1、不同应用

<?php

namespace app\api\controller;
use app\home\controller\userInfo;

class user extends BaseController {
    function inndex(){
        $user = new userInfo($this->app);
        $user->getUser();
    }

2、同应用

<?php

namespace app\api\controller;

class user extends BaseController {
    function inndex(){
        $user = new userInfo($this->app); /* app\api\controller\userInfo */
        $user->getUser();
    }