This is it:

Aug 10 07:39:01 aspire-s /USR/SBIN/CRON[14084]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -r -0 rm)
I notided this yesterday right after I installed PTS. I have never ever installed or touched anything PHP connected on my Ubuntu, the only thing connected to PHP on my system is that dependency that PTS needed during installation.

Can somebody tell me what this line does or means. Thanks.