PHP calculate page execution time

microtime = microtime(true); } public function getNow(){ $this->__dectruct(); } public function __destruct(){ if (empty($_SERVER['REQUEST_TIME_FLOAT'])) echo '
本次执行时间：', microtime(TRUE) - $this->microtime, '秒
'; else echo '
本次执行时间：', microtime(TRUE) - $_SERVER['REQUEST_TIME_FLOAT'], '秒
'; } }