 $s = $this->prefix( $this->mDbkeyform );
 644                 $s = str_replace( ' ', '_', $s );
 645
 646                 $s = wfUrlencode ( $s ) ;
 647
 648                 # Cleaning up URL to make it look nice -- is this safe?
 649                 $s = str_replace( '%28', '(', $s );
 650                 $s = str_replace( '%29', ')', $s );
 651
 652                 return $s;
 653         }
 654
 655         /**
 656          * Get a real URL referring to this title, with interwiki link and
 657          * fragment
 658          *
 659          * @param string $query an optional query string, not used
 660          *      for interwiki links
 661          * @return string the URL
 662          * @access public
 663          */
 664         function getFullURL( $query = '' ) {
 665                 global $wgContLang, $wgServer;
 666
 667                 if ( '' == $this->mInterwiki ) {
 668                         $url = $wgServer . $this->getLocalUrl( $query );
 669                 } else {
 670                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 671
 672                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 673                         if ( '' != $namespace ) {
 674                                 # Can this actually happen? Interwikis shouldn't be parsed.
 675                                 $namespace .= ':';
 676                         }
 677                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 678                         if( $query != '' ) {
 679                                 if( false === strpos( $url, '?' ) ) {
 680                                         $url .= '?';
 681                                 } else {
 682                                         $url .= '&';
 683                                 }
 684                                 $url .= $query;
 685                         }
 686                         if ( '' != $this->mFragment ) {
 687                                 $url .= '#' . $this->mFragment;
 688                         }
 689                 }
 690                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 691                 return $url;
 692         }
 693
 694         /**
 695          * Get a URL with no fragment or server name.  If this page is generated
 696          * with action=render, $wgServer is prepended.
 697          * @param string $query an optional query string; if not specified,
 698          *      $wgArticlePath will be used.
 699          * @return string the URL
 700          * @access public
 701          */
 702         function getLocalURL( $query = '' ) {
 703                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 704
 705                 if ( $this->isExternal() ) {
 706                         $url = $this->getFullURL();
 707                 } else {
 708                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 709                         if ( $query == '' ) {
 710                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
 711                         } else {
 712                                 global $wgActionPaths;
 713                                 $url = false;
 714                                 if( !empty( $wgActionPaths ) &&
 715                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 716                                 {
 717                                         $action = urldecode( $matches[2] );
 718                                         if( isset( $wgActionPaths[$action] ) ) {
 719                                                 $query = $matches[1];
 720                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 721                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 722                                                 if( $query != '' ) $url .= '?' . $query;
 723                                         }
 724                                 }
 725                                 if ( $url === false ) {
 726                                         if ( $query == '-' ) {
 727                                                 $query = '';
 728                                         }
 729                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 730                                 }
 731                         }
 732
 733                         if ($wgRequest->getText('action') == 'render') {
 734                                 $url = $wgServer . $url;
 735                         }
 736                 }
 737                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 738                 return $url;
 739         }
 740
 741         /**
 742          * Get an HTML-escaped version of the URL form, suitable for
 743          * using in a link, without a server name or fragment
 744          * @param string $query an optional query string
 745          * @return string the URL
 746          * @access public
 747          */
 748         function escapeLocalURL( $query = '' ) {
 749                 return htmlspecialchars( $this->getLocalURL( $query ) );
 750         }
 751
 752         /**
 753          * Get an HTML-escaped version of the URL form, suitable for
 754          * using in a link, including the server name and fragment
 755          *
 756          * @return string the URL
 757          * @param string $query an optional query string
 758          * @access public
 759          */
 760         function escapeFullURL( $query = '' ) {
 761                 return htmlspecialchars( $this->getFullURL( $query ) );
 762         }
 763
 764         /**
 765          * Get the URL form for an internal link.
 766          * - Used in various Squid-related code, in case we have a different
 767          * internal hostname for the server from the exposed one.
 768          *
 769          * @param string $query an optional query string
 770          * @return string the URL
 771          * @access public
 772          */
 773         function getInternalURL( $query = '' ) {
 774                 global $wgInternalServer;
 775                 $url = $wgInternalServer . $this->getLocalURL( $query );
 776                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 777                 return $url;
 778         }
 779
 780         /**
 781          * Get the edit URL for this Title
 782          * @return string the URL, or a null string if this is an
 783          *      interwiki link
 784          * @access public
 785          */
 786         function getEditURL() {
 787                 global $wgServer, $wgScript;
 788
 789                 if ( '' != $this->mInterwiki ) { return ''; }
 790                 $s = $this->getLocalURL( 'action=edit' );
 791
 792                 return $s;
 793         }
 794
 795         /**
 796          * Get the HTML-escaped displayable text form.
 797          * Used for the title field in <a> tags.
 798          * @return string the text, including any prefixes
 799          * @access public
 800          */
 801         function getEscapedText() {
 802                 return htmlspecialchars( $this->getPrefixedText() );
 803         }
 804
 805         /**
 806          * Is this Title interwiki?
 807          * @return boolean
 808          * @access public
 809          */
 810         function isExternal() { return ( '' != $this->mInterwiki ); }
 811
 812         /**
 813          * Does the title correspond to a protected article?
 814          * @param string $what the action the page is protected from,
 815          *      by default checks move and edit
 816          * @return boolean
 817          * @access public
 818          */
 819         function isProtected($action = '') {
 820                 if ( -1 == $this->mNamespace ) { return true; }
 821                 if($action == 'edit' || $action == '') {
 822                         $a = $this->getRestrictions("edit");
 823                         if ( in_array( 'sysop', $a ) ) { return true; }
 824                 }
 825                 if($action == 'move' || $action == '') {
 826                         $a = $this->getRestrictions("move");
 827                         if ( in_array( 'sysop', $a ) ) { return true; }
 828                 }
 829                 return false;
 830         }
 831
 832         /**
 833          * Is $wgUser is watching this page?
