public function isValid($cacheID, $cacheTime, $renew_cachedir = true)
{
$filepath = PathManager::getCacheDir($cacheID, $this->cache_dir, $renew_cachedir);
$_cacheFile = $filepath . $cacheID;
if (!is_readable($_cacheFile)) {
return false;
}
// clearstatcache(); //clearn filemtime function cache
if ($this->life_time == 0) {
return true;
}
$now = time();
$fileMTime = filemtime($_cacheFile);
return $now - $fileMTime < $cacheTime;
}