PHP 计算页面执行时间

 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 ?>