zendframework/zf2 — pull request #3018 by pkarc (2012-11-19 22:52:01+00:00)
Title: Callback Options as 2nd param

http://framework.zend.com/manual/2.0/en/modules/zend.validator.set.html#adding-options

callbackOptions should be the 2nd param to pass to the callbackFunction
not the last param (it could be the $context as optional)