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, $transludeonly = false ) {
 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( $s->iw_local ) && isset($s->iw_trans)) {
 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', 'iw_trans' ),
 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                         $s->iw_trans = 0;
 424                 }
 425                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 426                 $wgTitleInterwikiCache[$k] = $s;
 427
 428                 wfProfileOut( $fname );
 429                 return $s->iw_url;
 430         }
 431
 432         /**
 433          * Determine whether the object refers to a page within
 434          * this project.
 435          *
 436          * @return bool TRUE if this is an in-project interwiki link
 437          *      or a wikilink, FALSE otherwise
 438          * @access public
 439          */
 440         function isLocal() {
 441                 global $wgTitleInterwikiCache, $wgDBname;
 442
 443                 if ( $this->mInterwiki != '' ) {
 444                         # Make sure key is loaded into cache
 445                         $this->getInterwikiLink( $this->mInterwiki );
 446                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 447                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 448                 } else {
 449                         return true;
 450                 }
 451         }
 452
 453         /**
 454          * Determine whether the object refers to a page within
 455          * this project and is transcludable.
 456          *
 457          * @return bool TRUE if this is transcludable
 458          * @access public
 459          */
 460         function isTrans() {
 461                 global $wgTitleInterwikiCache, $wgDBname;
 462
 463                 if ($this->mInterwiki == '' || !$this->isLocal())
 464                         return false;
 465                 # Make sure key is loaded into cache
 466                 $this->getInterwikiLink( $this->mInterwiki );
 467                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 468                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 469         }
 470
 471         /**
 472          * Update the page_touched field for an array of title objects
 473          * @todo Inefficient unless the IDs are already loaded into the
 474          *      link cache
 475          * @param array $titles an array of Title objects to be touched
 476          * @param string $timestamp the timestamp to use instead of the
 477          *      default current time
 478          * @static
 479          * @access public
 480          */
 481         function touchArray( $titles, $timestamp = '' ) {
 482                 if ( count( $titles ) == 0 ) {
 483                         return;
 484                 }
 485                 $dbw =& wfGetDB( DB_MASTER );
 486                 if ( $timestamp == '' ) {
 487                         $timestamp = $dbw->timestamp();
 488                 }
 489                 $page = $dbw->tableName( 'page' );
 490                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 491                 $first = true;
 492
 493                 foreach ( $titles as $title ) {
 494                         if ( ! $first ) {
 495                                 $sql .= ',';
 496                         }
 497                         $first = false;
 498                         $sql .= $title->getArticleID();
 499                 }
 500                 $sql .= ')';
 501                 if ( ! $first ) {
 502                         $dbw->query( $sql, 'Title::touchArray' );
 503                 }
 504         }
 505
 506 #----------------------------------------------------------------------------
 507 #       Other stuff
 508 #----------------------------------------------------------------------------
 509
 510         /** Simple accessors */
 511         /**
 512          * Get the text form (spaces not underscores) of the main part
 513          * @return string
 514          * @access public
 515          */
 516         function getText() { return $this->mTextform; }
 517         /**
 518          * Get the URL-encoded form of the main part
 519          * @return string
 520          * @access public
 521          */
 522         function getPartialURL() { return $this->mUrlform; }
 523         /**
 524          * Get the main part with underscores
 525          * @return string
 526          * @access public
 527          */
 528         function getDBkey() { return $this->mDbkeyform; }
 529         /**
 530          * Get the namespace index, i.e. one of the NS_xxxx constants
 531          * @return int
 532          * @access public
 533          */
 534         function getNamespace() { return $this->mNamespace; }
 535         /**
 536          * Get the interwiki prefix (or null string)
 537          * @return string
 538          * @access public
 539          */
 540         function getInterwiki() { return $this->mInterwiki; }
 541         /**
 542          * Get the Title fragment (i.e. the bit after the #)
 543          * @return string
 544          * @access public
 545          */
 546         function getFragment() { return $this->mFragment; }
 547         /**
 548          * Get the default namespace index, for when there is no namespace
 549          * @return int
 550          * @access public
 551          */
 552         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 553
 554         /**
 555          * Get title for search index
 556          * @return string a stripped-down title string ready for the
 557          *      search index
 558          */
 559         function getIndexTitle() {
 560                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 561         }
 562
 563         /**
 564          * Get the prefixed database key form
 565          * @return string the prefixed title, with underscores and
 566          *      any interwiki and namespace prefixes
 567          * @access public
 568          */
 569         function getPrefixedDBkey() {
 570                 $s = $this->prefix( $this->mDbkeyform );
 571                 $s = str_replace( ' ', '_', $s );
 572                 return $s;
 573         }
 574
 575         /**
 576          * Get the prefixed title with spaces.
 577          * This is the form usually used for display
 578          * @return string the prefixed title, with spaces
 579          * @access public
 580          */
 581         function getPrefixedText() {
 582                 global $wgContLang;
 583                 if ( empty( $this->mPrefixedText ) ) {
 584                         $s = $this->prefix( $this->mTextform );
 585                         $s = str_replace( '_', ' ', $s );
 586                         $this->mPrefixedText = $s;
 587                 }
 588                 return $this->mPrefixedText;
 589         }
 590
 591         /**
 592          * Get the prefixed title with spaces, plus any fragment
 593          * (part beginning with '#')
 594          * @return string the prefixed title, with spaces and
 595          *      the fragment, including '#'
 596          * @access public
 597          */
 598         function getFullText() {
 599                 global $wgContLang;
 600                 $text = $this->getPrefixedText();
 601                 if( '' != $this->mFragment ) {
 602                         $text .= '#' . $this->mFragment;
 603                 }
 604                 return $text;
 605         }
 606
 607         /**
 608          * Get a URL-encoded title (not an actual URL) including interwiki
 609          * @return string the URL-encoded form
 610          * @access public
 611          */
 612         function getPrefixedURL() {
 613                 $s = $this->prefix( $this->mDbkeyform );
 614                 $s = str_replace( ' ', '_', $s );
 615
 616                 $s = wfUrlencode ( $s ) ;
 617
 618                 # Cleaning up URL to make it look nice -- is this safe?
