public function addExtra($key, array $options)
    {
        if (!isset($this->extra[$key])) {
            $this->extra[$key] = $options;
        }

        return $this;
    }
public function addExtra($key, array $options)
    {
        if (!isset($this->extra[$key])) {
            $this->extra[$key] = $options;
        }

        return $this;
    }
public function addExtra ( $ key , array $ options ) { if ( ! isset ( $ this -> extra [ $ key ] ) ) { $ this -> extra [ $ key ] = $ options ; } return $ this ; }
Add extra options.

@param string $key
The unique extra namespace.
@param array $options
The extra options.
Add extra options .