php（计算程序执行时间）

?php
class timer
{
    var $StartTime = 0;
    var $StopTime = 0;

    function get_microtime()
    {
        list($usec, $sec) = explode(' ', microtime());
        return ((float)$usec + (float)$sec);
    }

    function start()
    {
        $this->StartTime = $this->get_microtime();
    }

    function stop()
    {
        $this->StopTime = $this->get_microtime();
    }

    function spent()
    {
        return round(($this->StopTime - $this->StartTime) * 1000, 1);
    }

}

/*
//例子
$timer = new timer;
$timer->start();

//你的代码开始

$a = 0;
for($i=0; $istop();
echo "页面执行时间: ".$timer->spent()." 毫秒";
*/
?>