 834          * @return boolean
 835          * @access public
 836          */
 837         function userIsWatching() {
 838                 global $wgUser;
 839
 840                 if ( is_null( $this->mWatched ) ) {
 841                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 842                                 $this->mWatched = false;
 843                         } else {
 844                                 $this->mWatched = $wgUser->isWatched( $this );
 845                         }
 846                 }
 847                 return $this->mWatched;
 848         }
 849
 850         /**
 851          * Can $wgUser perform $action this page?
 852          * @param string $action action that permission needs to be checked for
 853          * @return boolean
 854          * @access private
 855          */
 856         function userCan($action) {
 857                 $fname = 'Title::userCan';
 858                 wfProfileIn( $fname );
 859
 860                 global $wgUser;
 861                 if( NS_SPECIAL == $this->mNamespace ) {
 862                         wfProfileOut( $fname );
 863                         return false;
 864                 }
 865                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
 866                 // from taking effect -ævar
 867                 if( NS_MEDIAWIKI == $this->mNamespace &&
 868                     !$wgUser->isAllowed('editinterface') ) {
 869                         wfProfileOut( $fname );
 870                         return false;
 871                 }
 872
 873                 if( $this->mDbkeyform == '_' ) {
 874                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 875                         wfProfileOut( $fname );
 876                         return false;
 877                 }
 878
 879                 # protect global styles and js
 880                 if ( NS_MEDIAWIKI == $this->mNamespace
 881                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 882                      && !$wgUser->isAllowed('editinterface') ) {
 883                         wfProfileOut( $fname );
 884                         return false;
 885                 }
 886
 887                 # protect css/js subpages of user pages
 888                 # XXX: this might be better using restrictions
 889                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 890                 if( NS_USER == $this->mNamespace
 891                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 892                         && !$wgUser->isAllowed('editinterface')
 893                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 894                         wfProfileOut( $fname );
 895                         return false;
 896                 }
 897
 898                 foreach( $this->getRestrictions($action) as $right ) {
 899                         // Backwards compatibility, rewrite sysop -> protect
 900                         if ( $right == 'sysop' ) {
 901                                 $right = 'protect';
 902                         }
 903                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 904                                 wfProfileOut( $fname );
 905                                 return false;
 906                         }
 907                 }
 908
 909                 if( $action == 'move' &&
 910                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 911                         wfProfileOut( $fname );
 912                         return false;
 913                 }
 914
 915                 if( $action == 'create' ) {
 916                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
 917                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
 918                                 return false;
 919                         }
 920                 }
 921
 922                 wfProfileOut( $fname );
 923                 return true;
 924         }
 925
 926         /**
 927          * Can $wgUser edit this page?
 928          * @return boolean
 929          * @access public
 930          */
 931         function userCanEdit() {
 932                 return $this->userCan('edit');
 933         }
 934
 935         /**
 936          * Can $wgUser move this page?
 937          * @return boolean
 938          * @access public
 939          */
 940         function userCanMove() {
 941                 return $this->userCan('move');
 942         }
 943
 944         /**
 945          * Would anybody with sufficient privileges be able to move this page?
 946          * Some pages just aren't movable.
 947          *
 948          * @return boolean
 949          * @access public
 950          */
 951         function isMovable() {
 952                 return Namespace::isMovable( $this->getNamespace() )
 953                         && $this->getInterwiki() == '';
 954         }
 955
 956         /**
 957          * Can $wgUser read this page?
 958          * @return boolean
 959          * @access public
 960          */
 961         function userCanRead() {
 962                 global $wgUser;
 963
 964                 if( $wgUser->isAllowed('read') ) {
 965                         return true;
 966                 } else {
 967                         global $wgWhitelistRead;
 968
 969                         /** If anon users can create an account,
 970                             they need to reach the login page first! */
 971                         if( $wgUser->isAllowed( 'createaccount' )
 972                             && $this->getNamespace() == NS_SPECIAL
 973                             && $this->getText() == 'Userlogin' ) {
 974                                 return true;
 975                         }
 976
 977                         /** some pages are explicitly allowed */
 978                         $name = $this->getPrefixedText();
 979                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
 980                                 return true;
 981                         }
 982
 983                         # Compatibility with old settings
 984                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
 985                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 986                                         return true;
 987                                 }
 988                         }
 989                 }
 990                 return false;
 991         }
 992
 993         /**
 994          * Is this a talk page of some sort?
 995          * @return bool
 996          * @access public
 997          */
 998         function isTalkPage() {
 999                 return Namespace::isTalk( $this->getNamespace() );
1000         }
1001
1002         /**
1003          * Is this a .css or .js subpage of a user page?
1004          * @return bool
1005          * @access public
1006          */
1007         function isCssJsSubpage() {
1008                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1009         }
1010         /**
1011          * Is this a .css subpage of a user page?
1012          * @return bool
1013          * @access public
1014          */
1015         function isCssSubpage() {
1016                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1017         }
1018         /**
1019          * Is this a .js subpage of a user page?
1020          * @return bool
1021          * @access public
1022          */
1023         function isJsSubpage() {
1024                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1025         }
1026         /**
1027          * Protect css/js subpages of user pages: can $wgUser edit
1028          * this page?
