/** * compute file cache name * @param $file * @return string */ protected function getCacheHash($file) { if (is_null($this->cacheHash)) { $fs_class = explode('\\', get_class($this->fs)); $this->cacheHash = $this->f3->hash($this->f3->stringify($file)) . '.' . strtolower(array_pop($fs_class)); } return $this->cacheHash; }