public function offsetExists($offset) {
    if (is_string($offset)) {
      return $this->get($offset) ? true : false;
    }
    return parent::offsetExists($offset);
  }
public function offsetExists($offset) {
    if (is_string($offset)) {
      return $this->get($offset) ? true : false;
    }
    return parent::offsetExists($offset);
  }
public function offsetExists ( $ offset ) { if ( is_string ( $ offset ) ) { return $ this -> get ( $ offset ) ? true : false ; } return parent :: offsetExists ( $ offset ) ; }
Array access. Check for existence using external_id or offset.
Array access . Check for existence using external_id or offset .