1029          *
1030          * @return boolean
1031          * @todo XXX: this might be better using restrictions
1032          * @access public
1033          */
1034         function userCanEditCssJsSubpage() {
1035                 global $wgUser;
1036                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1037         }
1038
1039         /**
1040          * Loads a string into mRestrictions array
1041          * @param string $res restrictions in string format
1042          * @access public
1043          */
1044         function loadRestrictions( $res ) {
1045                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1046                         $temp = explode( '=', trim( $restrict ) );
1047                         if(count($temp) == 1) {
1048                                 // old format should be treated as edit/move restriction
1049                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1050                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1051                         } else {
1052                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1053                         }
1054                 }
1055                 $this->mRestrictionsLoaded = true;
1056         }
1057
1058         /**
1059          * Accessor/initialisation for mRestrictions
1060          * @param string $action action that permission needs to be checked for
1061          * @return array the array of groups allowed to edit this article
1062          * @access public
1063          */
1064         function getRestrictions($action) {
1065                 $id = $this->getArticleID();
1066                 if ( 0 == $id ) { return array(); }
1067
1068                 if ( ! $this->mRestrictionsLoaded ) {
1069                         $dbr =& wfGetDB( DB_SLAVE );
1070                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1071                         $this->loadRestrictions( $res );
1072                 }
1073                 if( isset( $this->mRestrictions[$action] ) ) {
1074                         return $this->mRestrictions[$action];
1075                 }
1076                 return array();
1077         }
1078
1079         /**
1080          * Is there a version of this page in the deletion archive?
1081          * @return int the number of archived revisions
1082          * @access public
1083          */
1084         function isDeleted() {
1085                 $fname = 'Title::isDeleted';
1086                 if ( $this->getNamespace() < 0 ) {
1087                         $n = 0;
1088                 } else {
1089                         $dbr =& wfGetDB( DB_SLAVE );
1090                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1091                                 'ar_title' => $this->getDBkey() ), $fname );
1092                 }
1093                 return (int)$n;
1094         }
1095
1096         /**
1097          * Get the article ID for this Title from the link cache,
1098          * adding it if necessary
1099          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1100          *      for update
1101          * @return int the ID
1102          * @access public
1103          */
1104         function getArticleID( $flags = 0 ) {
1105                 $linkCache =& LinkCache::singleton();
1106                 if ( $flags & GAID_FOR_UPDATE ) {
1107                         $oldUpdate = $linkCache->forUpdate( true );
1108                         $this->mArticleID = $linkCache->addLinkObj( $this );
1109                         $linkCache->forUpdate( $oldUpdate );
1110                 } else {
1111                         if ( -1 == $this->mArticleID ) {
1112                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1113                         }
1114                 }
1115                 return $this->mArticleID;
1116         }
1117
1118         function getLatestRevID() {
1119                 if ($this->mLatestID !== false)
1120                         return $this->mLatestID;
1121
1122                 $db =& wfGetDB(DB_SLAVE);
1123                 return $this->mLatestID = $db->selectField( 'revision',
1124                         "max(rev_id)",
1125                         array('rev_page' => $this->getArticleID()),
1126                         'Title::getLatestRevID' );
1127         }
1128
1129         /**
1130          * This clears some fields in this object, and clears any associated
1131          * keys in the "bad links" section of the link cache.
1132          *
1133          * - This is called from Article::insertNewArticle() to allow
1134          * loading of the new page_id. It's also called from
1135          * Article::doDeleteArticle()
1136          *
1137          * @param int $newid the new Article ID
1138          * @access public
1139          */
1140         function resetArticleID( $newid ) {
1141                 $linkCache =& LinkCache::singleton();
1142                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1143
1144                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1145                 else { $this->mArticleID = $newid; }
1146                 $this->mRestrictionsLoaded = false;
1147                 $this->mRestrictions = array();
1148         }
1149
1150         /**
1151          * Updates page_touched for this page; called from LinksUpdate.php
1152          * @return bool true if the update succeded
1153          * @access public
1154          */
1155         function invalidateCache() {
1156                 global $wgUseFileCache;
1157
1158                 if ( wfReadOnly() ) {
1159                         return;
1160                 }
1161
1162                 $dbw =& wfGetDB( DB_MASTER );
1163                 $success = $dbw->update( 'page',
1164                         array( /* SET */
1165                                 'page_touched' => $dbw->timestamp()
1166                         ), array( /* WHERE */
1167                                 'page_namespace' => $this->getNamespace() ,
1168                                 'page_title' => $this->getDBkey()
1169                         ), 'Title::invalidateCache'
1170                 );
1171
1172                 if ($wgUseFileCache) {
1173                         $cache = new CacheManager($this);
1174                         @unlink($cache->fileCacheName());
1175                 }
1176
1177                 return $success;
1178         }
1179
1180         /**
1181          * Prefix some arbitrary text with the namespace or interwiki prefix
1182          * of this object
1183          *
1184          * @param string $name the text
1185          * @return string the prefixed text
1186          * @access private
1187          */
1188         /* private */ function prefix( $name ) {
1189                 global $wgContLang;
1190
1191                 $p = '';
1192                 if ( '' != $this->mInterwiki ) {
1193                         $p = $this->mInterwiki . ':';
1194                 }
1195                 if ( 0 != $this->mNamespace ) {
1196                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1197                 }
1198                 return $p . $name;
1199         }
1200
1201         /**
1202          * Secure and split - main initialisation function for this object
1203          *
1204          * Assumes that mDbkeyform has been set, and is urldecoded
1205          * and uses underscores, but not otherwise munged.  This function
1206          * removes illegal characters, splits off the interwiki and
1207          * namespace prefixes, sets the other forms, and canonicalizes
1208          * everything.
