+ /**
+ * Returns a list of hidden categories this page is a member of.
+ * Uses the page_props and categorylinks tables.
+ *
+ * @return array Array of Title objects
+ */
+ function getHiddenCategories() {
+ $result = array();
+ $id = $this->mTitle->getArticleID();
+ if( $id == 0 ) {
+ return array();
+ }
+
+ $dbr = wfGetDB( DB_SLAVE );
+ $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
+ array( 'cl_to' ),
+ array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
+ 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
+ 'Article:getHiddenCategories' );
+ if ( false !== $res ) {
+ if ( $dbr->numRows( $res ) ) {
+ while ( $row = $dbr->fetchObject( $res ) ) {
+ $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
+ }
+ }
+ }
+ $dbr->freeResult( $res );
+ return $result;
+ }
+