includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 require_once( 'normal/UtfNormal.php' );
   9
  10 $wgTitleInterwikiCache = array();
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13 # Title::newFromTitle maintains a cache to avoid
  14 # expensive re-normalization of commonly used titles.
  15 # On a batch operation this can become a memory leak
  16 # if not bounded. After hitting this many titles,
  17 # reset the cache.
  18 define( 'MW_TITLECACHE_MAX', 1000 );
  19
  20 /**
  21  * Title class
  22  * - Represents a title, which may contain an interwiki designation or namespace
  23  * - Can fetch various kinds of data from the database, albeit inefficiently.
  24  *
  25  * @package MediaWiki
  26  */
  27 class Title {
  28         /**
  29          * All member variables should be considered private
  30          * Please use the accessor functions
  31          */
  32
  33          /**#@+
  34          * @access private
  35          */
  36
  37         var $mTextform;           # Text form (spaces not underscores) of the main part
  38         var $mUrlform;            # URL-encoded form of the main part
  39         var $mDbkeyform;          # Main part with underscores
  40         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  41         var $mInterwiki;          # Interwiki prefix (or null string)
  42         var $mFragment;           # Title fragment (i.e. the bit after the #)
  43         var $mArticleID;          # Article ID, fetched from the link cache on demand
  44         var $mLatestID;         # ID of most recent revision
  45         var $mRestrictions;       # Array of groups allowed to edit this article
  46                               # Only null or "sysop" are supported
  47         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  48         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  49         var $mDefaultNamespace;   # Namespace index when there is no namespace
  50                               # Zero except in {{transclusion}} tags
  51         var $mWatched;            # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  52         /**#@-*/
  53
  54
  55         /**
  56          * Constructor
  57          * @access private
  58          */
  59         /* private */ function Title() {
  60                 $this->mInterwiki = $this->mUrlform =
  61                 $this->mTextform = $this->mDbkeyform = '';
  62                 $this->mArticleID = -1;
  63                 $this->mNamespace = NS_MAIN;
  64                 $this->mRestrictionsLoaded = false;
  65                 $this->mRestrictions = array();
  66                 # Dont change the following, NS_MAIN is hardcoded in several place
  67                 # See bug #696
  68                 $this->mDefaultNamespace = NS_MAIN;
  69                 $this->mWatched = NULL;
  70                 $this->mLatestID = false;
  71         }
  72
  73         /**
  74          * Create a new Title from a prefixed DB key
  75          * @param string $key The database key, which has underscores
  76          *      instead of spaces, possibly including namespace and
  77          *      interwiki prefixes
  78          * @return Title the new object, or NULL on an error
  79          * @static
  80          * @access public
  81          */
  82         /* static */ function newFromDBkey( $key ) {
  83                 $t = new Title();
  84                 $t->mDbkeyform = $key;
  85                 if( $t->secureAndSplit() )
  86                         return $t;
  87                 else
  88                         return NULL;
  89         }
  90
  91         /**
  92          * Create a new Title from text, such as what one would
  93          * find in a link. Decodes any HTML entities in the text.
  94          *
  95          * @param string $text the link text; spaces, prefixes,
  96          *      and an initial ':' indicating the main namespace
  97          *      are accepted
  98          * @param int $defaultNamespace the namespace to use if
  99          *      none is specified by a prefix
 100          * @return Title the new object, or NULL on an error
 101          * @static
 102          * @access public
 103          */
 104         function &newFromText( $text, $defaultNamespace = NS_MAIN ) {
 105                 $fname = 'Title::newFromText';
 106                 wfProfileIn( $fname );
 107
 108                 if( is_object( $text ) ) {
 109                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 110                 }
 111
 112                 /**
 113                  * Wiki pages often contain multiple links to the same page.
 114                  * Title normalization and parsing can become expensive on
 115                  * pages with many links, so we can save a little time by
 116                  * caching them.
 117                  *
 118                  * In theory these are value objects and won't get changed...
 119                  */
 120                 static $titleCache = array();
 121                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 122                         wfProfileOut( $fname );
 123                         return $titleCache[$text];
 124                 }
 125
 126                 /**
 127                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 128                  */
 129                 $filteredText = Sanitizer::decodeCharReferences( $text );
 130
 131                 $t =& new Title();
 132                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 133                 $t->mDefaultNamespace = $defaultNamespace;
 134
 135                 if( $t->secureAndSplit() ) {
 136                         if( $defaultNamespace == NS_MAIN ) {
 137                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 138                                         # Avoid memory leaks on mass operations...
 139                                         $titleCache = array();
 140                                 }
 141                                 $titleCache[$text] =& $t;
 142                         }
 143                         wfProfileOut( $fname );
 144                         return $t;
 145                 } else {
 146                         wfProfileOut( $fname );
 147                         return NULL;
 148                 }
 149         }
 150
 151         /**
 152          * Create a new Title from URL-encoded text. Ensures that
 153          * the given title's length does not exceed the maximum.
 154          * @param string $url the title, as might be taken from a URL
 155          * @return Title the new object, or NULL on an error
 156          * @static
 157          * @access public
 158          */
 159         function newFromURL( $url ) {
 160                 global $wgLang, $wgServer;
 161                 $t = new Title();
 162
 163                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 164                 # but some URLs used it as a space replacement and they still come
 165                 # from some external search tools.
 166                 $s = str_replace( '+', ' ', $url );
 167
 168                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 169                 if( $t->secureAndSplit() ) {
 170                         return $t;
 171                 } else {
 172                         return NULL;
 173                 }
 174         }
 175
 176         /**
 177          * Create a new Title from an article ID
 178          *
 179          * @todo This is inefficiently implemented, the page row is requested
 180          *       but not used for anything else
 181          *
 182          * @param int $id the page_id corresponding to the Title to create
 183          * @return Title the new object, or NULL on an error
 184          * @access public
 185          * @static
 186          */
 187         function newFromID( $id ) {
 188                 $fname = 'Title::newFromID';
 189                 $dbr =& wfGetDB( DB_SLAVE );
 190                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 191                         array( 'page_id' => $id ), $fname );
 192                 if ( $row !== false ) {
 193                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 194                 } else {
 195                         $title = NULL;
 196                 }
 197                 return $title;
 198         }
 199
 200         /**
 201          * Create a new Title from a namespace index and a DB key.
 202          * It's assumed that $ns and $title are *valid*, for instance when
 203          * they came directly from the database or a special page name.
 204          * For convenience, spaces are converted to underscores so that
 205          * eg user_text fields can be used directly.
 206          *
 207          * @param int $ns the namespace of the article
 208          * @param string $title the unprefixed database key form
 209          * @return Title the new object
 210          * @static
 211          * @access public
 212          */
 213         function &makeTitle( $ns, $title ) {
 214                 $t =& new Title();
 215                 $t->mInterwiki = '';
 216                 $t->mFragment = '';
 217                 $t->mNamespace = IntVal( $ns );
 218                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 219                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 220                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 221                 $t->mTextform = str_replace( '_', ' ', $title );
 222                 return $t;
 223         }
 224
 225         /**
 226          * Create a new Title frrom a namespace index and a DB key.
 227          * The parameters will be checked for validity, which is a bit slower
 228          * than makeTitle() but safer for user-provided data.
