PHP 计算页面执行时间的方法

< ?php<br />class runtime<br />{ <br />    var $StartTime = 0; <br />    var $StopTime = 0; <br /> <br />    function get_microtime() <br />    { <br />        list($usec, $sec) = explode(' ', microtime()); <br />        return ((float)$usec + (float)$sec); <br />    } <br /> <br />    function start() <br />    { <br />        $this->StartTime = $this->get_microtime(); <br />    } <br /> <br />    function stop() <br />    { <br />        $this->StopTime = $this->get_microtime(); <br />    } <br /> <br />    function spent() <br />    { <br />        return round(($this->StopTime - $this->StartTime) * 1000, 1); <br />    } <br /> <br />}

<?php</p><p>$runtime= new runtime;<br />$runtime->start();<br /> <br />//你的代码开始<br /> <br />$a = 0;<br />for($i=0; $i<1000000; $i++)<br />{<br />    $a += $i;<br />}<br /> <br />//你的代码结束<br /> <br />$runtime->stop();<br />echo "页面执行时间: ".$runtime->spent()." 毫秒";<br /> <br />?>