测试代码效率

begin($start);
report($start);

1. function begin(&$start) {
2. $tmp = gettimeofday();
3. $start = $tmp[usec];
4. }
6. function report($start) {
7. $tmp = gettimeofday();
8. $now = $tmp[usec];
9. echo "time consuming: ";
10. echo $now - $start;
11. echo "
    ";
12. }
14. function getRandNum($length = 8) {
15. $salt = substr(uniqid(rand()), -$length);
16. return $salt;
17. }
19. $start = 0;
20. begin($start);
21. $str="";
22. while (strlen($str){
23. $str.=getRandNum(1);
24. }
25. report($start);

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