 619                 $s = str_replace( '%28', '(', $s );
 620                 $s = str_replace( '%29', ')', $s );
 621
 622                 return $s;
 623         }
 624
 625         /**
 626          * Get a real URL referring to this title, with interwiki link and
 627          * fragment
 628          *
 629          * @param string $query an optional query string, not used
 630          *      for interwiki links
 631          * @return string the URL
 632          * @access public
 633          */
 634         function getFullURL( $query = '' ) {
 635                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 636
 637                 if ( '' == $this->mInterwiki ) {
 638                         return $wgServer . $this->getLocalUrl( $query );
 639                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 640                         $baseUrl = str_replace( '$1', "../../{$this->mInterwiki}/$1", $wgArticlePath );
 641                         $baseUrl = str_replace( '$1', $this->getHashedDirectory() . '/$1', $baseUrl );
 642                 } else {
 643                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 644                 }
 645
 646                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 647                 if ( '' != $namespace ) {
 648                         # Can this actually happen? Interwikis shouldn't be parsed.
 649                         $namepace .= ':';
 650                 }
 651                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 652                 if( $query != '' ) {
 653                         if( false === strpos( $url, '?' ) ) {
 654                                 $url .= '?';
 655                         } else {
 656                                 $url .= '&';
 657                         }
 658                         $url .= $query;
 659                 }
 660                 if ( '' != $this->mFragment ) {
 661                         $url .= '#' . $this->mFragment;
 662                 }
 663                 return $url;
 664         }
 665
 666         /**
 667          * Get a relative directory for putting an HTML version of this article into
 668          */
 669         function getHashedDirectory() {
 670                 global $wgMakeDumpLinks, $wgInputEncoding;
 671                 $dbkey = $this->getDBkey();
 672
 673                 # Split into characters
 674                 if ( $wgInputEncoding == 'UTF-8' ) {
 675                         preg_match_all( '/./us', $dbkey, $m );
 676                 } else {
 677                         preg_match_all( '/./s', $dbkey, $m );
 678                 }
 679                 $chars = $m[0];
 680                 $length = count( $chars );
 681                 $dir = '';
 682
 683                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 684                         if ( $i ) {
 685                                 $dir .= '/';
 686                         }
 687                         if ( $i >= $length ) {
 688                                 $dir .= '_';
 689                         } elseif ( ord( $chars[$i] ) > 32 ) {
 690                                 $dir .= strtolower( $chars[$i] );
 691                         } else {
 692                                 $dir .= sprintf( "%02X", ord( $chars[$i] ) );
 693                         }
 694                 }
 695                 return $dir;
 696         }
 697
 698         function getHashedFilename() {
 699                 $dbkey = $this->getPrefixedDBkey();
 700                 $mainPage = Title::newMainPage();
 701                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 702                         return 'index.html';
 703                 }
 704
 705                 $dir = $this->getHashedDirectory();
 706
 707                 # Replace illegal charcters for Windows paths with underscores
 708                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 709
 710                 # Work out lower case form. We assume we're on a system with case-insensitive
 711                 # filenames, so unless the case is of a special form, we have to disambiguate
 712                 $lowerCase = $this->prefix( ucfirst( strtolower( $this->getDBkey() ) ) );
 713
 714                 # Make it mostly unique
 715                 if ( $lowerCase != $friendlyName  ) {
 716                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 717                 }
 718                 # Handle colon specially by replacing it with tilde
 719                 # Thus we reduce the number of paths with hashes appended
 720                 $friendlyName = str_replace( ':', '~', $friendlyName );
 721                 return "$dir/$friendlyName.html";
 722         }
 723
 724         /**
 725          * Get a URL with no fragment or server name
 726          * @param string $query an optional query string; if not specified,
 727          *      $wgArticlePath will be used.
 728          * @return string the URL
 729          * @access public
 730          */
 731         function getLocalURL( $query = '' ) {
 732                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks, $action;
 733
 734                 if ( $this->isExternal() ) {
 735                         return $this->getFullURL();
 736                 }
 737
 738                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 739                 if ( $wgMakeDumpLinks ) {
 740                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 741                 } elseif ( $query == '' ) {
 742                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 743                 } else {
 744                         global $wgActionPaths;
 745                         if( !empty( $wgActionPaths ) &&
 746                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 747                                 $action = urldecode( $matches[2] );
 748                                 if( isset( $wgActionPaths[$action] ) ) {
 749                                         $query = $matches[1];
 750                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 751                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 752                                         if( $query != '' ) $url .= '?' . $query;
 753                                         return $url;
 754                                 }
 755                         }
 756                         if ( $query == '-' ) {
 757                                 $query = '';
 758                         }
 759                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 760                 }
 761
 762                 if ($action == 'render')
 763                         return $wgServer . $url;
 764                 else
 765                         return $url;
 766         }
 767
 768         /**
 769          * Get an HTML-escaped version of the URL form, suitable for
 770          * using in a link, without a server name or fragment
 771          * @param string $query an optional query string
 772          * @return string the URL
 773          * @access public
 774          */
 775         function escapeLocalURL( $query = '' ) {
 776                 return htmlspecialchars( $this->getLocalURL( $query ) );
 777         }
 778
 779         /**
 780          * Get an HTML-escaped version of the URL form, suitable for
 781          * using in a link, including the server name and fragment
 782          *
 783          * @return string the URL
 784          * @param string $query an optional query string
 785          * @access public
 786          */
 787         function escapeFullURL( $query = '' ) {
 788                 return htmlspecialchars( $this->getFullURL( $query ) );
 789         }
 790
 791         /**
 792          * Get the URL form for an internal link.
 793          * - Used in various Squid-related code, in case we have a different
 794          * internal hostname for the server from the exposed one.
 795          *
 796          * @param string $query an optional query string
 797          * @return string the URL
 798          * @access public
 799          */
 800         function getInternalURL( $query = '' ) {
 801                 global $wgInternalServer;
 802                 return $wgInternalServer . $this->getLocalURL( $query );
 803         }
 804
 805         /**
 806          * Get the edit URL for this Title
 807          * @return string the URL, or a null string if this is an
 808          *      interwiki link
 809          * @access public
 810          */
 811         function getEditURL() {
 812                 global $wgServer, $wgScript;
 813
 814                 if ( '' != $this->mInterwiki ) { return ''; }
 815                 $s = $this->getLocalURL( 'action=edit' );
 816
 817                 return $s;
 818         }
 819
 820         /**
 821          * Get the HTML-escaped displayable text form.
 822          * Used for the title field in <a> tags.