1209          * @return bool true on success
1210          * @access private
1211          */
1212         /* private */ function secureAndSplit() {
1213                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1214                 $fname = 'Title::secureAndSplit';
1215                 wfProfileIn( $fname );
1216
1217                 # Initialisation
1218                 static $rxTc = false;
1219                 if( !$rxTc ) {
1220                         # % is needed as well
1221                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1222                 }
1223
1224                 $this->mInterwiki = $this->mFragment = '';
1225                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1226
1227                 # Clean up whitespace
1228                 #
1229                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1230                 $t = trim( $t, '_' );
1231
1232                 if ( '' == $t ) {
1233                         wfProfileOut( $fname );
1234                         return false;
1235                 }
1236
1237                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1238                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1239                         wfProfileOut( $fname );
1240                         return false;
1241                 }
1242
1243                 $this->mDbkeyform = $t;
1244
1245                 # Initial colon indicates main namespace rather than specified default
1246                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1247                 if ( ':' == $t{0} ) {
1248                         $this->mNamespace = NS_MAIN;
1249                         $t = substr( $t, 1 ); # remove the colon but continue processing
1250                 }
1251
1252                 # Namespace or interwiki prefix
1253                 $firstPass = true;
1254                 do {
1255                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1256                                 $p = $m[1];
1257                                 $lowerNs = strtolower( $p );
1258                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1259                                         # Canonical namespace
1260                                         $t = $m[2];
1261                                         $this->mNamespace = $ns;
1262                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1263                                         # Ordinary namespace
1264                                         $t = $m[2];
1265                                         $this->mNamespace = $ns;
1266                                 } elseif( $this->getInterwikiLink( $p ) ) {
1267                                         if( !$firstPass ) {
1268                                                 # Can't make a local interwiki link to an interwiki link.
1269                                                 # That's just crazy!
1270                                                 wfProfileOut( $fname );
1271                                                 return false;
1272                                         }
1273
1274                                         # Interwiki link
1275                                         $t = $m[2];
1276                                         $this->mInterwiki = strtolower( $p );
1277
1278                                         # Redundant interwiki prefix to the local wiki
1279                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1280                                                 if( $t == '' ) {
1281                                                         # Can't have an empty self-link
1282                                                         wfProfileOut( $fname );
1283                                                         return false;
1284                                                 }
1285                                                 $this->mInterwiki = '';
1286                                                 $firstPass = false;
1287                                                 # Do another namespace split...
1288                                                 continue;
1289                                         }
1290                                 }
1291                                 # If there's no recognized interwiki or namespace,
1292                                 # then let the colon expression be part of the title.
1293                         }
1294                         break;
1295                 } while( true );
1296                 $r = $t;
1297
1298                 # We already know that some pages won't be in the database!
1299                 #
1300                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1301                         $this->mArticleID = 0;
1302                 }
1303                 $f = strstr( $r, '#' );
1304                 if ( false !== $f ) {
1305                         $this->mFragment = substr( $f, 1 );
1306                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1307                         # remove whitespace again: prevents "Foo_bar_#"
1308                         # becoming "Foo_bar_"
1309                         $r = preg_replace( '/_*$/', '', $r );
1310                 }
1311
1312                 # Reject illegal characters.
1313                 #
1314                 if( preg_match( $rxTc, $r ) ) {
1315                         wfProfileOut( $fname );
1316                         return false;
1317                 }
1318
1319                 /**
1320                  * Pages with "/./" or "/../" appearing in the URLs will
1321                  * often be unreachable due to the way web browsers deal
1322                  * with 'relative' URLs. Forbid them explicitly.
1323                  */
1324                 if ( strpos( $r, '.' ) !== false &&
1325                      ( $r === '.' || $r === '..' ||
1326                        strpos( $r, './' ) === 0  ||
1327                        strpos( $r, '../' ) === 0 ||
1328                        strpos( $r, '/./' ) !== false ||
1329                        strpos( $r, '/../' ) !== false ) )
1330                 {
1331                         wfProfileOut( $fname );
1332                         return false;
1333                 }
1334
1335                 # We shouldn't need to query the DB for the size.
1336                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1337                 if ( strlen( $r ) > 255 ) {
1338                         wfProfileOut( $fname );
1339                         return false;
1340                 }
1341
1342                 /**
1343                  * Normally, all wiki links are forced to have
1344                  * an initial capital letter so [[foo]] and [[Foo]]
1345                  * point to the same place.
1346                  *
1347                  * Don't force it for interwikis, since the other
1348                  * site might be case-sensitive.
1349                  */
1350                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1351                         $t = $wgContLang->ucfirst( $r );
1352                 } else {
1353                         $t = $r;
1354                 }
1355
1356                 /**
1357                  * Can't make a link to a namespace alone...
1358                  * "empty" local links can only be self-links
1359                  * with a fragment identifier.
1360                  */
1361                 if( $t == '' &&
1362                         $this->mInterwiki == '' &&
1363                         $this->mNamespace != NS_MAIN ) {
1364                         wfProfileOut( $fname );
1365                         return false;
1366                 }
1367
1368                 # Fill fields
1369                 $this->mDbkeyform = $t;
1370                 $this->mUrlform = wfUrlencode( $t );
1371
1372                 $this->mTextform = str_replace( '_', ' ', $t );
1373
1374                 wfProfileOut( $fname );
1375                 return true;
1376         }
1377
1378         /**
1379          * Get a Title object associated with the talk page of this article
1380          * @return Title the object for the talk page
1381          * @access public
1382          */
1383         function getTalkPage() {
1384                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1385         }
1386
1387         /**
1388          * Get a title object associated with the subject page of this
1389          * talk page
1390          *
1391          * @return Title the object for the subject page
1392          * @access public
1393          */
1394         function getSubjectPage() {
1395                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1396         }
1397
1398         /**
1399          * Get an array of Title objects linking to this Title
1400          * Also stores the IDs in the link cache.
