115         $index = new SI_Index($fpaths, $fpids);
116         return $index;
148     private $index;  variable in SI_Indexer
150     function __construct(SI_Index $index = null) {  argument
151         if ($index === null) {
152             $this->index = SI_Utils::get_index();
154             $this->index = $index;
162             $this->_remove_invalid_entries($this->index, $all_pages);
179         $page_index = $this->index->filtered(null, null, $pid);
191                 $this->index->add($matched_path, $pid);
197             $this->index->remove($key);
202             $this->index->sort();
209         SI_Utils::save_index($this->index);
218      * @param SI_Index $index   The SI entry index
221     private function _remove_invalid_entries(SI_Index $index, $all_pages) {  argument
223         foreach ($index->pids as $key => $pid) {
233             $index->remove($key);
271             $index = new SI_Index($paths, $pids);
273             self::save_index($index);
277                 $index = unserialize($data);
279                 $index = new SI_Index();
282         return $index;
299     static function save_index(SI_Index $index) {  argument
300         file_put_contents(SUBJ_IDX_FILE, serialize($index));