php 生成卡密 不重复

public function add()
    {
        if (false === $this->request->isPost()) {
            return $this->view->fetch();
        }
        $params = $this->request->post('row/a');
        if (empty($params)) {
            $this->error(__('Parameter %s can not be empty', ''));
        }
        $num = $params['num'];
        if (!is_numeric($num)) {
            # 请输入数字
            $this->error('请输入数字');
        }
        if ($num <= 0) {
            # 数量必须大于0
            $this->error('数量必须大于0');
        }
        if ($num > 1000){
            $this->error('一次批量生成1000条');
        }
        $cardLog  = Db::name('card_log')->order("card DESC")->find();
        if ($cardLog){
            $startNumber = $cardLog['card'] + 1; // 起始数字
        }else{
            $startNumber = 10000000; // 起始数字
        }
        $increment = 1; //增量
        $numbersBatch = $this->generateUniqueNumbers($startNumber, $increment, $num);
        foreach ($numbersBatch as $v){
            $data[] = [
                'name' => $v,
                'key' => getCardKey(),
                'status' => 1,
                'createtime' => time(),
            ];
        }
        $this->model->insertAll($data);
        Db::name('card_log')->insert(['card' => $data[count($data)-1]['name'],'createtime' => time()]);
        $this->success("成功");
    }

    function generateUniqueNumbers($startNumber, $increment, $count) {
        $uniqueNumbers = array();
        for ($i = 0; $i < $count; $i++) {
            $number = $startNumber + $i * $increment;
            $uniqueNumbers[] = str_pad($number, 8, '0', STR_PAD_LEFT);
        }
        return $uniqueNumbers;
    }

例如:10000001,10000002,10000003