php產生五位元邀請碼

本篇文章給大家分享的內容是php產生五位元邀請碼，有著一定的參考價值，有需要的朋友可以參考一下

model

 /**     * 產生邀請碼     * @param $uid     * @return string     */public function initcode() {        $code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';        $rand = $code[rand(0,25)]            .strtoupper(dechex(date('m')))            .date('d').substr(time(),-5)            .substr(microtime(),2,5)            .sprintf('%02d',rand(0,99));        for(            $a = md5( $rand, true ),            $s = '0123456789ABCDEFGHIJKLMNOPQRSTUV',            $d = '',            $f = 0;            $f < 5;            $g = ord( $a[ $f ] ),            $d .= $s[ ( $g ^ ord( $a[ $f + 8 ] ) ) - $g & 0x1F ],            $f++        );        return $d;    }    /**     * 是否重複     */    public function recode($code) {        if ($this->where('code='.$code)->find()) {            return false;        }        return true;    }

action

/**     * 我的邀請碼     * @author zhangfeng     */    public function mycode() {        $model = M('Usercode');        $uid = ($_GET['uid']);        $code = $model->is_code($uid);        $this->assign('code', $code);        if (!$code) {            $code = $this->getcode($model, $uid);            $res = $model->savecode($uid, $code);            if ($res) {                $this->assign('code', $code);            } else {                $this->assign('code', '邀請碼產生失敗！，錯誤：'.$model->getError());            }        }        $this->display();    }    /**     * 遞迴函式擷取絕對不重複邀請碼     * @author zhangfeng     * @param $model     * @param $uid     * @return mixed     */    private function getcode($model, $uid) {        $code = $model->initcode($uid);        if ($model->recode($code)) {            return $code;        } else {            while(true) {                $this->getcode($model, $uid);            }        }    }