PHP计算程序运行时间的类

<?php

class runTime{

private $starTime;

private $stopTime;

private function getMicTime(){

$mictime=microtime();

list($usec,$sec)=explode(' ',$mictime);

return (float)$usec+(float)$sec;

}

public function star(){

$this->starTime=$this->getMicTime();

}

public function stop(){

$this->stopTime=$this->getMicTime();

}

public function spent(){

return round($this->stopTime-$this->starTime)*1000;//单位：毫秒数

}

}

//类使用方法介绍

$time=new runTime();

$time->star();//该语句尽量写在代码段的最开始处

//程序代码段

$time->stop();//该语句最好写在代码段的最结尾处

echo $time->spent();