 823          * @return string the text, including any prefixes
 824          * @access public
 825          */
 826         function getEscapedText() {
 827                 return htmlspecialchars( $this->getPrefixedText() );
 828         }
 829
 830         /**
 831          * Is this Title interwiki?
 832          * @return boolean
 833          * @access public
 834          */
 835         function isExternal() { return ( '' != $this->mInterwiki ); }
 836
 837         /**
 838          * Does the title correspond to a protected article?
 839          * @param string $what the action the page is protected from,
 840          *      by default checks move and edit
 841          * @return boolean
 842          * @access public
 843          */
 844         function isProtected($action = '') {
 845                 if ( -1 == $this->mNamespace ) { return true; }
 846                 if($action == 'edit' || $action == '') {
 847                         $a = $this->getRestrictions("edit");
 848                         if ( in_array( 'sysop', $a ) ) { return true; }
 849                 }
 850                 if($action == 'move' || $action == '') {
 851                         $a = $this->getRestrictions("move");
 852                         if ( in_array( 'sysop', $a ) ) { return true; }
 853                 }
 854                 return false;
 855         }
 856
 857         /**
 858          * Is $wgUser is watching this page?
 859          * @return boolean
 860          * @access public
 861          */
 862         function userIsWatching() {
 863                 global $wgUser;
 864
 865                 if ( is_null( $this->mWatched ) ) {
 866                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 867                                 $this->mWatched = false;
 868                         } else {
 869                                 $this->mWatched = $wgUser->isWatched( $this );
 870                         }
 871                 }
 872                 return $this->mWatched;
 873         }
 874
 875         /**
 876          * Is $wgUser perform $action this page?
 877          * @param string $action action that permission needs to be checked for
 878          * @return boolean
 879          * @access private
 880          */
 881         function userCan($action) {
 882                 $fname = 'Title::userCanEdit';
 883                 wfProfileIn( $fname );
 884
 885                 global $wgUser;
 886                 if( NS_SPECIAL == $this->mNamespace ) {
 887                         wfProfileOut( $fname );
 888                         return false;
 889                 }
 890                 if( NS_MEDIAWIKI == $this->mNamespace &&
 891                     !$wgUser->isAllowed('editinterface') ) {
 892                         wfProfileOut( $fname );
 893                         return false;
 894                 }
 895                 if( $this->mDbkeyform == '_' ) {
 896                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 897                         wfProfileOut( $fname );
 898                         return false;
 899                 }
 900
 901                 # protect global styles and js
 902                 if ( NS_MEDIAWIKI == $this->mNamespace
 903                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 904                      && !$wgUser->isAllowed('editinterface') ) {
 905                         wfProfileOut( $fname );
 906                         return false;
 907                 }
 908
 909                 # protect css/js subpages of user pages
 910                 # XXX: this might be better using restrictions
 911                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 912                 if( NS_USER == $this->mNamespace
 913                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 914                         && !$wgUser->isAllowed('editinterface')
 915                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 916                         wfProfileOut( $fname );
 917                         return false;
 918                 }
 919
 920                 foreach( $this->getRestrictions($action) as $right ) {
 921                         // Backwards compatibility, rewrite sysop -> protect
 922                         if ( $right == 'sysop' ) {
 923                                 $right = 'protect';
 924                         }
 925                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 926                                 wfProfileOut( $fname );
 927                                 return false;
 928                         }
 929                 }
 930
 931                 if( $action == 'move' && !$this->isMovable() ) {
 932                         wfProfileOut( $fname );
 933                         return false;
 934                 }
 935
 936                 wfProfileOut( $fname );
 937                 return true;
 938         }
 939
 940         /**
 941          * Can $wgUser edit this page?
 942          * @return boolean
 943          * @access public
 944          */
 945         function userCanEdit() {
 946                 return $this->userCan('edit');
 947         }
 948
 949         /**
 950          * Can $wgUser move this page?
 951          * @return boolean
 952          * @access public
 953          */
 954         function userCanMove() {
 955                 return $this->userCan('move');
 956         }
 957
 958         /**
 959          * Would anybody with sufficient privileges be able to move this page?
 960          * Some pages just aren't movable.
 961          *
 962          * @return boolean
 963          * @access public
 964          */
 965         function isMovable() {
 966                 return Namespace::isMovable( $this->getNamespace() )
 967                         && $this->getInterwiki() == '';
 968         }
 969
 970         /**
 971          * Can $wgUser read this page?
 972          * @return boolean
 973          * @access public
 974          */
 975         function userCanRead() {
 976                 global $wgUser;
 977
 978                 if( $wgUser->isAllowed('read') ) {
 979                         return true;
 980                 } else {
 981                         global $wgWhitelistRead;
 982
 983                         /** If anon users can create an account,
 984                             they need to reach the login page first! */
 985                         if( $wgUser->isAllowed( 'createaccount' )
 986                             && $this->getNamespace() == NS_SPECIAL
 987                             && $this->getText() == 'Userlogin' ) {
 988                                 return true;
 989                         }
 990
 991                         /** some pages are explicitly allowed */
 992                         $name = $this->getPrefixedText();
 993                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
 994                                 return true;
 995                         }
 996
 997                         # Compatibility with old settings
 998                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
 999                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1000                                         return true;
1001                                 }
1002                         }
1003                 }
1004                 return false;
1005         }
1006
1007         /**
1008          * Is this a talk page of some sort?
1009          * @return bool
1010          * @access public
1011          */
1012         function isTalkPage() {
1013                 return Namespace::isTalk( $this->getNamespace() );
1014         }
1015
1016         /**
1017          * Is this a .css or .js subpage of a user page?
1018          * @return bool
1019          * @access public
1020          */
1021         function isCssJsSubpage() {
1022                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1023         }
1024         /**
1025          * Is this a .css subpage of a user page?
1026          * @return bool
1027          * @access public
1028          */
1029         function isCssSubpage() {
1030                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1031         }
1032         /**
1033          * Is this a .js subpage of a user page?
1034          * @return bool
1035          * @access public
1036          */
1037         function isJsSubpage() {
1038                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1039         }
1040         /**
1041          * Protect css/js subpages of user pages: can $wgUser edit
1042          * this page?
