roundcubemail/program/lib/Roundcube/rcube_imap.php
protected function clear_message_cache($folder = null, $uids = null)
    {
        if ($mcache = $this->get_mcache_engine()) {
            $mcache->clear($folder, $uids);
        }
    }
protected function clear_message_cache($folder = null, $uids = null)
    {
        if ($mcache = $this->get_mcache_engine()) {
            $mcache->clear($folder, $uids);
        }
    }
protected function clear_message_cache ( $ folder = null , $ uids = null ) { if ( $ mcache = $ this -> get_mcache_engine ( ) ) { $ mcache -> clear ( $ folder , $ uids ) ; } }
Clears the messages cache.

@param string $folder Folder name
@param array  $uids   Optional message UIDs to remove from cache
Clears the messages cache .