public function add($key, $value)
    {
        if (! isset($this->_params[$key])) {
            $this->_params[$key] = array();
        }
        $this->_params[$key][] = $value;
    }
public function add($key, $value)
    {
        if (! isset($this->_params[$key])) {
            $this->_params[$key] = array();
        }
        $this->_params[$key][] = $value;
    }
public function add ( $ key , $ value ) { if ( ! isset ( $ this -> _params [ $ key ] ) ) { $ this -> _params [ $ key ] = array ( ) ; } $ this -> _params [ $ key ] [ ] = $ value ; }
add param.

@access  public
@param   string  $key
@param   string  $value
add param .