original_string: public function addAppData(string $key, $value = null): void
      {
          $this->_additionalAppData[$key] = $value;
      }
code: public function addAppData(string $key, $value = null): void
      {
          $this->_additionalAppData[$key] = $value;
      }
code_tokens: public function addAppData ( string $ key , $ value = null ) : void { $ this -> _additionalAppData [ $ key ] = $ value ; }
docstring: Adds additional data to the appData
  
  @param string $key string key
  @param mixed $value value
  @return void
docstring_tokens: Adds additional data to the appData