短URL实现

<?php /**  * Created by PhpStorm.  * User: yangyulong/[email protected]  * Date: 2015/5/28  * Time: 15:55  */ functionshortUrl($url){     $base32=array(         'a','b','c','d','e','f','g','h',         'i','j','k','l','m','n','o','p',         'q','r','s','t','u','v','w','x',         'y','z','0','1','2','3','4','5'     );       $hex= md5($url);     $hexLength=strlen($hex);     $subHexLen=$hexLength/ 8;       $output=array();     for($i= 0;$i<$subHexLen;$i++) {         //每循环一次取到8位         $subHex=substr($hex,$i* 8, 8);         $int= 0x3FFFFFFF & (1 * ('0x'.$subHex));         $out='';           for($j= 0;$j< 6;$j++) {             $val= 0x0000001F &$int;             $out.=$base32[$val];             $int=$int>> 5;         }           $output[] =$out;     }       return$output; }     functionshortUrl2($url){     $result= sprintf("%u",crc32($url));     $show='';     while($result >0){         $s=$result% 62;         if($s> 35){             $s=chr($s+61);         }elseif($s>9 &&$s<=35){             $s=chr($s+55);         }         $show.=$s;         $result=floor($result/ 62);     }       return$show; }   echoshortUrl2('http://baidu.com');