1043          *
1044          * @return boolean
1045          * @todo XXX: this might be better using restrictions
1046          * @access public
1047          */
1048         function userCanEditCssJsSubpage() {
1049                 global $wgUser;
1050                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1051         }
1052
1053         /**
1054          * Loads a string into mRestrictions array
1055          * @param string $res restrictions in string format
1056          * @access public
1057          */
1058         function loadRestrictions( $res ) {
1059                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1060                         $temp = explode( '=', trim( $restrict ) );
1061                         if(count($temp) == 1) {
1062                                 // old format should be treated as edit/move restriction
1063                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1064                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1065                         } else {
1066                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1067                         }
1068                 }
1069                 $this->mRestrictionsLoaded = true;
1070         }
1071
1072         /**
1073          * Accessor/initialisation for mRestrictions
1074          * @param string $action action that permission needs to be checked for
1075          * @return array the array of groups allowed to edit this article
1076          * @access public
1077          */
1078         function getRestrictions($action) {
1079                 $id = $this->getArticleID();
1080                 if ( 0 == $id ) { return array(); }
1081
1082                 if ( ! $this->mRestrictionsLoaded ) {
1083                         $dbr =& wfGetDB( DB_SLAVE );
1084                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1085                         $this->loadRestrictions( $res );
1086                 }
1087                 if( isset( $this->mRestrictions[$action] ) ) {
1088                         return $this->mRestrictions[$action];
1089                 }
1090                 return array();
1091         }
1092
1093         /**
1094          * Is there a version of this page in the deletion archive?
1095          * @return int the number of archived revisions
1096          * @access public
1097          */
1098         function isDeleted() {
1099                 $fname = 'Title::isDeleted';
1100                 if ( $this->getNamespace() < 0 ) {
1101                         $n = 0;
1102                 } else {
1103                         $dbr =& wfGetDB( DB_SLAVE );
1104                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1105                                 'ar_title' => $this->getDBkey() ), $fname );
1106                 }
1107                 return (int)$n;
1108         }
1109
1110         /**
1111          * Get the article ID for this Title from the link cache,
1112          * adding it if necessary
1113          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1114          *      for update
1115          * @return int the ID
1116          * @access public
1117          */
1118         function getArticleID( $flags = 0 ) {
1119                 global $wgLinkCache;
1120
1121                 if ( $flags & GAID_FOR_UPDATE ) {
1122                         $oldUpdate = $wgLinkCache->forUpdate( true );
1123                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1124                         $wgLinkCache->forUpdate( $oldUpdate );
1125                 } else {
1126                         if ( -1 == $this->mArticleID ) {
1127                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1128                         }
1129                 }
1130                 return $this->mArticleID;
1131         }
1132
1133         function getLatestRevID() {
1134                 if ($this->mLatestID !== false)
1135                         return $this->mLatestID;
1136
1137                 $db =& wfGetDB(DB_SLAVE);
1138                 return $this->mLatestID = $db->selectField( 'revision',
1139                         "max(rev_id)",
1140                         array('rev_page' => $this->getArticleID()),
1141                         'Title::getLatestRevID' );
1142         }
1143
1144         /**
1145          * This clears some fields in this object, and clears any associated
1146          * keys in the "bad links" section of $wgLinkCache.
1147          *
1148          * - This is called from Article::insertNewArticle() to allow
1149          * loading of the new page_id. It's also called from
1150          * Article::doDeleteArticle()
1151          *
1152          * @param int $newid the new Article ID
1153          * @access public
1154          */
1155         function resetArticleID( $newid ) {
1156                 global $wgLinkCache;
1157                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1158
1159                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1160                 else { $this->mArticleID = $newid; }
1161                 $this->mRestrictionsLoaded = false;
1162                 $this->mRestrictions = array();
1163         }
1164
1165         /**
1166          * Updates page_touched for this page; called from LinksUpdate.php
1167          * @return bool true if the update succeded
1168          * @access public
1169          */
1170         function invalidateCache() {
1171                 if ( wfReadOnly() ) {
1172                         return;
1173                 }
1174
1175                 $now = wfTimestampNow();
1176                 $dbw =& wfGetDB( DB_MASTER );
1177                 $success = $dbw->update( 'page',
1178                         array( /* SET */
1179                                 'page_touched' => $dbw->timestamp()
1180                         ), array( /* WHERE */
1181                                 'page_namespace' => $this->getNamespace() ,
1182                                 'page_title' => $this->getDBkey()
1183                         ), 'Title::invalidateCache'
1184                 );
1185                 return $success;
1186         }
1187
1188         /**
1189          * Prefix some arbitrary text with the namespace or interwiki prefix
1190          * of this object
1191          *
1192          * @param string $name the text
1193          * @return string the prefixed text
1194          * @access private
1195          */
1196         /* private */ function prefix( $name ) {
1197                 global $wgContLang;
1198
1199                 $p = '';
1200                 if ( '' != $this->mInterwiki ) {
1201                         $p = $this->mInterwiki . ':';
1202                 }
1203                 if ( 0 != $this->mNamespace ) {
1204                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1205                 }
1206                 return $p . $name;
1207         }
1208
1209         /**
1210          * Secure and split - main initialisation function for this object
1211          *
1212          * Assumes that mDbkeyform has been set, and is urldecoded
1213          * and uses underscores, but not otherwise munged.  This function
1214          * removes illegal characters, splits off the interwiki and
1215          * namespace prefixes, sets the other forms, and canonicalizes
1216          * everything.
1217          * @return bool true on success
1218          * @access private
1219          */
1220         /* private */ function secureAndSplit() {
1221                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1222                 $fname = 'Title::secureAndSplit';
1223                 wfProfileIn( $fname );
1224
1225                 # Initialisation
1226                 static $rxTc = false;
1227                 if( !$rxTc ) {
1228                         # % is needed as well
1229                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1230                 }
1231
1232                 $this->mInterwiki = $this->mFragment = '';
1233                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1234
1235                 # Clean up whitespace
1236                 #
1237                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1238                 $t = trim( $t, '_' );
1239
1240                 if ( '' == $t ) {
1241                         wfProfileOut( $fname );
1242                         return false;
1243                 }
1244
1245                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1246                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1247                         wfProfileOut( $fname );
1248                         return false;
1249                 }
1250
1251                 $this->mDbkeyform = $t;
1252
1253                 # Initial colon indicating main namespace
1254                 if ( ':' == $t{0} ) {
1255                         $r = substr( $t, 1 );
1256                         $this->mNamespace = NS_MAIN;
1257                 } else {
1258                         # Namespace or interwiki prefix
1259                         $firstPass = true;
1260                         do {
1261                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1262                                         $p = $m[1];
1263                                         $lowerNs = strtolower( $p );
1264                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1265                                                 # Canonical namespace
1266                                                 $t = $m[2];
1267                                                 $this->mNamespace = $ns;
1268                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1269                                                 # Ordinary namespace
1270                                                 $t = $m[2];
1271                                                 $this->mNamespace = $ns;
1272                                         } elseif( $this->getInterwikiLink( $p ) ) {
1273                                                 if( !$firstPass ) {
1274                                                         # Can't make a local interwiki link to an interwiki link.
