original_string: protected function _advanceTracker($tracker)
      {
          if (!($tracker instanceof Iterator)) {
              throw $this->_createInvalidArgumentException($this->__('Can only advance an Iterator tracker'), null, null, $tracker);
          }
  
          $tracker->next();
      }
code: protected function _advanceTracker($tracker)
      {
          if (!($tracker instanceof Iterator)) {
              throw $this->_createInvalidArgumentException($this->__('Can only advance an Iterator tracker'), null, null, $tracker);
          }
  
          $tracker->next();
      }
code_tokens: protected function _advanceTracker ( $ tracker ) { if ( ! ( $ tracker instanceof Iterator ) ) { throw $ this -> _createInvalidArgumentException ( $ this -> __ ( 'Can only advance an Iterator tracker' ) , null , null , $ tracker ) ; } $ tracker -> next ( ) ; }
docstring: Advances the iterator forward.
  
  @since [*next-version*]
  
  @param Iterator $tracker The iterator used to track the loop.
  
  @throws InvalidArgumentException If problem advancing iterator.
docstring_tokens: Advances the iterator forward .