随机密码

/**     * 生成随机密码     * @author Leven <[e-mail]>     * @return string     */    function createRegPwd()    {        $str = '';        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";        $max = strlen($strPol) - 1;        for ($i = 0; $i < 8; $i ++) {            $str .= $strPol{rand(0, $max)};        }        return $str;    }