php生成短网址的简单代码

2. /*
3. * php短网址生成
4. * edit: bbs.it-home.org
5. */
6. class Base62{
7. private static $base62 = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
9. public static function encode($number, $encode = ''){
10. while($number > 0){
11. $mod = bcmod($number, 62);
12. $encode .= self::$base62[$mod];
13. $number = bcdiv(bcsub($number, $mod), 62);
15. }
16. return strrev($encode);
17. }
19. public static function decode($encode, $number = 0){
20. $length = strlen($encode);
21. $baselist = array_flip(str_split(self::$base62));
22. for($i = 0; $i $number = bcadd($number, bcmul($baselist[$encode[$i]], bcpow(62, $length - $i - 1)));
23. }
24. return $number;
25. }
26. }

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