crack extension and gecos info

One of the really handy things that the cracklib library does is evaluate whether a password is based on a user's gecos information. The php crack extension (--with-crack) allows me to test password strength, but it doesn't allow me to specify the users name/gecos information. Instead, it uses the information of the current user (in this case, the uid of the webserver process). Is there a way to provide the equivalent of the gecos data to crack_check() somehow? Seth