Sescle will automatically remove PHP session files
if they have not been modified for longer than the
'garbage collection timeout'. This can help
aleviate high-load situations where PHP itself
cannot be relied on to remove expired sessions, or
in a high-security environment where sessions
containing sensitive data must be removed in a
timely fashion. It requires Linux >=2.6.13 and
Glibc >=2.4.
