php计算页面执行时间代码

3. class c_Timer {
4. var $t_start = 0;
5. var $t_stop = 0;
6. var $t_elapsed = 0;
8. function start() { $this->t_start = microtime(); }
10. function stop() { $this->t_stop = microtime(); }
12. function elapsed() {
13. if ($this->t_elapsed) {
14. return $this->t_elapsed;
15. } else {
16. $start_u = substr($this->t_start,0,10);
17. $start_s = substr($this->t_start,11,10);
18. $stop_u = substr($this->t_stop,0,10);
19. $stop_s = substr($this->t_stop,11,10);
20. $start_total = doubleval($start_u) + $start_s;
21. $stop_total = doubleval($stop_u) + $stop_s;
23. $this->t_elapsed = $stop_total - $start_total;
25. return $this->t_elapsed;
26. }
27. }
28. };
30. /* Here's an example usage:
32. $timer = new c_Timer;
34. $timer->start();
35. echo "

    ---

    ";
36. $timer->stop();
38. echo $timer->elapsed();
40. */
41. ?>

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执行时间, php