youxiangjie/application/api/model/UsersModel.php

<?php
namespace app\api\model;
use think\Model;

class UsersModel extends Model
{
    protected $name = "Users";

    protected $rules = [
        'user_id' => 'require|number',
        'user_nickname' => 'require',
        'idcard' => 'require',
    ];

    /**
     * 检查用户是否存在
     * @param $userId
     * @return bool
     * @throws \think\exception\DbException
     */
    public static function checkUserExist($userId)
    {
        $user = self::get($userId);
        if (!empty($user)) {
            return true;
        }
        return false;
    }
}