pet/application/service/pay_user/PayUser.php

<?php
namespace app\service\pay_user;

use app\common\model\User;

abstract class PayUser{
    protected static $types=[
        1=>PayUserMoney::class,
        2=>PayUserWechat::class,
    ];
    protected static $type;

    /**
     * @return mixed
     */
    public static function getType()
    {
        return self::$type;
    }

    /**
     * @param mixed $type
     */
    public static function setType($type): void
    {
        if(!$type){
            $type=1;
        }
        self::$type = $type;
    }

    /**
     * @return self
     */
    public static function getClass(){
        static $class;
        if(!$class){
            $class=new self::$types[self::$type];
        }
        return $class;
    }

    abstract function payment($amount,User $user,$type,$memo,$extra=[]);
}