original_string: public function close() {
          if (!empty($this->_fp)) {
              fclose($this->_fp);
              $this->_fp = null;
          }
      }
code: public function close() {
          if (!empty($this->_fp)) {
              fclose($this->_fp);
              $this->_fp = null;
          }
      }
code_tokens: public function close ( ) { if ( ! empty ( $ this -> _fp ) ) { fclose ( $ this -> _fp ) ; $ this -> _fp = null ; } }
docstring: Release iteration related resources
  
  @return void
docstring_tokens: Release iteration related resources