1275                                                         # That's just crazy!
1276                                                         wfProfileOut( $fname );
1277                                                         return false;
1278                                                 }
1279
1280                                                 # Interwiki link
1281                                                 $t = $m[2];
1282                                                 $this->mInterwiki = $p;
1283
1284                                                 # Redundant interwiki prefix to the local wiki
1285                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1286                                                         if( $t == '' ) {
1287                                                                 # Can't have an empty self-link
1288                                                                 wfProfileOut( $fname );
1289                                                                 return false;
1290                                                         }
1291                                                         $this->mInterwiki = '';
1292                                                         $firstPass = false;
1293                                                         # Do another namespace split...
1294                                                         continue;
1295                                                 }
1296                                         }
1297                                         # If there's no recognized interwiki or namespace,
1298                                         # then let the colon expression be part of the title.
1299                                 }
1300                                 break;
1301                         } while( true );
1302                         $r = $t;
1303                 }
1304
1305                 # We already know that some pages won't be in the database!
1306                 #
1307                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1308                         $this->mArticleID = 0;
1309                 }
1310                 $f = strstr( $r, '#' );
1311                 if ( false !== $f ) {
1312                         $this->mFragment = substr( $f, 1 );
1313                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1314                         # remove whitespace again: prevents "Foo_bar_#"
1315                         # becoming "Foo_bar_"
1316                         $r = preg_replace( '/_*$/', '', $r );
1317                 }
1318
1319                 # Reject illegal characters.
1320                 #
1321                 if( preg_match( $rxTc, $r ) ) {
1322                         wfProfileOut( $fname );
1323                         return false;
1324                 }
1325
1326                 /**
1327                  * Pages with "/./" or "/../" appearing in the URLs will
1328                  * often be unreachable due to the way web browsers deal
1329                  * with 'relative' URLs. Forbid them explicitly.
1330                  */
1331                 if ( strpos( $r, '.' ) !== false &&
1332                      ( $r === '.' || $r === '..' ||
1333                        strpos( $r, './' ) === 0  ||
1334                        strpos( $r, '../' ) === 0 ||
1335                        strpos( $r, '/./' ) !== false ||
1336                        strpos( $r, '/../' ) !== false ) )
1337                 {
1338                         wfProfileOut( $fname );
1339                         return false;
1340                 }
1341
1342                 # We shouldn't need to query the DB for the size.
1343                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1344                 if ( strlen( $r ) > 255 ) {
1345                         wfProfileOut( $fname );
1346                         return false;
1347                 }
1348
1349                 /**
1350                  * Normally, all wiki links are forced to have
1351                  * an initial capital letter so [[foo]] and [[Foo]]
1352                  * point to the same place.
1353                  *
1354                  * Don't force it for interwikis, since the other
1355                  * site might be case-sensitive.
1356                  */
1357                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1358                         $t = $wgContLang->ucfirst( $r );
1359                 } else {
1360                         $t = $r;
1361                 }
1362
1363                 /**
1364                  * Can't make a link to a namespace alone...
1365                  * "empty" local links can only be self-links
1366                  * with a fragment identifier.
1367                  */
1368                 if( $t == '' &&
1369                         $this->mInterwiki == '' &&
1370                         $this->mNamespace != NS_MAIN ) {
1371                         wfProfileOut( $fname );
1372                         return false;
1373                 }
1374
1375                 # Fill fields
1376                 $this->mDbkeyform = $t;
1377                 $this->mUrlform = wfUrlencode( $t );
1378
1379                 $this->mTextform = str_replace( '_', ' ', $t );
1380
1381                 wfProfileOut( $fname );
1382                 return true;
1383         }
1384
1385         /**
1386          * Get a Title object associated with the talk page of this article
1387          * @return Title the object for the talk page
1388          * @access public
1389          */
1390         function getTalkPage() {
1391                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1392         }
1393
1394         /**
1395          * Get a title object associated with the subject page of this
1396          * talk page
1397          *
1398          * @return Title the object for the subject page
1399          * @access public
1400          */
1401         function getSubjectPage() {
1402                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1403         }
1404
1405         /**
1406          * Get an array of Title objects linking to this Title
1407          * Also stores the IDs in the link cache.
1408          *
1409          * @param string $options may be FOR UPDATE
1410          * @return array the Title objects linking here
1411          * @access public
1412          */
1413         function getLinksTo( $options = '' ) {
1414                 global $wgLinkCache;
1415                 $id = $this->getArticleID();
1416
1417                 if ( $options ) {
1418                         $db =& wfGetDB( DB_MASTER );
1419                 } else {
1420                         $db =& wfGetDB( DB_SLAVE );
1421                 }
1422
1423                 $res = $db->select( array( 'page', 'pagelinks' ),
1424                         array( 'page_namespace', 'page_title', 'page_id' ),
1425                         array(
1426                                 'pl_from=page_id',
1427                                 'pl_namespace' => $this->getNamespace(),
1428                                 'pl_title'     => $this->getDbKey() ),
1429                         'Title::getLinksTo',
1430                         $options );
1431
1432                 $retVal = array();
1433                 if ( $db->numRows( $res ) ) {
1434                         while ( $row = $db->fetchObject( $res ) ) {
1435                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1436                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1437                                         $retVal[] = $titleObj;
1438                                 }
1439                         }
1440                 }
1441                 $db->freeResult( $res );
1442                 return $retVal;
1443         }
1444
1445         /**
1446          * Get an array of Title objects referring to non-existent articles linked from this page
1447          *
1448          * @param string $options may be FOR UPDATE
1449          * @return array the Title objects
1450          * @access public
1451          */
1452         function getBrokenLinksFrom( $options = '' ) {
1453                 global $wgLinkCache;
1454
1455                 if ( $options ) {
1456                         $db =& wfGetDB( DB_MASTER );
1457                 } else {
1458                         $db =& wfGetDB( DB_SLAVE );
