original_string: protected function _setClassName($class, $fallback)
      {
          if (!class_exists($class)) {
              $class = $fallback;
          }
          $this->_className = $class;
          $this->_datetimeInstance = new $this->_className;
      }
code: protected function _setClassName($class, $fallback)
      {
          if (!class_exists($class)) {
              $class = $fallback;
          }
          $this->_className = $class;
          $this->_datetimeInstance = new $this->_className;
      }
code_tokens: protected function _setClassName ( $ class , $ fallback ) { if ( ! class_exists ( $ class ) ) { $ class = $ fallback ; } $ this -> _className = $ class ; $ this -> _datetimeInstance = new $ this -> _className ; }
docstring: Set the classname to use when building objects.
  
  @param string $class The classname to use.
  @param string $fallback The classname to use when the preferred class does not exist.
  @return void
docstring_tokens: Set the classname to use when building objects .