自己写的一个简单的容器按需加载例子

<?php

class Di {
    protected $providers = [];

    //注册服务
    public function register($id,$val) {
        $this->providers[$id] = function () use ($val){
            return new $val();
        };
    }

    //get方法
    public function __get($id) {
        return $this->providers[$id]();
    }
}

class User{
    public function test() {
        echo 'user:test';
    }
}

class Student{
    public function test() {
        echo 'student:test';
    }
}

$di = new Di();

$di->register('user',User::class);
$di->register('student',Student::class);

$di->user->test()."/r/n";

$di->student->test();