1401          *
1402          * @param string $options may be FOR UPDATE
1403          * @return array the Title objects linking here
1404          * @access public
1405          */
1406         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1407                 $linkCache =& LinkCache::singleton();
1408                 $id = $this->getArticleID();
1409
1410                 if ( $options ) {
1411                         $db =& wfGetDB( DB_MASTER );
1412                 } else {
1413                         $db =& wfGetDB( DB_SLAVE );
1414                 }
1415
1416                 $res = $db->select( array( 'page', $table ),
1417                         array( 'page_namespace', 'page_title', 'page_id' ),
1418                         array(
1419                                 "{$prefix}_from=page_id",
1420                                 "{$prefix}_namespace" => $this->getNamespace(),
1421                                 "{$prefix}_title"     => $this->getDbKey() ),
1422                         'Title::getLinksTo',
1423                         $options );
1424
1425                 $retVal = array();
1426                 if ( $db->numRows( $res ) ) {
1427                         while ( $row = $db->fetchObject( $res ) ) {
1428                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1429                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1430                                         $retVal[] = $titleObj;
1431                                 }
1432                         }
1433                 }
1434                 $db->freeResult( $res );
1435                 return $retVal;
1436         }
1437
1438         /**
1439          * Get an array of Title objects using this Title as a template
1440          * Also stores the IDs in the link cache.
1441          *
1442          * @param string $options may be FOR UPDATE
1443          * @return array the Title objects linking here
1444          * @access public
1445          */
1446         function getTemplateLinksTo( $options = '' ) {
1447                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1448         }
1449
1450         /**
1451          * Get an array of Title objects referring to non-existent articles linked from this page
1452          *
1453          * @param string $options may be FOR UPDATE
1454          * @return array the Title objects
1455          * @access public
1456          */
1457         function getBrokenLinksFrom( $options = '' ) {
1458                 if ( $options ) {
1459                         $db =& wfGetDB( DB_MASTER );
1460                 } else {
1461                         $db =& wfGetDB( DB_SLAVE );
1462                 }
1463
1464                 $res = $db->safeQuery(
1465                           "SELECT pl_namespace, pl_title
1466                              FROM !
1467                         LEFT JOIN !
1468                                ON pl_namespace=page_namespace
1469                               AND pl_title=page_title
1470                             WHERE pl_from=?
1471                               AND page_namespace IS NULL
1472                                   !",
1473                         $db->tableName( 'pagelinks' ),
1474                         $db->tableName( 'page' ),
1475                         $this->getArticleId(),
1476                         $options );
1477
1478                 $retVal = array();
1479                 if ( $db->numRows( $res ) ) {
1480                         while ( $row = $db->fetchObject( $res ) ) {
1481                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1482                         }
1483                 }
1484                 $db->freeResult( $res );
1485                 return $retVal;
1486         }
1487
1488
1489         /**
1490          * Get a list of URLs to purge from the Squid cache when this
1491          * page changes
1492          *
1493          * @return array the URLs
1494          * @access public
1495          */
1496         function getSquidURLs() {
1497                 return array(
1498                         $this->getInternalURL(),
1499                         $this->getInternalURL( 'action=history' )
1500                 );
1501         }
1502
1503         /**
1504          * Move this page without authentication
1505          * @param Title &$nt the new page Title
1506          * @access public
1507          */
1508         function moveNoAuth( &$nt ) {
1509                 return $this->moveTo( $nt, false );
1510         }
1511
1512         /**
1513          * Check whether a given move operation would be valid.
1514          * Returns true if ok, or a message key string for an error message
1515          * if invalid. (Scarrrrry ugly interface this.)
1516          * @param Title &$nt the new title
1517          * @param bool $auth indicates whether $wgUser's permissions
1518          *      should be checked
1519          * @return mixed true on success, message name on failure
1520          * @access public
1521          */
1522         function isValidMoveOperation( &$nt, $auth = true ) {
1523                 global $wgUser;
1524                 if( !$this or !$nt ) {
1525                         return 'badtitletext';
1526                 }
1527                 if( $this->equals( $nt ) ) {
1528                         return 'selfmove';
1529                 }
1530                 if( !$this->isMovable() || !$nt->isMovable() ) {
1531                         return 'immobile_namespace';
1532                 }
1533
1534                 $oldid = $this->getArticleID();
1535                 $newid = $nt->getArticleID();
1536
1537                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1538                         return 'articleexists';
1539                 }
1540                 if ( ( '' == $this->getDBkey() ) ||
1541                          ( !$oldid ) ||
1542                      ( '' == $nt->getDBkey() ) ) {
1543                         return 'badarticleerror';
1544                 }
1545
1546                 if ( $auth && (
1547                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1548                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1549                         return 'protectedpage';
1550                 }
1551
1552                 # The move is allowed only if (1) the target doesn't exist, or
1553                 # (2) the target is a redirect to the source, and has no history
1554                 # (so we can undo bad moves right after they're done).
1555
1556                 if ( 0 != $newid ) { # Target exists; check for validity
1557                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1558                                 return 'articleexists';
1559                         }
1560                 }
1561                 return true;
1562         }
1563
1564         /**
1565          * Move a title to a new location
1566          * @param Title &$nt the new title
1567          * @param bool $auth indicates whether $wgUser's permissions
1568          *      should be checked
1569          * @return mixed true on success, message name on failure
1570          * @access public
1571          */
1572         function moveTo( &$nt, $auth = true, $reason = '' ) {
1573                 $err = $this->isValidMoveOperation( $nt, $auth );
1574                 if( is_string( $err ) ) {
1575                         return $err;
1576                 }
1577
1578                 $pageid = $this->getArticleID();
1579                 if( $nt->exists() ) {
1580                         $this->moveOverExistingRedirect( $nt, $reason );
1581                         $pageCountChange = 0;
1582                 } else { # Target didn't exist, do normal move.
