/usr/share/aide/config/aide/aide.conf.d/31_aide_php5 is in aide-common 0.16~a2.git20130520-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | /var/lib/php5$ VarDir
/var/lib/php5/sess_[0-9a-z]{32}$ VarFile+ANF+ARF
|