 229          *
 230          * @param int $ns the namespace of the article
 231          * @param string $title the database key form
 232          * @return Title the new object, or NULL on an error
 233          * @static
 234          * @access public
 235          */
 236         function makeTitleSafe( $ns, $title ) {
 237                 $t = new Title();
 238                 $t->mDbkeyform = Title::makeName( $ns, $title );
 239                 if( $t->secureAndSplit() ) {
 240                         return $t;
 241                 } else {
 242                         return NULL;
 243                 }
 244         }
 245
 246         /**
 247          * Create a new Title for the Main Page
 248          *
 249          * @static
 250          * @return Title the new object
 251          * @access public
 252          */
 253         function newMainPage() {
 254                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 255         }
 256
 257         /**
 258          * Create a new Title for a redirect
 259          * @param string $text the redirect title text
 260          * @return Title the new object, or NULL if the text is not a
 261          *      valid redirect
 262          * @static
 263          * @access public
 264          */
 265         function newFromRedirect( $text ) {
 266                 global $wgMwRedir;
 267                 $rt = NULL;
 268                 if ( $wgMwRedir->matchStart( $text ) ) {
 269                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 270                                 # categories are escaped using : for example one can enter:
 271                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 272                                 if ( substr($m[1],0,1) == ':') {
 273                                         # We don't want to keep the ':'
 274                                         $m[1] = substr( $m[1], 1 );
 275                                 }
 276
 277                                 $rt = Title::newFromText( $m[1] );
 278                                 # Disallow redirects to Special:Userlogout
 279                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 280                                         $rt = NULL;
 281                                 }
 282                         }
 283                 }
 284                 return $rt;
 285         }
 286
 287 #----------------------------------------------------------------------------
 288 #       Static functions
 289 #----------------------------------------------------------------------------
 290
 291         /**
 292          * Get the prefixed DB key associated with an ID
 293          * @param int $id the page_id of the article
 294          * @return Title an object representing the article, or NULL
 295          *      if no such article was found
 296          * @static
 297          * @access public
 298          */
 299         function nameOf( $id ) {
 300                 $fname = 'Title::nameOf';
 301                 $dbr =& wfGetDB( DB_SLAVE );
 302
 303                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 304                 if ( $s === false ) { return NULL; }
 305
 306                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 307                 return $n;
 308         }
 309
 310         /**
 311          * Get a regex character class describing the legal characters in a link
 312          * @return string the list of characters, not delimited
 313          * @static
 314          * @access public
 315          */
 316         /* static */ function legalChars() {
 317                 # Missing characters:
 318                 #  * []|# Needed for link syntax
 319                 #  * % and + are corrupted by Apache when they appear in the path
 320                 #
 321                 # % seems to work though
 322                 #
 323                 # The problem with % is that URLs are double-unescaped: once by Apache's
 324                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 325                 # Our code does not double-escape to compensate for this, indeed double escaping
 326                 # would break if the double-escaped title was passed in the query string
 327                 # rather than the path. This is a minor security issue because articles can be
 328                 # created such that they are hard to view or edit. -- TS
 329                 #
 330                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 331                 # this breaks interlanguage links
 332
 333                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 334                 return $set;
 335         }
 336
 337         /**
 338          * Get a string representation of a title suitable for
 339          * including in a search index
 340          *
 341          * @param int $ns a namespace index
 342          * @param string $title text-form main part
 343          * @return string a stripped-down title string ready for the
 344          *      search index
 345          */
 346         /* static */ function indexTitle( $ns, $title ) {
 347                 global $wgDBminWordLen, $wgContLang;
 348                 require_once( 'SearchEngine.php' );
 349
 350                 $lc = SearchEngine::legalSearchChars() . '&#;';
 351                 $t = $wgContLang->stripForSearch( $title );
 352                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 353                 $t = strtolower( $t );
 354
 355                 # Handle 's, s'
 356                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 357                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 358
 359                 $t = preg_replace( "/\\s+/", ' ', $t );
 360
 361                 if ( $ns == NS_IMAGE ) {
 362                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 363                 }
 364                 return trim( $t );
 365         }
 366
 367         /*
 368          * Make a prefixed DB key from a DB key and a namespace index
 369          * @param int $ns numerical representation of the namespace
 370          * @param string $title the DB key form the title
 371          * @return string the prefixed form of the title
 372          */
 373         /* static */ function makeName( $ns, $title ) {
 374                 global $wgContLang;
 375
 376                 $n = $wgContLang->getNsText( $ns );
 377                 return $n == '' ? $title : "$n:$title";
 378         }
 379
 380         /**
 381          * Returns the URL associated with an interwiki prefix
 382          * @param string $key the interwiki prefix (e.g. "MeatBall")
 383          * @return the associated URL, containing "$1", which should be
 384          *      replaced by an article title
 385          * @static (arguably)
 386          * @access public
 387          */
 388         function getInterwikiLink( $key ) {
 389                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 390                 $fname = 'Title::getInterwikiLink';
 391
 392                 wfProfileIn( $fname );
 393
 394                 $k = $wgDBname.':interwiki:'.$key;
 395                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 396                         wfProfileOut( $fname );
 397                         return $wgTitleInterwikiCache[$k]->iw_url;
 398                 }
 399
 400                 $s = $wgMemc->get( $k );
 401                 # Ignore old keys with no iw_local
 402                 if( $s && isset( $s->iw_local ) ) {
 403                         $wgTitleInterwikiCache[$k] = $s;
 404                         wfProfileOut( $fname );
 405                         return $s->iw_url;
 406                 }
 407
 408                 $dbr =& wfGetDB( DB_SLAVE );
 409                 $res = $dbr->select( 'interwiki',
 410                         array( 'iw_url', 'iw_local' ),
 411                         array( 'iw_prefix' => $key ), $fname );
 412                 if( !$res ) {
 413                         wfProfileOut( $fname );
 414                         return '';
 415                 }
 416
 417                 $s = $dbr->fetchObject( $res );
 418                 if( !$s ) {
 419                         # Cache non-existence: create a blank object and save it to memcached
 420                         $s = (object)false;
 421                         $s->iw_url = '';
 422                         $s->iw_local = 0;
 423                 }
 424                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 425                 $wgTitleInterwikiCache[$k] = $s;
 426
 427                 wfProfileOut( $fname );
 428                 return $s->iw_url;
 429         }
 430
 431         /**
 432          * Determine whether the object refers to a page within
 433          * this project.
 434          *
 435          * @return bool TRUE if this is an in-project interwiki link
 436          *      or a wikilink, FALSE otherwise
 437          * @access public
 438          */
 439         function isLocal() {
 440                 global $wgTitleInterwikiCache, $wgDBname;
 441
 442                 if ( $this->mInterwiki != '' ) {
 443                         # Make sure key is loaded into cache
 444                         $this->getInterwikiLink( $this->mInterwiki );
 445                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 446                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 447                 } else {
 448                         return true;
 449                 }
 450         }
 451
 452         /**
 453          * Update the page_touched field for an array of title objects
 454          * @todo Inefficient unless the IDs are already loaded into the
 455          *      link cache
 456          * @param array $titles an array of Title objects to be touched
 457          * @param string $timestamp the timestamp to use instead of the
 458          *      default current time
 459          * @static
 460          * @access public
 461          */
 462         function touchArray( $titles, $timestamp = '' ) {
 463                 if ( count( $titles ) == 0 ) {
 464                         return;
 465                 }
 466                 $dbw =& wfGetDB( DB_MASTER );
 467                 if ( $timestamp == '' ) {
 468                         $timestamp = $dbw->timestamp();
 469                 }
 470                 $page = $dbw->tableName( 'page' );
 471                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 472                 $first = true;
 473
 474                 foreach ( $titles as $title ) {
 475                         if ( ! $first ) {
 476                                 $sql .= ',';
 477                         }
 478                         $first = false;
 479                         $sql .= $title->getArticleID();
 480                 }
 481                 $sql .= ')';
 482                 if ( ! $first ) {
 483                         $dbw->query( $sql, 'Title::touchArray' );
 484                 }
 485         }
 486
 487 #----------------------------------------------------------------------------
 488 #       Other stuff
 489 #----------------------------------------------------------------------------
 490
 491         /** Simple accessors */
 492         /**
 493          * Get the text form (spaces not underscores) of the main part
 494          * @return string
 495          * @access public
 496          */
 497         function getText() { return $this->mTextform; }
 498         /**
 499          * Get the URL-encoded form of the main part
 500          * @return string
 501          * @access public
 502          */
 503         function getPartialURL() { return $this->mUrlform; }
 504         /**
 505          * Get the main part with underscores
 506          * @return string
 507          * @access public
 508          */
 509         function getDBkey() { return $this->mDbkeyform; }
 510         /**
 511          * Get the namespace index, i.e. one of the NS_xxxx constants
 512          * @return int
 513          * @access public
 514          */
 515         function getNamespace() { return $this->mNamespace; }
 516         /**
 517          * Get the interwiki prefix (or null string)
 518          * @return string
 519          * @access public
 520          */
 521         function getInterwiki() { return $this->mInterwiki; }
 522         /**
 523          * Get the Title fragment (i.e. the bit after the #)
 524          * @return string
 525          * @access public
 526          */
 527         function getFragment() { return $this->mFragment; }
 528         /**
 529          * Get the default namespace index, for when there is no namespace
 530          * @return int
 531          * @access public
 532          */
 533         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 534
 535         /**
 536          * Get title for search index
 537          * @return string a stripped-down title string ready for the
 538          *      search index
 539          */
 540         function getIndexTitle() {
 541                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 542         }
 543
 544         /**
 545          * Get the prefixed database key form
 546          * @return string the prefixed title, with underscores and
 547          *      any interwiki and namespace prefixes
 548          * @access public
 549          */
 550         function getPrefixedDBkey() {
 551                 $s = $this->prefix( $this->mDbkeyform );
 552                 $s = str_replace( ' ', '_', $s );
 553                 return $s;
 554         }
 555
 556         /**
 557          * Get the prefixed title with spaces.