1583                         $this->moveToNewTitle( $nt, $newid, $reason );
1584                         $pageCountChange = 1;
1585                 }
1586                 $redirid = $this->getArticleID();
1587
1588                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1589                 $dbw =& wfGetDB( DB_MASTER );
1590                 $categorylinks = $dbw->tableName( 'categorylinks' );
1591                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1592                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1593                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1594                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1595
1596                 # Update watchlists
1597
1598                 $oldnamespace = $this->getNamespace() & ~1;
1599                 $newnamespace = $nt->getNamespace() & ~1;
1600                 $oldtitle = $this->getDBkey();
1601                 $newtitle = $nt->getDBkey();
1602
1603                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1604                         WatchedItem::duplicateEntries( $this, $nt );
1605                 }
1606
1607                 # Update search engine
1608                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1609                 $u->doUpdate();
1610                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1611                 $u->doUpdate();
1612
1613                 # Update site_stats
1614                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1615                         # Moved out of main namespace
1616                         # not viewed, edited, removing
1617                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1618                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1619                         # Moved into main namespace
1620                         # not viewed, edited, adding
1621                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1622                 } elseif ( $pageCountChange ) {
1623                         # Added redirect
1624                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1625                 } else{
1626                         $u = false;
1627                 }
1628                 if ( $u ) {
1629                         $u->doUpdate();
1630                 }
1631
1632                 global $wgUser;
1633                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1634                 return true;
1635         }
1636
1637         /**
1638          * Move page to a title which is at present a redirect to the
1639          * source page
1640          *
1641          * @param Title &$nt the page to move to, which should currently
1642          *      be a redirect
1643          * @access private
1644          */
1645         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1646                 global $wgUser, $wgUseSquid, $wgMwRedir;
1647                 $fname = 'Title::moveOverExistingRedirect';
1648                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1649
1650                 if ( $reason ) {
1651                         $comment .= ": $reason";
1652                 }
1653
1654                 $now = wfTimestampNow();
1655                 $rand = wfRandom();
1656                 $newid = $nt->getArticleID();
1657                 $oldid = $this->getArticleID();
1658                 $dbw =& wfGetDB( DB_MASTER );
1659                 $linkCache =& LinkCache::singleton();
1660
1661                 # Delete the old redirect. We don't save it to history since
1662                 # by definition if we've got here it's rather uninteresting.
1663                 # We have to remove it so that the next step doesn't trigger
1664                 # a conflict on the unique namespace+title index...
1665                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1666
1667                 # Save a null revision in the page's history notifying of the move
1668                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1669                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1670                         true );
1671                 $nullRevId = $nullRevision->insertOn( $dbw );
1672
1673                 # Change the name of the target page:
1674                 $dbw->update( 'page',
1675                         /* SET */ array(
1676                                 'page_touched'   => $dbw->timestamp($now),
1677                                 'page_namespace' => $nt->getNamespace(),
1678                                 'page_title'     => $nt->getDBkey(),
1679                                 'page_latest'    => $nullRevId,
1680                         ),
1681                         /* WHERE */ array( 'page_id' => $oldid ),
1682                         $fname
1683                 );
1684                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1685
1686                 # Recreate the redirect, this time in the other direction.
1687                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1688                 $redirectArticle = new Article( $this );
1689                 $newid = $redirectArticle->insertOn( $dbw );
1690                 $redirectRevision = new Revision( array(
1691                         'page'    => $newid,
1692                         'comment' => $comment,
1693                         'text'    => $redirectText ) );
1694                 $revid = $redirectRevision->insertOn( $dbw );
1695                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1696                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1697
1698                 # Log the move
1699                 $log = new LogPage( 'move' );
1700                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1701
1702                 # Now, we record the link from the redirect to the new title.
1703                 # It should have no other outgoing links...
1704                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1705                 $dbw->insert( 'pagelinks',
1706                         array(
1707                                 'pl_from'      => $newid,
1708                                 'pl_namespace' => $nt->getNamespace(),
1709                                 'pl_title'     => $nt->getDbKey() ),
1710                         $fname );
1711
1712                 # Purge squid
1713                 if ( $wgUseSquid ) {
1714                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1715                         $u = new SquidUpdate( $urls );
1716                         $u->doUpdate();
1717                 }
1718         }
1719
1720         /**
1721          * Move page to non-existing title.
