laravel_sketch/app/Base/Utils.php

<?php

namespace App\Base;

class Utils
{
    public static function isDev()
    {
        return app()->environment("local", "qa", "webtest");
    }

    //会员ID中不出现4
    public static function idNo4($id)
    {
        return str_replace("4", "o", $id);
    }
}