 558          * This is the form usually used for display
 559          * @return string the prefixed title, with spaces
 560          * @access public
 561          */
 562         function getPrefixedText() {
 563                 global $wgContLang;
 564                 if ( empty( $this->mPrefixedText ) ) {
 565                         $s = $this->prefix( $this->mTextform );
 566                         $s = str_replace( '_', ' ', $s );
 567                         $this->mPrefixedText = $s;
 568                 }
 569                 return $this->mPrefixedText;
 570         }
 571
 572         /**
 573          * Get the prefixed title with spaces, plus any fragment
 574          * (part beginning with '#')
 575          * @return string the prefixed title, with spaces and
 576          *      the fragment, including '#'
 577          * @access public
 578          */
 579         function getFullText() {
 580                 global $wgContLang;
 581                 $text = $this->getPrefixedText();
 582                 if( '' != $this->mFragment ) {
 583                         $text .= '#' . $this->mFragment;
 584                 }
 585                 return $text;
 586         }
 587
 588         /**
 589          * Get a URL-encoded title (not an actual URL) including interwiki
 590          * @return string the URL-encoded form
 591          * @access public
 592          */
 593         function getPrefixedURL() {
 594                 $s = $this->prefix( $this->mDbkeyform );
 595                 $s = str_replace( ' ', '_', $s );
 596
 597                 $s = wfUrlencode ( $s ) ;
 598
 599                 # Cleaning up URL to make it look nice -- is this safe?
 600                 $s = str_replace( '%28', '(', $s );
 601                 $s = str_replace( '%29', ')', $s );
 602
 603                 return $s;
 604         }
 605
 606         /**
 607          * Get a real URL referring to this title, with interwiki link and
 608          * fragment
 609          *
 610          * @param string $query an optional query string, not used
 611          *      for interwiki links
 612          * @return string the URL
 613          * @access public
 614          */
 615         function getFullURL( $query = '' ) {
 616                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 617
 618                 if ( '' == $this->mInterwiki ) {
 619                         return $wgServer . $this->getLocalUrl( $query );
 620                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 621                         $baseUrl = str_replace( '$1', "../../{$this->mInterwiki}/$1", $wgArticlePath );
 622                         $baseUrl = str_replace( '$1', $this->getHashedDirectory() . '/$1', $baseUrl );
 623                 } else {
 624                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 625                 }
 626
 627                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 628                 if ( '' != $namespace ) {
 629                         # Can this actually happen? Interwikis shouldn't be parsed.
 630                         $namepace .= ':';
 631                 }
 632                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 633                 if( $query != '' ) {
 634                         if( false === strpos( $url, '?' ) ) {
 635                                 $url .= '?';
 636                         } else {
 637                                 $url .= '&';
 638                         }
 639                         $url .= $query;
 640                 }
 641                 if ( '' != $this->mFragment ) {
 642                         $url .= '#' . $this->mFragment;
 643                 }
 644                 return $url;
 645         }
 646
 647         /**
 648          * Get a relative directory for putting an HTML version of this article into
 649          */
 650         function getHashedDirectory() {
 651                 global $wgMakeDumpLinks, $wgInputEncoding;
 652                 $dbkey = $this->getDBkey();
 653
 654                 # Split into characters
 655                 if ( $wgInputEncoding == 'UTF-8' ) {
 656                         preg_match_all( '/./us', $dbkey, $m );
 657                 } else {
 658                         preg_match_all( '/./s', $dbkey, $m );
 659                 }
 660                 $chars = $m[0];
 661                 $length = count( $chars );
 662                 $dir = '';
 663
 664                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 665                         if ( $i ) {
 666                                 $dir .= '/';
 667                         }
 668                         if ( $i >= $length ) {
 669                                 $dir .= '_';
 670                         } elseif ( ord( $chars[$i] ) > 32 ) {
 671                                 $dir .= strtolower( $chars[$i] );
 672                         } else {
 673                                 $dir .= sprintf( "%02X", ord( $chars[$i] ) );
 674                         }
 675                 }
 676                 return $dir;
 677         }
 678
 679         function getHashedFilename() {
 680                 $dbkey = $this->getPrefixedDBkey();
 681                 $mainPage = Title::newMainPage();
 682                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 683                         return 'index.html';
 684                 }
 685
 686                 $dir = $this->getHashedDirectory();
 687
 688                 # Replace illegal charcters for Windows paths with underscores
 689                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 690
 691                 # Work out lower case form. We assume we're on a system with case-insensitive
 692                 # filenames, so unless the case is of a special form, we have to disambiguate
 693                 $lowerCase = $this->prefix( ucfirst( strtolower( $this->getDBkey() ) ) );
 694
 695                 # Make it mostly unique
 696                 if ( $lowerCase != $friendlyName  ) {
 697                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 698                 }
 699                 # Handle colon specially by replacing it with tilde
 700                 # Thus we reduce the number of paths with hashes appended
 701                 $friendlyName = str_replace( ':', '~', $friendlyName );
 702                 return "$dir/$friendlyName.html";
 703         }
 704
 705         /**
 706          * Get a URL with no fragment or server name
 707          * @param string $query an optional query string; if not specified,
 708          *      $wgArticlePath will be used.
 709          * @return string the URL
 710          * @access public
 711          */
 712         function getLocalURL( $query = '' ) {
 713                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks;
 714
 715                 if ( $this->isExternal() ) {
 716                         return $this->getFullURL();
 717                 }
 718
 719                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 720                 if ( $wgMakeDumpLinks ) {
 721                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 722                 } elseif ( $query == '' ) {
 723                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 724                 } else {
 725                         global $wgActionPaths;
 726                         if( !empty( $wgActionPaths ) &&
 727                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 728                                 $action = urldecode( $matches[2] );
 729                                 if( isset( $wgActionPaths[$action] ) ) {
 730                                         $query = $matches[1];
 731                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 732                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 733                                         if( $query != '' ) $url .= '?' . $query;
 734                                         return $url;
 735                                 }
 736                         }
 737                         if ( $query == '-' ) {
 738                                 $query = '';
 739                         }
 740                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 741                 }
 742                 return $url;
 743         }
 744
 745         /**
 746          * Get an HTML-escaped version of the URL form, suitable for
 747          * using in a link, without a server name or fragment
 748          * @param string $query an optional query string
 749          * @return string the URL
 750          * @access public
 751          */
 752         function escapeLocalURL( $query = '' ) {
 753                 return htmlspecialchars( $this->getLocalURL( $query ) );
 754         }
 755
 756         /**
 757          * Get an HTML-escaped version of the URL form, suitable for
 758          * using in a link, including the server name and fragment
 759          *
 760          * @return string the URL
 761          * @param string $query an optional query string
 762          * @access public
 763          */
 764         function escapeFullURL( $query = '' ) {
 765                 return htmlspecialchars( $this->getFullURL( $query ) );
 766         }
 767
 768         /**
 769          * Get the URL form for an internal link.
