php生成短网址仿微博短网址生成代码

2，生成php短网址的代码。

2. header("Content-Type:text/html;charset=UTF-8");
3. function base62($x){
4. $show = '';
5. while($x>0){
6. $s = $x % 62;
7. if ($s > 35){
8. $s = chr($s + 61);
9. }else if ($s > 5 && $S<=35){
10. $s = chr($s + 55);
11. }
12. $show .= $s;
13. $x = floor($x/62);
14. }
15. return $show;
16. }
18. function url_short($url){
19. $url = crc32($url);
20. $result = sprintf("%u",$url);
21. return base62($result);
22. }
24. echo ("生成的短网址为：".url_short($_POST['url'])."");