public function flush($delay = 0) {
    $result = $this->memcache->flush();
    $this->result_code = $result ? self::RES_SUCCESS : self::RES_NOTSTORED;
    return $result;
  }
public function flush($delay = 0) {
    $result = $this->memcache->flush();
    $this->result_code = $result ? self::RES_SUCCESS : self::RES_NOTSTORED;
    return $result;
  }
public function flush ( $ delay = 0 ) { $ result = $ this -> memcache -> flush ( ) ; $ this -> result_code = $ result ? self :: RES_SUCCESS : self :: RES_NOTSTORED ; return $ result ; }
Invalidates all existing cache items immediately.

@param int $delay This parameter is ignored.

@return bool true on success, or false on failure.
Invalidates all existing cache items immediately .