PHP计算页面程序执行时间实例代码

class runtime
{
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);
}
}

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