1722          * @param Title &$nt the new Title
1723          * @param int &$newid set to be the new article ID
1724          * @access private
1725          */
1726         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1727                 global $wgUser, $wgUseSquid;
1728                 global $wgMwRedir;
1729                 $fname = 'MovePageForm::moveToNewTitle';
1730                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1731                 if ( $reason ) {
1732                         $comment .= ": $reason";
1733                 }
1734
1735                 $newid = $nt->getArticleID();
1736                 $oldid = $this->getArticleID();
1737                 $dbw =& wfGetDB( DB_MASTER );
1738                 $now = $dbw->timestamp();
1739                 $rand = wfRandom();
1740                 $linkCache =& LinkCache::singleton();
1741
1742                 # Save a null revision in the page's history notifying of the move
1743                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1744                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1745                         true );
1746                 $nullRevId = $nullRevision->insertOn( $dbw );
1747
1748                 # Rename cur entry
1749                 $dbw->update( 'page',
1750                         /* SET */ array(
1751                                 'page_touched'   => $now,
1752                                 'page_namespace' => $nt->getNamespace(),
1753                                 'page_title'     => $nt->getDBkey(),
1754                                 'page_latest'    => $nullRevId,
1755                         ),
1756                         /* WHERE */ array( 'page_id' => $oldid ),
1757                         $fname
1758                 );
1759
1760                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1761
1762                 # Insert redirect
1763                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1764                 $redirectArticle = new Article( $this );
1765                 $newid = $redirectArticle->insertOn( $dbw );
1766                 $redirectRevision = new Revision( array(
1767                         'page'    => $newid,
1768                         'comment' => $comment,
1769                         'text'    => $redirectText ) );
1770                 $revid = $redirectRevision->insertOn( $dbw );
1771                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1772                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1773
1774                 # Log the move
1775                 $log = new LogPage( 'move' );
1776                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1777
1778                 # Purge caches as per article creation
1779                 Article::onArticleCreate( $nt );
1780
1781                 # Record the just-created redirect's linking to the page
1782                 $dbw->insert( 'pagelinks',
1783                         array(
1784                                 'pl_from'      => $newid,
1785                                 'pl_namespace' => $nt->getNamespace(),
1786                                 'pl_title'     => $nt->getDBkey() ),
1787                         $fname );
1788
1789                 # Non-existent target may have had broken links to it; these must
1790                 # now be touched to update link coloring.
1791                 $nt->touchLinks();
1792
1793                 # Purge old title from squid
1794                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1795                 $titles = $nt->getLinksTo();
1796                 if ( $wgUseSquid ) {
1797                         $urls = $this->getSquidURLs();
1798                         foreach ( $titles as $linkTitle ) {
1799                                 $urls[] = $linkTitle->getInternalURL();
1800                         }
1801                         $u = new SquidUpdate( $urls );
1802                         $u->doUpdate();
1803                 }
1804         }
1805
1806         /**
1807          * Checks if $this can be moved to a given Title
1808          * - Selects for update, so don't call it unless you mean business
1809          *
1810          * @param Title &$nt the new title to check
1811          * @access public
1812          */
1813         function isValidMoveTarget( $nt ) {
1814
1815                 $fname = 'Title::isValidMoveTarget';
1816                 $dbw =& wfGetDB( DB_MASTER );
1817
1818                 # Is it a redirect?
1819                 $id  = $nt->getArticleID();
1820                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1821                         array( 'page_is_redirect','old_text','old_flags' ),
1822                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1823                         $fname, 'FOR UPDATE' );
1824
1825                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1826                         # Not a redirect
1827                         return false;
1828                 }
1829                 $text = Revision::getRevisionText( $obj );
1830
1831                 # Does the redirect point to the source?
1832                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1833                         $redirTitle = Title::newFromText( $m[1] );
1834                         if( !is_object( $redirTitle ) ||
1835                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1836                                 return false;
1837                         }
1838                 } else {
1839                         # Fail safe
1840                         return false;
1841                 }
1842
1843                 # Does the article have a history?
1844                 $row = $dbw->selectRow( array( 'page', 'revision'),
1845                         array( 'rev_id' ),
1846                         array( 'page_namespace' => $nt->getNamespace(),
1847                                 'page_title' => $nt->getDBkey(),
1848                                 'page_id=rev_page AND page_latest != rev_id'
1849                         ), $fname, 'FOR UPDATE'
1850                 );
1851
1852                 # Return true if there was no history
1853                 return $row === false;
1854         }
1855
1856         /**
1857          * Create a redirect; fails if the title already exists; does
1858          * not notify RC
1859          *
1860          * @param Title $dest the destination of the redirect
1861          * @param string $comment the comment string describing the move
1862          * @return bool true on success
1863          * @access public
1864          */
1865         function createRedirect( $dest, $comment ) {
1866                 global $wgUser;
1867                 if ( $this->getArticleID() ) {
1868                         return false;
1869                 }
1870
1871                 $fname = 'Title::createRedirect';
1872                 $dbw =& wfGetDB( DB_MASTER );
1873
1874                 $article = new Article( $this );
1875                 $newid = $article->insertOn( $dbw );
1876                 $revision = new Revision( array(
1877                         'page'      => $newid,
1878                         'comment'   => $comment,
1879                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1880                         ) );
1881                 $revisionId = $revision->insertOn( $dbw );
1882                 $article->updateRevisionOn( $dbw, $revision, 0 );
1883
1884                 # Link table
1885                 $dbw->insert( 'pagelinks',
1886                         array(
1887                                 'pl_from'      => $newid,
1888                                 'pl_namespace' => $dest->getNamespace(),
1889                                 'pl_title'     => $dest->getDbKey()
1890                         ), $fname
1891                 );
1892
1893                 Article::onArticleCreate( $this );
1894                 return true;
1895         }
1896
1897         /**
1898          * Get categories to which this Title belongs and return an array of
1899          * categories' names.
