original_string: public function add($key, $value)
      {
          if (! isset($this->_params[$key])) {
              $this->_params[$key] = array();
          }
          $this->_params[$key][] = $value;
      }
code: public function add($key, $value)
      {
          if (! isset($this->_params[$key])) {
              $this->_params[$key] = array();
          }
          $this->_params[$key][] = $value;
      }
code_tokens: public function add ( $ key , $ value ) { if ( ! isset ( $ this -> _params [ $ key ] ) ) { $ this -> _params [ $ key ] = array ( ) ; } $ this -> _params [ $ key ] [ ] = $ value ; }
docstring: add param.
  
  @access  public
  @param   string  $key
  @param   string  $value
docstring_tokens: add param .