1459                 }
1460
1461                 $res = $db->safeQuery(
1462                           "SELECT pl_namespace, pl_title
1463                              FROM !
1464                         LEFT JOIN !
1465                                ON pl_namespace=page_namespace
1466                               AND pl_title=page_title
1467                             WHERE pl_from=?
1468                               AND page_namespace IS NULL
1469                                   !",
1470                         $db->tableName( 'pagelinks' ),
1471                         $db->tableName( 'page' ),
1472                         $this->getArticleId(),
1473                         $options );
1474
1475                 $retVal = array();
1476                 if ( $db->numRows( $res ) ) {
1477                         while ( $row = $db->fetchObject( $res ) ) {
1478                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1479                         }
1480                 }
1481                 $db->freeResult( $res );
1482                 return $retVal;
1483         }
1484
1485
1486         /**
1487          * Get a list of URLs to purge from the Squid cache when this
1488          * page changes
1489          *
1490          * @return array the URLs
1491          * @access public
1492          */
1493         function getSquidURLs() {
1494                 return array(
1495                         $this->getInternalURL(),
1496                         $this->getInternalURL( 'action=history' )
1497                 );
1498         }
1499
1500         /**
1501          * Move this page without authentication
1502          * @param Title &$nt the new page Title
1503          * @access public
1504          */
1505         function moveNoAuth( &$nt ) {
1506                 return $this->moveTo( $nt, false );
1507         }
1508
1509         /**
1510          * Check whether a given move operation would be valid.
1511          * Returns true if ok, or a message key string for an error message
1512          * if invalid. (Scarrrrry ugly interface this.)
1513          * @param Title &$nt the new title
1514          * @param bool $auth indicates whether $wgUser's permissions
1515          *      should be checked
1516          * @return mixed true on success, message name on failure
1517          * @access public
1518          */
1519         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1520                 global $wgUser;
1521                 if( !$this or !$nt ) {
1522                         return 'badtitletext';
1523                 }
1524                 if( $this->equals( $nt ) ) {
1525                         return 'selfmove';
1526                 }
1527                 if( !$this->isMovable() || !$nt->isMovable() ) {
1528                         return 'immobile_namespace';
1529                 }
1530
1531                 $fname = 'Title::move';
1532                 $oldid = $this->getArticleID();
1533                 $newid = $nt->getArticleID();
1534
1535                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1536                         return 'articleexists';
1537                 }
1538                 if ( ( '' == $this->getDBkey() ) ||
1539                          ( !$oldid ) ||
1540                      ( '' == $nt->getDBkey() ) ) {
1541                         return 'badarticleerror';
1542                 }
1543
1544                 if ( $auth && (
1545                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1546                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1547                         return 'protectedpage';
1548                 }
1549
1550                 # The move is allowed only if (1) the target doesn't exist, or
1551                 # (2) the target is a redirect to the source, and has no history
1552                 # (so we can undo bad moves right after they're done).
1553
1554                 if ( 0 != $newid ) { # Target exists; check for validity
1555                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1556                                 return 'articleexists';
1557                         }
1558                 }
1559                 return true;
1560         }
1561
1562         /**
1563          * Move a title to a new location
1564          * @param Title &$nt the new title
1565          * @param bool $auth indicates whether $wgUser's permissions
1566          *      should be checked
1567          * @return mixed true on success, message name on failure
1568          * @access public
1569          */
1570         function moveTo( &$nt, $auth = true, $reason = '' ) {
1571                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1572                 if( is_string( $err ) ) {
1573                         return $err;
1574                 }
1575
1576                 $pageid = $this->getArticleID();
1577                 if( $nt->exists() ) {
1578                         $this->moveOverExistingRedirect( $nt, $reason );
1579                         $pageCountChange = 0;
1580                 } else { # Target didn't exist, do normal move.
1581                         $this->moveToNewTitle( $nt, $newid, $reason );
1582                         $pageCountChange = 1;
1583                 }
1584                 $redirid = $this->getArticleID();
1585
1586                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1587                 $dbw =& wfGetDB( DB_MASTER );
1588                 $categorylinks = $dbw->tableName( 'categorylinks' );
1589                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1590                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1591                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1592                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1593
1594                 # Update watchlists
1595
1596                 $oldnamespace = $this->getNamespace() & ~1;
1597                 $newnamespace = $nt->getNamespace() & ~1;
1598                 $oldtitle = $this->getDBkey();
1599                 $newtitle = $nt->getDBkey();
1600
1601                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1602                         WatchedItem::duplicateEntries( $this, $nt );
1603                 }
1604
1605                 # Update search engine
1606                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1607                 $u->doUpdate();
1608                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1609                 $u->doUpdate();
1610
1611                 # Update site_stats
1612                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1613                         # Moved out of main namespace
1614                         # not viewed, edited, removing
1615                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1616                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1617                         # Moved into main namespace
1618                         # not viewed, edited, adding
1619                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1620                 } elseif ( $pageCountChange ) {
1621                         # Added redirect
1622                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1623                 } else{
1624                         $u = false;
1625                 }
1626                 if ( $u ) {
1627                         $u->doUpdate();
1628                 }
1629
1630                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1631                 return true;
1632         }
1633
1634         /**
1635          * Move page to a title which is at present a redirect to the
1636          * source page
1637          *
1638          * @param Title &$nt the page to move to, which should currently
1639          *      be a redirect
1640          * @access private
1641          */
1642         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1643                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1644                 $fname = 'Title::moveOverExistingRedirect';
1645                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1646
1647                 if ( $reason ) {
1648                         $comment .= ": $reason";
1649                 }
1650
1651                 $now = wfTimestampNow();
1652                 $rand = wfRandom();
1653                 $newid = $nt->getArticleID();
1654                 $oldid = $this->getArticleID();
1655                 $dbw =& wfGetDB( DB_MASTER );
1656                 $links = $dbw->tableName( 'links' );
1657
1658                 # Delete the old redirect. We don't save it to history since
1659                 # by definition if we've got here it's rather uninteresting.
1660                 # We have to remove it so that the next step doesn't trigger
1661                 # a conflict on the unique namespace+title index...
