plugin=diff is not implemented.
http://tuotehhou.y.ribbon.to/index.php?%2BPHP%2B%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E8%AA%AD%E3%81%BF%E8%BE%BC%E3%81%BF
plugin=diff is not implemented.