original_string: public function getKeyValue($key)
      {
          return empty($this->_data[$key]) ? null: $this->_data[$key];
      }
code: public function getKeyValue($key)
      {
          return empty($this->_data[$key]) ? null: $this->_data[$key];
      }
code_tokens: public function getKeyValue ( $ key ) { return empty ( $ this -> _data [ $ key ] ) ? null : $ this -> _data [ $ key ] ; }
docstring: Get data value by key
  
  @param mixed $key
  @return mixed
docstring_tokens: Get data value by key