roundcubemail session table never cleaned/ pruned in database

Hi,

Noticed that the roundcubemail session table never gets cleaned.

My php.ini (and it seems any other php.ini file) in original form on an Ubuntu installation shows

"session.gc_probability = 0"

If this is changed to "session.gc_probability = 1" will this table be cleaned?

This is not an iRedMail issue really. Probably more of a php issue but this seemed like as good a place as any to ask.

==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.0
- Linux/BSD distribution name and version: Ubuntu 14 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDB
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue: NA
====