 770          * - Used in various Squid-related code, in case we have a different
 771          * internal hostname for the server from the exposed one.
 772          *
 773          * @param string $query an optional query string
 774          * @return string the URL
 775          * @access public
 776          */
 777         function getInternalURL( $query = '' ) {
 778                 global $wgInternalServer;
 779                 return $wgInternalServer . $this->getLocalURL( $query );
 780         }
 781
 782         /**
 783          * Get the edit URL for this Title
 784          * @return string the URL, or a null string if this is an
 785          *      interwiki link
 786          * @access public
 787          */
 788         function getEditURL() {
 789                 global $wgServer, $wgScript;
 790
 791                 if ( '' != $this->mInterwiki ) { return ''; }
 792                 $s = $this->getLocalURL( 'action=edit' );
 793
 794                 return $s;
 795         }
 796
 797         /**
 798          * Get the HTML-escaped displayable text form.
 799          * Used for the title field in <a> tags.
 800          * @return string the text, including any prefixes
 801          * @access public
 802          */
 803         function getEscapedText() {
 804                 return htmlspecialchars( $this->getPrefixedText() );
 805         }
 806
 807         /**
 808          * Is this Title interwiki?
 809          * @return boolean
 810          * @access public
 811          */
 812         function isExternal() { return ( '' != $this->mInterwiki ); }
 813
 814         /**
 815          * Does the title correspond to a protected article?
 816          * @param string $what the action the page is protected from,
 817          *      by default checks move and edit
 818          * @return boolean
 819          * @access public
 820          */
 821         function isProtected($action = '') {
 822                 if ( -1 == $this->mNamespace ) { return true; }
 823                 if($action == 'edit' || $action == '') {
 824                         $a = $this->getRestrictions("edit");
 825                         if ( in_array( 'sysop', $a ) ) { return true; }
 826                 }
 827                 if($action == 'move' || $action == '') {
 828                         $a = $this->getRestrictions("move");
 829                         if ( in_array( 'sysop', $a ) ) { return true; }
 830                 }
 831                 return false;
 832         }
 833
 834         /**
 835          * Is $wgUser is watching this page?
 836          * @return boolean
 837          * @access public
 838          */
 839         function userIsWatching() {
 840                 global $wgUser;
 841
 842                 if ( is_null( $this->mWatched ) ) {
 843                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 844                                 $this->mWatched = false;
 845                         } else {
 846                                 $this->mWatched = $wgUser->isWatched( $this );
 847                         }
 848                 }
 849                 return $this->mWatched;
 850         }
 851
 852         /**
 853          * Is $wgUser perform $action this page?
 854          * @param string $action action that permission needs to be checked for
 855          * @return boolean
 856          * @access private
 857          */
 858         function userCan($action) {
 859                 $fname = 'Title::userCanEdit';
 860                 wfProfileIn( $fname );
 861
 862                 global $wgUser;
 863                 if( NS_SPECIAL == $this->mNamespace ) {
 864                         wfProfileOut( $fname );
 865                         return false;
 866                 }
 867                 if( NS_MEDIAWIKI == $this->mNamespace &&
 868                     !$wgUser->isAllowed('editinterface') ) {
 869                         wfProfileOut( $fname );
 870                         return false;
 871                 }
 872                 if( $this->mDbkeyform == '_' ) {
 873                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 874                         wfProfileOut( $fname );
 875                         return false;
 876                 }
 877
 878                 # protect global styles and js
 879                 if ( NS_MEDIAWIKI == $this->mNamespace
 880                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 881                      && !$wgUser->isAllowed('editinterface') ) {
 882                         wfProfileOut( $fname );
 883                         return false;
 884                 }
 885
 886                 # protect css/js subpages of user pages
 887                 # XXX: this might be better using restrictions
 888                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 889                 if( NS_USER == $this->mNamespace
 890                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 891                         && !$wgUser->isAllowed('editinterface')
 892                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 893                         wfProfileOut( $fname );
 894                         return false;
 895                 }
 896
 897                 foreach( $this->getRestrictions($action) as $right ) {
 898                         // Backwards compatibility, rewrite sysop -> protect
 899                         if ( $right == 'sysop' ) {
 900                                 $right = 'protect';
 901                         }
 902                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 903                                 wfProfileOut( $fname );
 904                                 return false;
 905                         }
 906                 }
 907
 908                 if( $action == 'move' && !$this->isMovable() ) {
 909                         wfProfileOut( $fname );
 910                         return false;
 911                 }
 912
 913                 wfProfileOut( $fname );
 914                 return true;
 915         }
 916
 917         /**
 918          * Can $wgUser edit this page?
 919          * @return boolean
 920          * @access public
 921          */
 922         function userCanEdit() {
 923                 return $this->userCan('edit');
 924         }
 925
 926         /**
 927          * Can $wgUser move this page?
 928          * @return boolean
 929          * @access public
 930          */
 931         function userCanMove() {
 932                 return $this->userCan('move');
 933         }
 934
 935         /**
 936          * Would anybody with sufficient privileges be able to move this page?
 937          * Some pages just aren't movable.
 938          *
 939          * @return boolean
 940          * @access public
 941          */
 942         function isMovable() {
 943                 return Namespace::isMovable( $this->getNamespace() )
 944                         && $this->getInterwiki() == '';
 945         }
 946
 947         /**
 948          * Can $wgUser read this page?
 949          * @return boolean
 950          * @access public
 951          */
 952         function userCanRead() {
 953                 global $wgUser;
 954
 955                 if( $wgUser->isAllowed('read') ) {
 956                         return true;
 957                 } else {
 958                         global $wgWhitelistRead;
 959
 960                         /** If anon users can create an account,
 961                             they need to reach the login page first! */
 962                         if( $wgUser->isAllowed( 'createaccount' )
 963                             && $this->getNamespace() == NS_SPECIAL
 964                             && $this->getText() == 'Userlogin' ) {
 965                                 return true;
 966                         }
 967
 968                         /** some pages are explicitly allowed */
 969                         $name = $this->getPrefixedText();
 970                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
 971                                 return true;
 972                         }
 973
 974                         # Compatibility with old settings
 975                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
 976                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 977                                         return true;
 978                                 }
 979                         }
 980                 }
 981                 return false;
 982         }
 983
 984         /**
 985          * Is this a talk page of some sort?
 986          * @return bool
 987          * @access public
 988          */
 989         function isTalkPage() {
 990                 return Namespace::isTalk( $this->getNamespace() );
 991         }
 992
 993         /**
 994          * Is this a .css or .js subpage of a user page?
 995          * @return bool
 996          * @access public
 997          */
 998         function isCssJsSubpage() {
 999                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1000         }
1001         /**
1002          * Is this a .css subpage of a user page?
1003          * @return bool
1004          * @access public
1005          */
1006         function isCssSubpage() {
1007                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1008         }
1009         /**
1010          * Is this a .js subpage of a user page?
1011          * @return bool
1012          * @access public
1013          */
1014         function isJsSubpage() {
1015                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1016         }
1017         /**
1018          * Protect css/js subpages of user pages: can $wgUser edit
1019          * this page?
