(PHP 5 >= 5.3.0)
RecursiveTreeIterator::setPrefixPart — Set a part of the prefix
$part
   , string $value
   )Sets a part of the prefix used in the graphic tree.
This function is currently not documented; only its argument list is available.
part
     One of the RecursiveTreeIterator::PREFIX_* constants.
value
     
       The value to assign to the part of the prefix specified in part.
      
No value is returned.