useSafeApc;
// initialize$apc = newSafeApc();
$apc->setCacheStartTime($_SERVER['REQUEST_TIME']);
$apc->setCacheVersionKey(file_get_contents('apc_version'));
// set key$apc->set('cache key', $value, 100);
// get key (throws SafeApcNotFoundException)$apc->get('cache key');
// delete key$apc->delete('cache key');change version key