1020          *
1021          * @return boolean
1022          * @todo XXX: this might be better using restrictions
1023          * @access public
1024          */
1025         function userCanEditCssJsSubpage() {
1026                 global $wgUser;
1027                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1028         }
1029
1030         /**
1031          * Loads a string into mRestrictions array
1032          * @param string $res restrictions in string format
1033          * @access public
1034          */
1035         function loadRestrictions( $res ) {
1036                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1037                         $temp = explode( '=', trim( $restrict ) );
1038                         if(count($temp) == 1) {
1039                                 // old format should be treated as edit/move restriction
1040                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1041                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1042                         } else {
1043                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1044                         }
1045                 }
1046                 $this->mRestrictionsLoaded = true;
1047         }
1048
1049         /**
1050          * Accessor/initialisation for mRestrictions
1051          * @param string $action action that permission needs to be checked for
1052          * @return array the array of groups allowed to edit this article
1053          * @access public
1054          */
1055         function getRestrictions($action) {
1056                 $id = $this->getArticleID();
1057                 if ( 0 == $id ) { return array(); }
1058
1059                 if ( ! $this->mRestrictionsLoaded ) {
1060                         $dbr =& wfGetDB( DB_SLAVE );
1061                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1062                         $this->loadRestrictions( $res );
1063                 }
1064                 if( isset( $this->mRestrictions[$action] ) ) {
1065                         return $this->mRestrictions[$action];
1066                 }
1067                 return array();
1068         }
1069
1070         /**
1071          * Is there a version of this page in the deletion archive?
1072          * @return int the number of archived revisions
1073          * @access public
1074          */
1075         function isDeleted() {
1076                 $fname = 'Title::isDeleted';
1077                 if ( $this->getNamespace() < 0 ) {
1078                         $n = 0;
1079                 } else {
1080                         $dbr =& wfGetDB( DB_SLAVE );
1081                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1082                                 'ar_title' => $this->getDBkey() ), $fname );
1083                 }
1084                 return (int)$n;
1085         }
1086
1087         /**
1088          * Get the article ID for this Title from the link cache,
1089          * adding it if necessary
1090          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1091          *      for update
1092          * @return int the ID
1093          * @access public
1094          */
1095         function getArticleID( $flags = 0 ) {
1096                 global $wgLinkCache;
1097
1098                 if ( $flags & GAID_FOR_UPDATE ) {
1099                         $oldUpdate = $wgLinkCache->forUpdate( true );
1100                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1101                         $wgLinkCache->forUpdate( $oldUpdate );
1102                 } else {
1103                         if ( -1 == $this->mArticleID ) {
1104                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1105                         }
1106                 }
1107                 return $this->mArticleID;
1108         }
1109
1110         function getLatestRevID() {
1111                 if ($this->mLatestID !== false)
1112                         return $this->mLatestID;
1113
1114                 $db =& wfGetDB(DB_SLAVE);
1115                 return $this->mLatestID = $db->selectField( 'revision',
1116                         "max(rev_id)",
1117                         array('rev_page' => $this->getArticleID()),
1118                         'Title::getLatestRevID' );
1119         }
1120
1121         /**
1122          * This clears some fields in this object, and clears any associated
1123          * keys in the "bad links" section of $wgLinkCache.
1124          *
1125          * - This is called from Article::insertNewArticle() to allow
1126          * loading of the new page_id. It's also called from
1127          * Article::doDeleteArticle()
1128          *
1129          * @param int $newid the new Article ID
1130          * @access public
1131          */
1132         function resetArticleID( $newid ) {
1133                 global $wgLinkCache;
1134                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1135
1136                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1137                 else { $this->mArticleID = $newid; }
1138                 $this->mRestrictionsLoaded = false;
1139                 $this->mRestrictions = array();
1140         }
1141
1142         /**
1143          * Updates page_touched for this page; called from LinksUpdate.php
1144          * @return bool true if the update succeded
1145          * @access public
1146          */
1147         function invalidateCache() {
1148                 if ( wfReadOnly() ) {
1149                         return;
1150                 }
1151
1152                 $now = wfTimestampNow();
1153                 $dbw =& wfGetDB( DB_MASTER );
1154                 $success = $dbw->update( 'page',
1155                         array( /* SET */
1156                                 'page_touched' => $dbw->timestamp()
1157                         ), array( /* WHERE */
1158                                 'page_namespace' => $this->getNamespace() ,
1159                                 'page_title' => $this->getDBkey()
1160                         ), 'Title::invalidateCache'
1161                 );
1162                 return $success;
1163         }
1164
1165         /**
1166          * Prefix some arbitrary text with the namespace or interwiki prefix
1167          * of this object
1168          *
1169          * @param string $name the text
1170          * @return string the prefixed text
1171          * @access private
1172          */
1173         /* private */ function prefix( $name ) {
1174                 global $wgContLang;
1175
1176                 $p = '';
1177                 if ( '' != $this->mInterwiki ) {
1178                         $p = $this->mInterwiki . ':';
1179                 }
1180                 if ( 0 != $this->mNamespace ) {
1181                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1182                 }
1183                 return $p . $name;
1184         }
1185
1186         /**
1187          * Secure and split - main initialisation function for this object
1188          *
1189          * Assumes that mDbkeyform has been set, and is urldecoded
1190          * and uses underscores, but not otherwise munged.  This function
1191          * removes illegal characters, splits off the interwiki and
1192          * namespace prefixes, sets the other forms, and canonicalizes
1193          * everything.
1194          * @return bool true on success
1195          * @access private
1196          */
1197         /* private */ function secureAndSplit() {
1198                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1199                 $fname = 'Title::secureAndSplit';
1200                 wfProfileIn( $fname );
1201
1202                 # Initialisation
1203                 static $rxTc = false;
1204                 if( !$rxTc ) {
1205                         # % is needed as well
1206                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1207                 }
1208
1209                 $this->mInterwiki = $this->mFragment = '';
1210                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1211
1212                 # Clean up whitespace
1213                 #
1214                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1215                 $t = trim( $t, '_' );
1216
1217                 if ( '' == $t ) {
1218                         wfProfileOut( $fname );
1219                         return false;
1220                 }
1221
1222                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1223                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1224                         wfProfileOut( $fname );
1225                         return false;
1226                 }
1227
1228                 $this->mDbkeyform = $t;
1229
1230                 # Initial colon indicating main namespace
1231                 if ( ':' == $t{0} ) {
1232                         $r = substr( $t, 1 );
1233                         $this->mNamespace = NS_MAIN;
1234                 } else {
1235                         # Namespace or interwiki prefix
1236                         $firstPass = true;
1237                         do {
1238                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1239                                         $p = $m[1];
1240                                         $lowerNs = strtolower( $p );
1241                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1242                                                 # Canonical namespace
1243                                                 $t = $m[2];
1244                                                 $this->mNamespace = $ns;
1245                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1246                                                 # Ordinary namespace
1247                                                 $t = $m[2];
1248                                                 $this->mNamespace = $ns;
1249                                         } elseif( $this->getInterwikiLink( $p ) ) {
1250                                                 if( !$firstPass ) {
1251                                                         # Can't make a local interwiki link to an interwiki link.
1252                                                         # That's just crazy!
1253                                                         wfProfileOut( $fname );
1254                                                         return false;
1255                                                 }
1256
1257                                                 # Interwiki link
1258                                                 $t = $m[2];
1259                                                 $this->mInterwiki = $p;
1260
1261                                                 # Redundant interwiki prefix to the local wiki
1262                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1263                                                         if( $t == '' ) {
1264                                                                 # Can't have an empty self-link
1265                                                                 wfProfileOut( $fname );
1266                                                                 return false;
1267                                                         }
1268                                                         $this->mInterwiki = '';
1269                                                         $firstPass = false;
1270                                                         # Do another namespace split...
1271                                                         continue;
1272                                                 }
1273                                         }
1274                                         # If there's no recognized interwiki or namespace,
1275                                         # then let the colon expression be part of the title.
1276                                 }
1277                                 break;
1278                         } while( true );
1279                         $r = $t;
1280                 }
1281
1282                 # We already know that some pages won't be in the database!
