public function getMetadata($key)
    {
        return isset($this->_metadata[$key])
            ? $this->_metadata[$key]
            : null;
    }
public function getMetadata($key)
    {
        return isset($this->_metadata[$key])
            ? $this->_metadata[$key]
            : null;
    }
public function getMetadata ( $ key ) { return isset ( $ this -> _metadata [ $ key ] ) ? $ this -> _metadata [ $ key ] : null ; }
Retrieves metadata from this object.

@param string $key  The metadata key.

@return mixed  The metadata, or null if it doesn't exist.
Retrieves metadata from this object .