1662                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1663
1664                 # Save a null revision in the page's history notifying of the move
1665                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1666                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1667                         true );
1668                 $nullRevId = $nullRevision->insertOn( $dbw );
1669
1670                 # Change the name of the target page:
1671                 $dbw->update( 'page',
1672                         /* SET */ array(
1673                                 'page_touched'   => $dbw->timestamp($now),
1674                                 'page_namespace' => $nt->getNamespace(),
1675                                 'page_title'     => $nt->getDBkey(),
1676                                 'page_latest'    => $nullRevId,
1677                         ),
1678                         /* WHERE */ array( 'page_id' => $oldid ),
1679                         $fname
1680                 );
1681                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1682
1683                 # Recreate the redirect, this time in the other direction.
1684                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1685                 $redirectArticle = new Article( $this );
1686                 $newid = $redirectArticle->insertOn( $dbw );
1687                 $redirectRevision = new Revision( array(
1688                         'page'    => $newid,
1689                         'comment' => $comment,
1690                         'text'    => $redirectText ) );
1691                 $revid = $redirectRevision->insertOn( $dbw );
1692                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1693                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1694
1695                 # Log the move
1696                 $log = new LogPage( 'move' );
1697                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1698
1699                 # Now, we record the link from the redirect to the new title.
1700                 # It should have no other outgoing links...
1701                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1702                 $dbw->insert( 'pagelinks',
1703                         array(
1704                                 'pl_from'      => $newid,
1705                                 'pl_namespace' => $nt->getNamespace(),
1706                                 'pl_title'     => $nt->getDbKey() ),
1707                         $fname );
1708
1709                 # Purge squid
1710                 if ( $wgUseSquid ) {
1711                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1712                         $u = new SquidUpdate( $urls );
1713                         $u->doUpdate();
1714                 }
1715         }
1716
1717         /**
1718          * Move page to non-existing title.
1719          * @param Title &$nt the new Title
1720          * @param int &$newid set to be the new article ID
1721          * @access private
1722          */
1723         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1724                 global $wgUser, $wgLinkCache, $wgUseSquid;
1725                 global $wgMwRedir;
1726                 $fname = 'MovePageForm::moveToNewTitle';
1727                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1728                 if ( $reason ) {
1729                         $comment .= ": $reason";
1730                 }
1731
1732                 $newid = $nt->getArticleID();
1733                 $oldid = $this->getArticleID();
1734                 $dbw =& wfGetDB( DB_MASTER );
1735                 $now = $dbw->timestamp();
1736                 wfSeedRandom();
1737                 $rand = wfRandom();
1738
1739                 # Save a null revision in the page's history notifying of the move
1740                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1741                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1742                         true );
1743                 $nullRevId = $nullRevision->insertOn( $dbw );
1744
1745                 # Rename cur entry
1746                 $dbw->update( 'page',
1747                         /* SET */ array(
1748                                 'page_touched'   => $now,
1749                                 'page_namespace' => $nt->getNamespace(),
1750                                 'page_title'     => $nt->getDBkey(),
1751                                 'page_latest'    => $nullRevId,
1752                         ),
1753                         /* WHERE */ array( 'page_id' => $oldid ),
1754                         $fname
1755                 );
1756
1757                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1758
1759                 # Insert redirect
1760                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1761                 $redirectArticle = new Article( $this );
1762                 $newid = $redirectArticle->insertOn( $dbw );
1763                 $redirectRevision = new Revision( array(
1764                         'page'    => $newid,
1765                         'comment' => $comment,
1766                         'text'    => $redirectText ) );
1767                 $revid = $redirectRevision->insertOn( $dbw );
1768                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1769                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1770
1771                 # Log the move
1772                 $log = new LogPage( 'move' );
1773                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1774
1775                 # Purge caches as per article creation
1776                 Article::onArticleCreate( $nt );
1777
1778                 # Record the just-created redirect's linking to the page
1779                 $dbw->insert( 'pagelinks',
1780                         array(
1781                                 'pl_from'      => $newid,
1782                                 'pl_namespace' => $nt->getNamespace(),
1783                                 'pl_title'     => $nt->getDBkey() ),
1784                         $fname );
1785
1786                 # Non-existent target may have had broken links to it; these must
1787                 # now be touched to update link coloring.
1788                 $nt->touchLinks();
1789
1790                 # Purge old title from squid
1791                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1792                 $titles = $nt->getLinksTo();
1793                 if ( $wgUseSquid ) {
1794                         $urls = $this->getSquidURLs();
1795                         foreach ( $titles as $linkTitle ) {
1796                                 $urls[] = $linkTitle->getInternalURL();
1797                         }
1798                         $u = new SquidUpdate( $urls );
1799                         $u->doUpdate();
1800                 }
1801         }
1802
1803         /**
1804          * Checks if $this can be moved to a given Title
1805          * - Selects for update, so don't call it unless you mean business
1806          *
1807          * @param Title &$nt the new title to check
1808          * @access public
1809          */
1810         function isValidMoveTarget( $nt ) {
1811
1812                 $fname = 'Title::isValidMoveTarget';
1813                 $dbw =& wfGetDB( DB_MASTER );
1814
1815                 # Is it a redirect?
1816                 $id  = $nt->getArticleID();
1817                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1818                         array( 'page_is_redirect','old_text' ),
1819                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1820                         $fname, 'FOR UPDATE' );
1821
1822                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1823                         # Not a redirect
1824                         return false;
1825                 }
1826
1827                 # Does the redirect point to the source?
1828                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1829                         $redirTitle = Title::newFromText( $m[1] );
1830                         if( !is_object( $redirTitle ) ||
1831                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1832                                 return false;
1833                         }
1834                 }
1835
1836                 # Does the article have a history?
