<?php namespace Api\Lib;
use Dever;
class Util
{
    # 生成订单号
    public function createNumber($prefix, $table)
    {
        $number = \Dever\Helper\Str::order($prefix);
        $state = Dever::db($table)->find(array('number' => $number));
        if (!$state) {
            return $number;
        } else {
            return $this->createNumber($prefix, $table);
        }
    }

    # 获取openid
    
}