whether to enforce the garbage collection regardless of [[gcProbability]].
Defaults to false, meaning the actual deletion happens with the probability as specified by [[gcProbability]].
public function gc($force = false)
{
if ($force || mt_rand(0, 1000000) < $this->gcProbability) {
$this->db->getCollection($this->cacheCollection)->remove(['expire' => ['$gt' => 0, '$lt' => time()]]);
}
}