PHP 计算页面执行时间

代码] [PHP]代码

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<?php

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$t = new executeTime;

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phpinfo();

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class executeTime{

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    private $microtime;

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    public function __construct(){

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        $this->microtime = microtime(true);

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    }

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        public function getNow(){

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                $this->__dectruct();

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        }

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    public function __destruct(){

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        if (empty($_SERVER['REQUEST_TIME_FLOAT']))

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            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>';

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        else

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            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>';

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    }

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}