1283                 #
1284                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1285                         $this->mArticleID = 0;
1286                 }
1287                 $f = strstr( $r, '#' );
1288                 if ( false !== $f ) {
1289                         $this->mFragment = substr( $f, 1 );
1290                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1291                         # remove whitespace again: prevents "Foo_bar_#"
1292                         # becoming "Foo_bar_"
1293                         $r = preg_replace( '/_*$/', '', $r );
1294                 }
1295
1296                 # Reject illegal characters.
1297                 #
1298                 if( preg_match( $rxTc, $r ) ) {
1299                         wfProfileOut( $fname );
1300                         return false;
1301                 }
1302
1303                 /**
1304                  * Pages with "/./" or "/../" appearing in the URLs will
1305                  * often be unreachable due to the way web browsers deal
1306                  * with 'relative' URLs. Forbid them explicitly.
1307                  */
1308                 if ( strpos( $r, '.' ) !== false &&
1309                      ( $r === '.' || $r === '..' ||
1310                        strpos( $r, './' ) === 0  ||
1311                        strpos( $r, '../' ) === 0 ||
1312                        strpos( $r, '/./' ) !== false ||
1313                        strpos( $r, '/../' ) !== false ) )
1314                 {
1315                         wfProfileOut( $fname );
1316                         return false;
1317                 }
1318
1319                 # We shouldn't need to query the DB for the size.
1320                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1321                 if ( strlen( $r ) > 255 ) {
1322                         wfProfileOut( $fname );
1323                         return false;
1324                 }
1325
1326                 /**
1327                  * Normally, all wiki links are forced to have
1328                  * an initial capital letter so [[foo]] and [[Foo]]
1329                  * point to the same place.
1330                  *
1331                  * Don't force it for interwikis, since the other
1332                  * site might be case-sensitive.
1333                  */
1334                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1335                         $t = $wgContLang->ucfirst( $r );
1336                 } else {
1337                         $t = $r;
1338                 }
1339
1340                 /**
1341                  * Can't make a link to a namespace alone...
1342                  * "empty" local links can only be self-links
1343                  * with a fragment identifier.
1344                  */
1345                 if( $t == '' &&
1346                         $this->mInterwiki == '' &&
1347                         $this->mNamespace != NS_MAIN ) {
1348                         wfProfileOut( $fname );
1349                         return false;
1350                 }
1351
1352                 # Fill fields
1353                 $this->mDbkeyform = $t;
1354                 $this->mUrlform = wfUrlencode( $t );
1355
1356                 $this->mTextform = str_replace( '_', ' ', $t );
1357
1358                 wfProfileOut( $fname );
1359                 return true;
1360         }
1361
1362         /**
1363          * Get a Title object associated with the talk page of this article
1364          * @return Title the object for the talk page
1365          * @access public
1366          */
1367         function getTalkPage() {
1368                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1369         }
1370
1371         /**
1372          * Get a title object associated with the subject page of this
1373          * talk page
1374          *
1375          * @return Title the object for the subject page
1376          * @access public
1377          */
1378         function getSubjectPage() {
1379                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1380         }
1381
1382         /**
1383          * Get an array of Title objects linking to this Title
1384          * Also stores the IDs in the link cache.
1385          *
1386          * @param string $options may be FOR UPDATE
1387          * @return array the Title objects linking here
1388          * @access public
1389          */
1390         function getLinksTo( $options = '' ) {
1391                 global $wgLinkCache;
1392                 $id = $this->getArticleID();
1393
1394                 if ( $options ) {
1395                         $db =& wfGetDB( DB_MASTER );
1396                 } else {
1397                         $db =& wfGetDB( DB_SLAVE );
1398                 }
1399
1400                 $res = $db->select( array( 'page', 'pagelinks' ),
1401                         array( 'page_namespace', 'page_title', 'page_id' ),
1402                         array(
1403                                 'pl_from=page_id',
1404                                 'pl_namespace' => $this->getNamespace(),
1405                                 'pl_title'     => $this->getDbKey() ),
1406                         'Title::getLinksTo',
1407                         $options );
1408
1409                 $retVal = array();
1410                 if ( $db->numRows( $res ) ) {
1411                         while ( $row = $db->fetchObject( $res ) ) {
1412                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1413                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1414                                         $retVal[] = $titleObj;
1415                                 }
1416                         }
1417                 }
1418                 $db->freeResult( $res );
1419                 return $retVal;
1420         }
1421
1422         /**
1423          * Get an array of Title objects referring to non-existent articles linked from this page
1424          *
1425          * @param string $options may be FOR UPDATE
1426          * @return array the Title objects
1427          * @access public
1428          */
1429         function getBrokenLinksFrom( $options = '' ) {
1430                 global $wgLinkCache;
1431
1432                 if ( $options ) {
1433                         $db =& wfGetDB( DB_MASTER );
1434                 } else {
1435                         $db =& wfGetDB( DB_SLAVE );
1436                 }
1437
1438                 $res = $db->safeQuery(
1439                           "SELECT pl_namespace, pl_title
1440                              FROM !
1441                         LEFT JOIN !
1442                                ON pl_namespace=page_namespace
1443                               AND pl_title=page_title
1444                             WHERE pl_from=?
1445                               AND page_namespace IS NULL
1446                                   !",
1447                         $db->tableName( 'pagelinks' ),
1448                         $db->tableName( 'page' ),
1449                         $this->getArticleId(),
1450                         $options );
1451
1452                 $retVal = array();
1453                 if ( $db->numRows( $res ) ) {
1454                         while ( $row = $db->fetchObject( $res ) ) {
1455                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1456                         }
1457                 }
1458                 $db->freeResult( $res );
1459                 return $retVal;
1460         }
1461
1462
1463         /**
1464          * Get a list of URLs to purge from the Squid cache when this
1465          * page changes
1466          *
1467          * @return array the URLs
1468          * @access public
1469          */
1470         function getSquidURLs() {
1471                 return array(
1472                         $this->getInternalURL(),
1473                         $this->getInternalURL( 'action=history' )
1474                 );
1475         }
1476
1477         /**
1478          * Move this page without authentication
1479          * @param Title &$nt the new page Title
1480          * @access public
1481          */
1482         function moveNoAuth( &$nt ) {
1483                 return $this->moveTo( $nt, false );
1484         }
1485
1486         /**
1487          * Check whether a given move operation would be valid.
1488          * Returns true if ok, or a message key string for an error message
1489          * if invalid. (Scarrrrry ugly interface this.)
1490          * @param Title &$nt the new title
1491          * @param bool $auth indicates whether $wgUser's permissions
1492          *      should be checked
1493          * @return mixed true on success, message name on failure
1494          * @access public
1495          */
1496         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1497                 global $wgUser;
1498                 if( !$this or !$nt ) {
1499                         return 'badtitletext';
1500                 }
1501                 if( $this->equals( $nt ) ) {
1502                         return 'selfmove';
1503                 }
1504                 if( !$this->isMovable() || !$nt->isMovable() ) {
1505                         return 'immobile_namespace';
1506                 }
1507
1508                 $fname = 'Title::move';
1509                 $oldid = $this->getArticleID();
1510                 $newid = $nt->getArticleID();
1511
1512                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1513                         return 'articleexists';
1514                 }
1515                 if ( ( '' == $this->getDBkey() ) ||
1516                          ( !$oldid ) ||
1517                      ( '' == $nt->getDBkey() ) ) {
1518                         return 'badarticleerror';
1519                 }
1520
1521                 if ( $auth && (
1522                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1523                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1524                         return 'protectedpage';
1525                 }
1526
1527                 # The move is allowed only if (1) the target doesn't exist, or
1528                 # (2) the target is a redirect to the source, and has no history
1529                 # (so we can undo bad moves right after they're done).
