php生成短网址

> 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://baidu.com');