44     protected array $spatial_idx = [];  variable in helper_plugin_spatialhelper_index
64             $this->spatial_idx = unserialize(
68             Logger::debug('done loading spatial index', $this->spatial_idx);
137         if (!array_key_exists($geohash, $this->spatial_idx)) {
143             $knownHashes = $this->findHashesForId($id, $this->spatial_idx);
146                 $pageIds = $this->spatial_idx [$geohash];
159                 $knownIds = $this->spatial_idx [$knownHash];
165                 $this->spatial_idx [$knownHash] = $knownIds;
167                 $pageIds = $this->spatial_idx[$geohash];
172         $this->spatial_idx [$geohash] = $pageIds;
201         return io_saveFile($this->idx_dir . '/spatial.idx', serialize($this->spatial_idx));
310         $knownHashes = $this->findHashesForId($id, $this->spatial_idx);
317         $knownIds = $this->spatial_idx [$knownHash];
321         $this->spatial_idx [$knownHash] = $knownIds;
322         if (empty($this->spatial_idx [$knownHash])) {
323             unset($this->spatial_idx [$knownHash]);