public function mtime($key)
    {
        if ($object = $this->tryGetObject($key)) {
            return (new \DateTime($object->getLastModified()))->format('U');
        }

        return false;
    }
public function mtime($key)
    {
        if ($object = $this->tryGetObject($key)) {
            return (new \DateTime($object->getLastModified()))->format('U');
        }

        return false;
    }
public function mtime ( $ key ) { if ( $ object = $ this -> tryGetObject ( $ key ) ) { return ( new \ DateTime ( $ object -> getLastModified ( ) ) ) -> format ( 'U' ) ; } return false ; }
Returns the last modified time.

@param string $key

@return int|bool An UNIX like timestamp or false
Returns the last modified time .