php 生成优惠券 带排重方法，欢迎大家拍砖 - 算法与逻辑 - 海诺者 - 海诺博客公告板

/**
     * 生成优惠券数组
     * @param $num
     * @return array
     */
    public function generatorGoodsQuan($num)
    {
        $array = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
            'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
            'T', 'U', 'V', 'W', 'X', 'Y', 'Z');
        for ($i = 0; $i < $num; $i++) {
            $randChar = array_rand($array, 1);
            $quan[] = uniqid($array[$randChar]);
        }
        return $quan;
    }
    /**
     * 优惠券数组排重
     *
     * @param $quan
     * @param $num
     * @return mixed
     */
    private function checkUniQuan($quan, $num)
    {
        $quan = array_unique($quan);
        if (count($quan) < $num) {
            $quan = array_merge($quan, $this->generatorGoodsQuan($num - count($quan)));
            return $this->checkUniQuan($quan, $num);
        } else
            return $quan;
    }
    /**
     * 数据库排重
     * @param $shopId
     * @param $goodsId
     * @param $quan
     * @param $num
     * @return array|mixed
     */
    private function checkDatabaseQuan($shopId, $goodsId, $quan, $num)
    {
        $data=M("UserQuans")->where(array(
            'shopId'=>$shopId,
            'goodsid'=>$goodsId,
            'quan'=>array('in',$quan)
        ))->getField('quan',true);
        if(empty($data))
            return $quan;
        else{
            $quan=array_diff($quan,$data);
            $quan = array_merge($quan, $this->generatorGoodsQuan($num - count($quan)));
            $quan=$this->checkUniQuan($quan,$num);
            return $this->checkDatabaseQuan($shopId, $goodsId, $quan, $num);
        }
    }
    /**
     * 集合方法 生成针对某个店铺，某个商品的一定数量的优惠券
     * @param $shopId
     * @param $goodsId
     * @param $num
     * @return array|mixed
     */
    public function getQuanSn($shopId, $goodsId, $num)
    {
        $quan = $this->generatorGoodsQuan($num);
        $quan = $this->checkUniQuan($quan,  $num);
        return $this->checkDatabaseQuan($shopId, $goodsId, $quan, $num);
    }

如上是最新写的一个优惠券生成方法，欢迎大家拍砖 交流意见