1530
1531                 if ( 0 != $newid ) { # Target exists; check for validity
1532                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1533                                 return 'articleexists';
1534                         }
1535                 }
1536                 return true;
1537         }
1538
1539         /**
1540          * Move a title to a new location
1541          * @param Title &$nt the new title
1542          * @param bool $auth indicates whether $wgUser's permissions
1543          *      should be checked
1544          * @return mixed true on success, message name on failure
1545          * @access public
1546          */
1547         function moveTo( &$nt, $auth = true, $reason = '' ) {
1548                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1549                 if( is_string( $err ) ) {
1550                         return $err;
1551                 }
1552
1553                 $pageid = $this->getArticleID();
1554                 if( $nt->exists() ) {
1555                         $this->moveOverExistingRedirect( $nt, $reason );
1556                         $pageCountChange = 0;
1557                 } else { # Target didn't exist, do normal move.
1558                         $this->moveToNewTitle( $nt, $newid, $reason );
1559                         $pageCountChange = 1;
1560                 }
1561                 $redirid = $this->getArticleID();
1562
1563                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1564                 $dbw =& wfGetDB( DB_MASTER );
1565                 $categorylinks = $dbw->tableName( 'categorylinks' );
1566                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1567                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1568                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1569                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1570
1571                 # Update watchlists
1572
1573                 $oldnamespace = $this->getNamespace() & ~1;
1574                 $newnamespace = $nt->getNamespace() & ~1;
1575                 $oldtitle = $this->getDBkey();
1576                 $newtitle = $nt->getDBkey();
1577
1578                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1579                         WatchedItem::duplicateEntries( $this, $nt );
1580                 }
1581
1582                 # Update search engine
1583                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1584                 $u->doUpdate();
1585                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1586                 $u->doUpdate();
1587
1588                 # Update site_stats
1589                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1590                         # Moved out of main namespace
1591                         # not viewed, edited, removing
1592                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1593                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1594                         # Moved into main namespace
1595                         # not viewed, edited, adding
1596                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1597                 } elseif ( $pageCountChange ) {
1598                         # Added redirect
1599                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1600                 } else{
1601                         $u = false;
1602                 }
1603                 if ( $u ) {
1604                         $u->doUpdate();
1605                 }
1606
1607                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1608                 return true;
1609         }
1610
1611         /**
1612          * Move page to a title which is at present a redirect to the
1613          * source page
1614          *
1615          * @param Title &$nt the page to move to, which should currently
1616          *      be a redirect
1617          * @access private
1618          */
1619         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1620                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1621                 $fname = 'Title::moveOverExistingRedirect';
1622                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1623
1624                 if ( $reason ) {
1625                         $comment .= ": $reason";
1626                 }
1627
1628                 $now = wfTimestampNow();
1629                 $rand = wfRandom();
1630                 $newid = $nt->getArticleID();
1631                 $oldid = $this->getArticleID();
1632                 $dbw =& wfGetDB( DB_MASTER );
1633                 $links = $dbw->tableName( 'links' );
1634
1635                 # Delete the old redirect. We don't save it to history since
1636                 # by definition if we've got here it's rather uninteresting.
1637                 # We have to remove it so that the next step doesn't trigger
1638                 # a conflict on the unique namespace+title index...
1639                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1640
1641                 # Save a null revision in the page's history notifying of the move
1642                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1643                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1644                         true );
1645                 $nullRevId = $nullRevision->insertOn( $dbw );
1646
1647                 # Change the name of the target page:
1648                 $dbw->update( 'page',
1649                         /* SET */ array(
1650                                 'page_touched'   => $dbw->timestamp($now),
1651                                 'page_namespace' => $nt->getNamespace(),
1652                                 'page_title'     => $nt->getDBkey(),
1653                                 'page_latest'    => $nullRevId,
1654                         ),
1655                         /* WHERE */ array( 'page_id' => $oldid ),
1656                         $fname
1657                 );
1658                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1659
1660                 # Recreate the redirect, this time in the other direction.
1661                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1662                 $redirectArticle = new Article( $this );
1663                 $newid = $redirectArticle->insertOn( $dbw );
1664                 $redirectRevision = new Revision( array(
1665                         'page'    => $newid,
1666                         'comment' => $comment,
1667                         'text'    => $redirectText ) );
1668                 $revid = $redirectRevision->insertOn( $dbw );
1669                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1670                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1671
1672                 # Log the move
1673                 $log = new LogPage( 'move' );
1674                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1675
1676                 # Now, we record the link from the redirect to the new title.
1677                 # It should have no other outgoing links...
1678                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1679                 $dbw->insert( 'pagelinks',
1680                         array(
1681                                 'pl_from'      => $newid,
1682                                 'pl_namespace' => $nt->getNamespace(),
1683                                 'pl_title'     => $nt->getDbKey() ),
1684                         $fname );
1685
1686                 # Purge squid
1687                 if ( $wgUseSquid ) {
1688                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1689                         $u = new SquidUpdate( $urls );
1690                         $u->doUpdate();
1691                 }
1692         }
1693
1694         /**
1695          * Move page to non-existing title.
1696          * @param Title &$nt the new Title
1697          * @param int &$newid set to be the new article ID
1698          * @access private
1699          */
1700         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1701                 global $wgUser, $wgLinkCache, $wgUseSquid;
1702                 global $wgMwRedir;
1703                 $fname = 'MovePageForm::moveToNewTitle';
1704                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1705                 if ( $reason ) {
1706                         $comment .= ": $reason";
1707                 }
1708
1709                 $newid = $nt->getArticleID();
1710                 $oldid = $this->getArticleID();
1711                 $dbw =& wfGetDB( DB_MASTER );
1712                 $now = $dbw->timestamp();
1713                 wfSeedRandom();
1714                 $rand = wfRandom();
1715
1716                 # Save a null revision in the page's history notifying of the move
1717                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1718                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1719                         true );
1720                 $nullRevId = $nullRevision->insertOn( $dbw );
1721
1722                 # Rename cur entry
1723                 $dbw->update( 'page',
1724                         /* SET */ array(
1725                                 'page_touched'   => $now,
1726                                 'page_namespace' => $nt->getNamespace(),
1727                                 'page_title'     => $nt->getDBkey(),
1728                                 'page_latest'    => $nullRevId,
1729                         ),
1730                         /* WHERE */ array( 'page_id' => $oldid ),
1731                         $fname
1732                 );
1733
1734                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1735
1736                 # Insert redirect
1737                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1738                 $redirectArticle = new Article( $this );
1739                 $newid = $redirectArticle->insertOn( $dbw );
1740                 $redirectRevision = new Revision( array(
1741                         'page'    => $newid,
1742                         'comment' => $comment,
1743                         'text'    => $redirectText ) );
1744                 $revid = $redirectRevision->insertOn( $dbw );
1745                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1746                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1747
1748                 # Log the move
1749                 $log = new LogPage( 'move' );
1750                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1751
1752                 # Purge caches as per article creation
1753                 Article::onArticleCreate( $nt );
1754
1755                 # Record the just-created redirect's linking to the page
1756                 $dbw->insert( 'pagelinks',
1757                         array(
1758                                 'pl_from'      => $newid,
1759                                 'pl_namespace' => $nt->getNamespace(),
1760                                 'pl_title'     => $nt->getDBkey() ),
1761                         $fname );
1762
1763                 # Non-existent target may have had broken links to it; these must
1764                 # now be touched to update link coloring.
1765                 $nt->touchLinks();
1766
1767                 # Purge old title from squid
1768                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1769                 $titles = $nt->getLinksTo();
1770                 if ( $wgUseSquid ) {
1771                         $urls = $this->getSquidURLs();
1772                         foreach ( $titles as $linkTitle ) {
1773                                 $urls[] = $linkTitle->getInternalURL();
1774                         }
1775                         $u = new SquidUpdate( $urls );
1776                         $u->doUpdate();
1777                 }
1778         }
1779
1780         /**
1781          * Checks if $this can be moved to a given Title
1782          * - Selects for update, so don't call it unless you mean business
1783          *
1784          * @param Title &$nt the new title to check
1785          * @access public
1786          */
1787         function isValidMoveTarget( $nt ) {
1788
1789                 $fname = 'Title::isValidMoveTarget';
1790                 $dbw =& wfGetDB( DB_MASTER );
1791
1792                 # Is it a redirect?
