<?
class timer {
var $starttime = 0;
var $stoptime = 0;
var $timespent = 0;

function start(){
$this->starttime = microtime();
}

function stop(){
$this->stoptime = microtime();
}

function spent() {
if ($this->timespent) {
return $this->timespent;
} else {
$startmicro = substr($this->starttime,0,10);
$startsecond = substr($this->starttime,11,10);
$stopmicro = substr($this->stoptime,0,10);
$stopsecond = substr($this->stoptime,11,10);
$start = doubleval($startmicro) + $startsecond;
$stop = doubleval($stopmicro) + $stopsecond;
$this->timespent = $stop - $start;
return substr($this->timespent,0,8)."秒";
}
} // end function spent();

} //end class timer;

//例子：
$timer = new timer;
$timer->start();
/*
你的代码放在此处
*/

$timer->stop();
echo "执行本script共".$timer->spent();
?>

　　

在google里搜索更多这有一个测试页面执行时间的类

	Web www.51ec.org

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