(PHP 5 >= 5.4.0)
SessionHandler::gc — Cleanup old sessions
Cleans up expired sessions. Called randomly by PHP internally when a session starts or when session_start() is invoked. The frequency this is called is based on the session.gc_divisor and session.gc_probability configuration directives.
If this class is extended by inheritiance, calling the parent
gc method will invoke the
wrapper for this method and therefor invoke the associated internal callback. This allows this method to be
overidden and or intercepted and filtered.
For more information on what this method is expected to do, please refer to the documentation at SessionHandlerInterface::gc().
Sessions that have not updated for the last
maxlifetime seconds will be removed.
The return value (usually
TRUE on success,
FALSE on failure). Note this value is returned internally to PHP for processing.