original_string: private function _login($id){
      if ( $this->check() && $id ){
        $this
          ->_authenticate($id)
          ->_user_info()
          ->_init_dir(true)
          ->save_session();
      }
      return $this;
    }
code: private function _login($id){
      if ( $this->check() && $id ){
        $this
          ->_authenticate($id)
          ->_user_info()
          ->_init_dir(true)
          ->save_session();
      }
      return $this;
    }
code_tokens: private function _login ( $ id ) { if ( $ this -> check ( ) && $ id ) { $ this -> _authenticate ( $ id ) -> _user_info ( ) -> _init_dir ( true ) -> save_session ( ) ; } return $ this ; }
docstring: initialize and saves session
  @return $this
docstring_tokens: initialize and saves session