1 < ?php 2 class runtime 3 {  4     var $StartTime = 0;  5     var $StopTime = 0;  6   7     function get_microtime()  8     {  9         list($usec, $sec) = explode(‘ ‘, microtime()); 10         return ((float)$usec + (float)$sec); 11     } 12  13     function start() 14     { 15         $this->StartTime = $this->get_microtime(); 16     } 17  18     function stop() 19     { 20         $this->StopTime = $this->get_microtime(); 21     } 22  23     function spent() 24     { 25         return round(($this->StopTime - $this->StartTime) * 1000, 1); 26     } 27  28 }29  30  31 //例子 32 $runtime= new runtime;33 $runtime->start();34  35 //你的代码开始36  37 $a = 0;38 for($i=0; $i&lt;1000000; $i++)39 {40     $a += $i;41 }42  43 //你的代码结束44  45 $runtime->stop();46 echo "页面执行时间: ".$runtime->spent()." 毫秒";47  48 ?>