php生成短网址的简单代码

* php短网址生成* edit: bbs.it-home.org*/class Base62{ private static $base62 = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; public static function encode($number, $encode = ''){ while($number > 0){ $mod = bcmod($number, 62); $encode .= self::$base62[$mod]; $number = bcdiv(bcsub($number, $mod), 62); } return strrev($encode); } public static function decode($encode, $number = 0){ $length = strlen($encode); $baselist = array_flip(str_split(self::$base62)); for($i = 0; $i $number = bcadd($number, bcmul($baselist[$encode[$i]], bcpow(62, $length - $i - 1))); } return $number; } }复制代码