zendframework/zf2 — pull request #842 by adamlundrigan (2012-02-26 02:58:28+00:00)
Title: [ZF-11610] Added string cast to argument of ctype_digit calls 

ctype_digit converts int < 256 to character:
http://ca3.php.net/manual/en/function.ctype-digit.php#87113