php生成短网址

<?php /\*\*  \* Created by PhpStorm.  \* User: yangyulong/anziguoer@sina.com  \* Date: 2015/5/28  \* Time: 15:55  \*/ function shortUrl($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 $output; }     function shortUrl2($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; }   echo shortUrl2('http://www.baidu.com');