复制代码 代码如下: 
class timer { 
private $starttime = 0;//程序运行开始时间 
private $stoptime = 0;//程序运行结束时间 
private $timespent = 0;//程序运行花费时间 
function start(){//程序运行开始 
$this->starttime = microtime(); 
} 
function stop(){//程序运行结束 
$this->stoptime = microtime(); 
} 
function spent(){//程序运行花费的时间 
if ($this->timespent) { 
return $this->timespent; 
} else { 
list($startmicro, $startsecond) = explode( , $this->starttime); 
list($stopmicro, $stopsecond) = explode( , $this->stoptime); 
$start = doubleval($startmicro) + $startsecond; 
$stop = doubleval($stopmicro) + $stopsecond; 
$this->timespent = $stop - $start; 
return substr($this->timespent,0,8).秒;//返回获取到的程序运行时间差 
} 
} 
} 
$timer = new timer(); 
$timer->start(); 
//...程序运行的代码 
$timer->stop(); 
echo 程序运行时间为:.$timer->spent();