Description:
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I realize you do not maintain this module against specific distro pkgs but any RHEL or CentOS 5.5 users (and maybe even some Fedora users) will not be able to run php-PAM with the latest updates.

A recent update to pam_krb5 in CentOS 5.5 causes php-PAM module to fail to authenticate users.  update version is pam_krb5-2.2.14-15.  Changelog entries from this pkg are: 

* Mon Dec 14 2009 Nalin Dahyabhai <nalin@redhat.com> 2.2.14-15
- update backport for selecting which key to use for validation so that it prefers services with the local host name as the instance, from HEAD (more of #450776)

* Fri Dec 11 2009 Nalin Dahyabhai <nalin@redhat.com> 2.2.14-14
- backport the "multiple_ccaches" option from HEAD, requiring that it be enabled to not immediately remove an old ccache when asked to create a new one (#463417)

* Fri Dec 11 2009 Nalin Dahyabhai <nalin@redhat.com> 2.2.14-13
- add patch to add the "chpw_prompt" option, to allow the older behavior of attempting a password-change during authentication if libkrb5 detects an expired password, based on patch from Olivier Fourdan (#509092)

* Mon Jun 15 2009 Nalin Dahyabhai <nalin@redhat.com> 2.2.14-12
- don't vary the password prompt depending on whether or not the user exists or is known to the KDC (CVE-2009-1384, #505265)
- prefer using the "host" service when verifying that a TGT isn't forged, from HEAD (#450776)

* Fri Mar 27 2009 Nalin Dahyabhai <nalin@redhat.com> 2.2.14-11
- don't enforce minimum_uid when no_user_check is also used, from HEAD (#490404)
- don't try to get password-changing creds with all of the flags set that we'd request for a TGT (#489015)


Expected result:
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httpd: pam_krb5[5892]: authentication succeeds for 'user'

Actual result:
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httpd: pam_krb5[5624]: authentication fails for 'user': Authentication failure (Cannot read password)