1900          *
1901          * @return array an array of parents in the form:
1902          *      $parent => $currentarticle
1903          * @access public
1904          */
1905         function getParentCategories() {
1906                 global $wgContLang,$wgUser;
1907
1908                 $titlekey = $this->getArticleId();
1909                 $dbr =& wfGetDB( DB_SLAVE );
1910                 $categorylinks = $dbr->tableName( 'categorylinks' );
1911
1912                 # NEW SQL
1913                 $sql = "SELECT * FROM $categorylinks"
1914                      ." WHERE cl_from='$titlekey'"
1915                          ." AND cl_from <> '0'"
1916                          ." ORDER BY cl_sortkey";
1917
1918                 $res = $dbr->query ( $sql ) ;
1919
1920                 if($dbr->numRows($res) > 0) {
1921                         while ( $x = $dbr->fetchObject ( $res ) )
1922                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1923                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1924                         $dbr->freeResult ( $res ) ;
1925                 } else {
1926                         $data = '';
1927                 }
1928                 return $data;
1929         }
1930
1931         /**
1932          * Get a tree of parent categories
1933          * @param array $children an array with the children in the keys, to check for circular refs
1934          * @return array
1935          * @access public
1936          */
1937         function getParentCategoryTree( $children = array() ) {
1938                 $parents = $this->getParentCategories();
1939
1940                 if($parents != '') {
1941                         foreach($parents as $parent => $current) {
1942                                 if ( array_key_exists( $parent, $children ) ) {
1943                                         # Circular reference
1944                                         $stack[$parent] = array();
1945                                 } else {
1946                                         $nt = Title::newFromText($parent);
1947                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1948                                 }
1949                         }
1950                         return $stack;
1951                 } else {
1952                         return array();
1953                 }
1954         }
1955
1956
1957         /**
1958          * Get an associative array for selecting this title from
1959          * the "cur" table
1960          *
1961          * @return array
1962          * @access public
1963          */
1964         function curCond() {
1965                 wfDebugDieBacktrace( 'curCond called' );
1966                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1967         }
1968
1969         /**
1970          * Get an associative array for selecting this title from the
1971          * "old" table
1972          *
1973          * @return array
1974          * @access public
1975          */
1976         function oldCond() {
1977                 wfDebugDieBacktrace( 'oldCond called' );
1978                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1979         }
1980
1981         /**
1982          * Get the revision ID of the previous revision
1983          *
1984          * @param integer $revision  Revision ID. Get the revision that was before this one.
1985          * @return interger $oldrevision|false
1986          */
1987         function getPreviousRevisionID( $revision ) {
1988                 $dbr =& wfGetDB( DB_SLAVE );
1989                 return $dbr->selectField( 'revision', 'rev_id',
1990                         'rev_page=' . intval( $this->getArticleId() ) .
1991                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
1992         }
1993
1994         /**
1995          * Get the revision ID of the next revision
1996          *
1997          * @param integer $revision  Revision ID. Get the revision that was after this one.
1998          * @return interger $oldrevision|false
1999          */
2000         function getNextRevisionID( $revision ) {
2001                 $dbr =& wfGetDB( DB_SLAVE );
2002                 return $dbr->selectField( 'revision', 'rev_id',
2003                         'rev_page=' . intval( $this->getArticleId() ) .
2004                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2005         }
2006
2007         /**
2008          * Compare with another title.
2009          *
2010          * @param Title $title
2011          * @return bool
2012          */
2013         function equals( $title ) {
2014                 return $this->getInterwiki() == $title->getInterwiki()
2015                         && $this->getNamespace() == $title->getNamespace()
2016                         && $this->getDbkey() == $title->getDbkey();
2017         }
2018
2019         /**
2020          * Check if page exists
2021          * @return bool
2022          */
2023         function exists() {
2024                 return $this->getArticleId() != 0;
2025         }
2026
2027         /**
2028          * Should a link should be displayed as a known link, just based on its title?
2029          *
2030          * Currently, a self-link with a fragment and special pages are in
2031          * this category. Special pages never exist in the database.
2032          */
2033         function isAlwaysKnown() {
2034                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2035                   || NS_SPECIAL == $this->mNamespace;
2036         }
2037
2038         /**
2039          * Update page_touched timestamps on pages linking to this title.
2040          * In principal, this could be backgrounded and could also do squid
2041          * purging.
2042          */
2043         function touchLinks() {
2044                 $fname = 'Title::touchLinks';
2045
2046                 $dbw =& wfGetDB( DB_MASTER );
2047
2048                 $res = $dbw->select( 'pagelinks',
2049                         array( 'pl_from' ),
2050                         array(
2051                                 'pl_namespace' => $this->getNamespace(),
2052                                 'pl_title'     => $this->getDbKey() ),
2053                         $fname );
2054
2055                 $toucharr = array();
2056                 while( $row = $dbw->fetchObject( $res ) ) {
2057                         $toucharr[] = $row->pl_from;
2058                 }
2059                 $dbw->freeResult( $res );
2060
2061                 if( $this->getNamespace() == NS_CATEGORY ) {
2062                         // Categories show up in a separate set of links as well
2063                         $res = $dbw->select( 'categorylinks',
2064                                 array( 'cl_from' ),
2065                                 array( 'cl_to' => $this->getDbKey() ),
2066                                 $fname );
2067                         while( $row = $dbw->fetchObject( $res ) ) {
2068                                 $toucharr[] = $row->cl_from;
2069                         }
2070                         $dbw->freeResult( $res );
2071                 }
2072
2073                 if (!count($toucharr))
2074                         return;
2075                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2076                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2077         }
2078
2079         function trackbackURL() {
2080                 global $wgTitle, $wgScriptPath, $wgServer;
2081
2082                 return "$wgServer$wgScriptPath/trackback.php?article="
2083                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2084         }
2085
2086         function trackbackRDF() {
2087                 $url = htmlspecialchars($this->getFullURL());
2088                 $title = htmlspecialchars($this->getText());
2089                 $tburl = $this->trackbackURL();
2090
2091                 return "
2092 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2093          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2094          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2095 <rdf:Description
2096    rdf:about=\"$url\"
2097    dc:identifier=\"$url\"
2098    dc:title=\"$title\"
2099    trackback:ping=\"$tburl\" />
2100 </rdf:RDF>";
2101         }
2102 }
2103 ?>