1793                 $id  = $nt->getArticleID();
1794                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1795                         array( 'page_is_redirect','old_text' ),
1796                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1797                         $fname, 'FOR UPDATE' );
1798
1799                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1800                         # Not a redirect
1801                         return false;
1802                 }
1803
1804                 # Does the redirect point to the source?
1805                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1806                         $redirTitle = Title::newFromText( $m[1] );
1807                         if( !is_object( $redirTitle ) ||
1808                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1809                                 return false;
1810                         }
1811                 }
1812
1813                 # Does the article have a history?
1814                 $row = $dbw->selectRow( array( 'page', 'revision'),
1815                         array( 'rev_id' ),
1816                         array( 'page_namespace' => $nt->getNamespace(),
1817                                 'page_title' => $nt->getDBkey(),
1818                                 'page_id=rev_page AND page_latest != rev_id'
1819                         ), $fname, 'FOR UPDATE'
1820                 );
1821
1822                 # Return true if there was no history
1823                 return $row === false;
1824         }
1825
1826         /**
1827          * Create a redirect; fails if the title already exists; does
1828          * not notify RC
1829          *
1830          * @param Title $dest the destination of the redirect
1831          * @param string $comment the comment string describing the move
1832          * @return bool true on success
1833          * @access public
1834          */
1835         function createRedirect( $dest, $comment ) {
1836                 global $wgUser;
1837                 if ( $this->getArticleID() ) {
1838                         return false;
1839                 }
1840
1841                 $fname = 'Title::createRedirect';
1842                 $dbw =& wfGetDB( DB_MASTER );
1843
1844                 $article = new Article( $this );
1845                 $newid = $article->insertOn( $dbw );
1846                 $revision = new Revision( array(
1847                         'page'      => $newid,
1848                         'comment'   => $comment,
1849                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1850                         ) );
1851                 $revisionId = $revision->insertOn( $dbw );
1852                 $article->updateRevisionOn( $dbw, $revision, 0 );
1853
1854                 # Link table
1855                 $dbw->insert( 'pagelinks',
1856                         array(
1857                                 'pl_from'      => $newid,
1858                                 'pl_namespace' => $dest->getNamespace(),
1859                                 'pl_title'     => $dest->getDbKey()
1860                         ), $fname
1861                 );
1862
1863                 Article::onArticleCreate( $this );
1864                 return true;
1865         }
1866
1867         /**
1868          * Get categories to which this Title belongs and return an array of
1869          * categories' names.
1870          *
1871          * @return array an array of parents in the form:
1872          *      $parent => $currentarticle
1873          * @access public
1874          */
1875         function getParentCategories() {
1876                 global $wgContLang,$wgUser;
1877
1878                 $titlekey = $this->getArticleId();
1879                 $sk =& $wgUser->getSkin();
1880                 $parents = array();
1881                 $dbr =& wfGetDB( DB_SLAVE );
1882                 $categorylinks = $dbr->tableName( 'categorylinks' );
1883
1884                 # NEW SQL
1885                 $sql = "SELECT * FROM $categorylinks"
1886                      ." WHERE cl_from='$titlekey'"
1887                          ." AND cl_from <> '0'"
1888                          ." ORDER BY cl_sortkey";
1889
1890                 $res = $dbr->query ( $sql ) ;
1891
1892                 if($dbr->numRows($res) > 0) {
1893                         while ( $x = $dbr->fetchObject ( $res ) )
1894                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1895                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1896                         $dbr->freeResult ( $res ) ;
1897                 } else {
1898                         $data = '';
1899                 }
1900                 return $data;
1901         }
1902
1903         /**
1904          * Get a tree of parent categories
1905          * @param array $children an array with the children in the keys, to check for circular refs
1906          * @return array
1907          * @access public
1908          */
1909         function getParentCategoryTree( $children = array() ) {
1910                 $parents = $this->getParentCategories();
1911
1912                 if($parents != '') {
1913                         foreach($parents as $parent => $current)
1914                         {
1915                                 if ( array_key_exists( $parent, $children ) ) {
1916                                         # Circular reference
1917                                         $stack[$parent] = array();
1918                                 } else {
1919                                         $nt = Title::newFromText($parent);
1920                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1921                                 }
1922                         }
1923                         return $stack;
1924                 } else {
1925                         return array();
1926                 }
1927         }
1928
1929
1930         /**
1931          * Get an associative array for selecting this title from
1932          * the "cur" table
1933          *
1934          * @return array
1935          * @access public
1936          */
1937         function curCond() {
1938                 wfDebugDieBacktrace( 'curCond called' );
1939                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1940         }
1941
1942         /**
1943          * Get an associative array for selecting this title from the
1944          * "old" table
1945          *
1946          * @return array
1947          * @access public
1948          */
1949         function oldCond() {
1950                 wfDebugDieBacktrace( 'oldCond called' );
1951                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1952         }
1953
1954         /**
1955          * Get the revision ID of the previous revision
1956          *
1957          * @param integer $revision  Revision ID. Get the revision that was before this one.
1958          * @return interger $oldrevision|false
1959          */
1960         function getPreviousRevisionID( $revision ) {
1961                 $dbr =& wfGetDB( DB_SLAVE );
1962                 return $dbr->selectField( 'revision', 'rev_id',
1963                         'rev_page=' . IntVal( $this->getArticleId() ) .
1964                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1965         }
1966
1967         /**
1968          * Get the revision ID of the next revision
1969          *
1970          * @param integer $revision  Revision ID. Get the revision that was after this one.
1971          * @return interger $oldrevision|false
1972          */
1973         function getNextRevisionID( $revision ) {
1974                 $dbr =& wfGetDB( DB_SLAVE );
1975                 return $dbr->selectField( 'revision', 'rev_id',
1976                         'rev_page=' . IntVal( $this->getArticleId() ) .
1977                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
1978         }
1979
1980         /**
1981          * Compare with another title.
1982          *
1983          * @param Title $title
1984          * @return bool
1985          */
1986         function equals( &$title ) {
1987                 return $this->getInterwiki() == $title->getInterwiki()
1988                         && $this->getNamespace() == $title->getNamespace()
1989                         && $this->getDbkey() == $title->getDbkey();
1990         }
1991
1992         /**
1993          * Check if page exists
1994          * @return bool
1995          */
1996         function exists() {
1997                 return $this->getArticleId() != 0;
1998         }
1999
2000         /**
2001          * Should a link should be displayed as a known link, just based on its title?
2002          *
2003          * Currently, a self-link with a fragment, special pages and image pages are in
2004          * this category. Special pages never exist in the database. Some images do not
2005          * have description pages in the database, but the description page contains
2006          * useful history information that the user may want to link to.
2007          */
2008         function isAlwaysKnown() {
2009                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2010                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2011         }
2012
2013         /**
2014          * Update page_touched timestamps on pages linking to this title.
2015          * In principal, this could be backgrounded and could also do squid
2016          * purging.
2017          */
2018         function touchLinks() {
2019                 $fname = 'Title::touchLinks';
2020
2021                 $dbw =& wfGetDB( DB_MASTER );
2022
2023                 $res = $dbw->select( 'pagelinks',
2024                         array( 'pl_from' ),
2025                         array(
2026                                 'pl_namespace' => $this->getNamespace(),
2027                                 'pl_title'     => $this->getDbKey() ),
2028                         $fname );
2029                 if ( 0 == $dbw->numRows( $res ) ) {
2030                         return;
2031                 }
2032
2033                 $arr = array();
2034                 $toucharr = array();
2035                 while( $row = $dbw->fetchObject( $res ) ) {
2036                         $toucharr[] = $row->pl_from;
2037                 }
2038
2039                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2040                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2041         }
2042 }
2043 ?>