/**     * 对用户的密码进行加密     * @param $password     * @param $encrypt //传入加密串，在修改密码时做认证     * @return array/password     */    function password($password, $encrypt='') {        $pwd = array();        $pwd['encrypt'] =  $encrypt ? $encrypt : create_randomstr();         $pwd['password'] = md5(md5(trim($password)).$pwd['encrypt']);        return $encrypt ? $pwd['password'] : $pwd;    }    /**     * 生成随机字符串     * @param string $lenth 长度     * @return string 字符串     */    function create_randomstr($lenth = 6) {        return random($lenth, '123456789abcdefghijklmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ');    }