original_string: protected function _rollBack()
      {
          $this->_connect();
          $this->_connection->rollback();
          $this->_connection->autocommit(true);
      }
code: protected function _rollBack()
      {
          $this->_connect();
          $this->_connection->rollback();
          $this->_connection->autocommit(true);
      }
code_tokens: protected function _rollBack ( ) { $ this -> _connect ( ) ; $ this -> _connection -> rollback ( ) ; $ this -> _connection -> autocommit ( true ) ; }
docstring: Roll-back a transaction.
  
  @return void
docstring_tokens: Roll - back a transaction .