如何用PHP准确测量页面执行耗时？

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php

public function __construct() { $this->microtime=microtime(true); }

public function getNow() { $this->__destruct(); }

public function __destruct() { if (empty($_SERVER)) }?>

<?php $t = new executeTime; phpinfo(); class executeTime{ private $microtime; public function __construct(){ $this->microtime = microtime(true); } public function getNow(){ $this->__dectruct(); } public function __destruct(){ if (empty($_SERVER['REQUEST_TIME_FLOAT'])) echo '<div style="color:#fff;background:#000;position:absolute;top:0px;right:0px;padding:3px 6px;">本次执行时间：', microtime(TRUE) - $this->microtime, '秒</div>'; else echo '<div style="color:#fff;background:#000;position:absolute;top:0px;right:0px;padding:3px 6px;">本次执行时间：', microtime(TRUE) - $_SERVER['REQUEST_TIME_FLOAT'], '秒</div>'; } }