php记录页面执行时间代码

StartTime = $this->get_microtime(); 
    } 
    function stop() 
    { 
        $this->StopTime = $this->get_microtime(); 
    } 
    function spent() 
    { 
        return round(($this->StopTime - $this->StartTime) * 1000, 1); 
    } 
}
//例子 
$runtime= new runtime;
$runtime->start();
//你的代码开始
$a = 0;
for($i=0; $istop();
echo "页面执行时间: ".$runtime->spent()." 毫秒";
?>