1837                 $row = $dbw->selectRow( array( 'page', 'revision'),
1838                         array( 'rev_id' ),
1839                         array( 'page_namespace' => $nt->getNamespace(),
1840                                 'page_title' => $nt->getDBkey(),
1841                                 'page_id=rev_page AND page_latest != rev_id'
1842                         ), $fname, 'FOR UPDATE'
1843                 );
1844
1845                 # Return true if there was no history
1846                 return $row === false;
1847         }
1848
1849         /**
1850          * Create a redirect; fails if the title already exists; does
1851          * not notify RC
1852          *
1853          * @param Title $dest the destination of the redirect
1854          * @param string $comment the comment string describing the move
1855          * @return bool true on success
1856          * @access public
1857          */
1858         function createRedirect( $dest, $comment ) {
1859                 global $wgUser;
1860                 if ( $this->getArticleID() ) {
1861                         return false;
1862                 }
1863
1864                 $fname = 'Title::createRedirect';
1865                 $dbw =& wfGetDB( DB_MASTER );
1866
1867                 $article = new Article( $this );
1868                 $newid = $article->insertOn( $dbw );
1869                 $revision = new Revision( array(
1870                         'page'      => $newid,
1871                         'comment'   => $comment,
1872                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1873                         ) );
1874                 $revisionId = $revision->insertOn( $dbw );
1875                 $article->updateRevisionOn( $dbw, $revision, 0 );
1876
1877                 # Link table
1878                 $dbw->insert( 'pagelinks',
1879                         array(
1880                                 'pl_from'      => $newid,
1881                                 'pl_namespace' => $dest->getNamespace(),
1882                                 'pl_title'     => $dest->getDbKey()
1883                         ), $fname
1884                 );
1885
1886                 Article::onArticleCreate( $this );
1887                 return true;
1888         }
1889
1890         /**
1891          * Get categories to which this Title belongs and return an array of
1892          * categories' names.
1893          *
1894          * @return array an array of parents in the form:
1895          *      $parent => $currentarticle
1896          * @access public
1897          */
1898         function getParentCategories() {
1899                 global $wgContLang,$wgUser;
1900
1901                 $titlekey = $this->getArticleId();
1902                 $sk =& $wgUser->getSkin();
1903                 $parents = array();
1904                 $dbr =& wfGetDB( DB_SLAVE );
1905                 $categorylinks = $dbr->tableName( 'categorylinks' );
1906
1907                 # NEW SQL
1908                 $sql = "SELECT * FROM $categorylinks"
1909                      ." WHERE cl_from='$titlekey'"
1910                          ." AND cl_from <> '0'"
1911                          ." ORDER BY cl_sortkey";
1912
1913                 $res = $dbr->query ( $sql ) ;
1914
1915                 if($dbr->numRows($res) > 0) {
1916                         while ( $x = $dbr->fetchObject ( $res ) )
1917                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1918                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1919                         $dbr->freeResult ( $res ) ;
1920                 } else {
1921                         $data = '';
1922                 }
1923                 return $data;
1924         }
1925
1926         /**
1927          * Get a tree of parent categories
1928          * @param array $children an array with the children in the keys, to check for circular refs
1929          * @return array
1930          * @access public
1931          */
1932         function getParentCategoryTree( $children = array() ) {
1933                 $parents = $this->getParentCategories();
1934
1935                 if($parents != '') {
1936                         foreach($parents as $parent => $current)
1937                         {
1938                                 if ( array_key_exists( $parent, $children ) ) {
1939                                         # Circular reference
1940                                         $stack[$parent] = array();
1941                                 } else {
1942                                         $nt = Title::newFromText($parent);
1943                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1944                                 }
1945                         }
1946                         return $stack;
1947                 } else {
1948                         return array();
1949                 }
1950         }
1951
1952
1953         /**
1954          * Get an associative array for selecting this title from
1955          * the "cur" table
1956          *
1957          * @return array
1958          * @access public
1959          */
1960         function curCond() {
1961                 wfDebugDieBacktrace( 'curCond called' );
1962                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1963         }
1964
1965         /**
1966          * Get an associative array for selecting this title from the
1967          * "old" table
1968          *
1969          * @return array
1970          * @access public
1971          */
1972         function oldCond() {
1973                 wfDebugDieBacktrace( 'oldCond called' );
1974                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1975         }
1976
1977         /**
1978          * Get the revision ID of the previous revision
1979          *
1980          * @param integer $revision  Revision ID. Get the revision that was before this one.
1981          * @return interger $oldrevision|false
1982          */
1983         function getPreviousRevisionID( $revision ) {
1984                 $dbr =& wfGetDB( DB_SLAVE );
1985                 return $dbr->selectField( 'revision', 'rev_id',
1986                         'rev_page=' . IntVal( $this->getArticleId() ) .
1987                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1988         }
1989
1990         /**
1991          * Get the revision ID of the next revision
1992          *
1993          * @param integer $revision  Revision ID. Get the revision that was after this one.
1994          * @return interger $oldrevision|false
1995          */
1996         function getNextRevisionID( $revision ) {
1997                 $dbr =& wfGetDB( DB_SLAVE );
1998                 return $dbr->selectField( 'revision', 'rev_id',
1999                         'rev_page=' . IntVal( $this->getArticleId() ) .
2000                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
2001         }
2002
2003         /**
2004          * Compare with another title.
2005          *
2006          * @param Title $title
2007          * @return bool
2008          */
2009         function equals( &$title ) {
2010                 return $this->getInterwiki() == $title->getInterwiki()
2011                         && $this->getNamespace() == $title->getNamespace()
2012                         && $this->getDbkey() == $title->getDbkey();
2013         }
2014
2015         /**
2016          * Check if page exists
2017          * @return bool
2018          */
2019         function exists() {
2020                 return $this->getArticleId() != 0;
2021         }
2022
2023         /**
2024          * Should a link should be displayed as a known link, just based on its title?
2025          *
2026          * Currently, a self-link with a fragment, special pages and image pages are in
2027          * this category. Special pages never exist in the database. Some images do not
2028          * have description pages in the database, but the description page contains
2029          * useful history information that the user may want to link to.
2030          */
2031         function isAlwaysKnown() {
2032                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2033                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2034         }
2035
2036         /**
2037          * Update page_touched timestamps on pages linking to this title.
2038          * In principal, this could be backgrounded and could also do squid
2039          * purging.
2040          */
2041         function touchLinks() {
2042                 $fname = 'Title::touchLinks';
2043
2044                 $dbw =& wfGetDB( DB_MASTER );
2045
2046                 $res = $dbw->select( 'pagelinks',
2047                         array( 'pl_from' ),
2048                         array(
2049                                 'pl_namespace' => $this->getNamespace(),
2050                                 'pl_title'     => $this->getDbKey() ),
2051                         $fname );
2052                 if ( 0 == $dbw->numRows( $res ) ) {
2053                         return;
2054                 }
2055
2056                 $arr = array();
2057                 $toucharr = array();
2058                 while( $row = $dbw->fetchObject( $res ) ) {
2059                         $toucharr[] = $row->pl_from;
2060                 }
2061
2062                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2063                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2064         }
2065 }
2066 ?>