This file is indexed.

/etc/cron.d/php5 is in php5-common 5.6.33+dfsg-0+deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# /etc/cron.d/php5: crontab fragment for php5
#  This purges session files in session.save_path older than X,
#  where X is defined in seconds as the largest value of
#  session.gc_maxlifetime from all your SAPI php.ini files
#  or 24 minutes if not defined.  The script triggers only
#  when session.save_handler=files.
#
#  WARNING: The scripts tries hard to honour all relevant
#  session PHP options, but if you do something unusual
#  you have to disable this script and take care of your
#  sessions yourself.

# Look for and purge old sessions every 30 minutes
09,39 *     * * *     root   [ -x /usr/lib/php5/sessionclean ] && /usr/lib/php5/sessionclean