請(qǐng)問錯(cuò)哪里了呢

和老師的代碼一模一樣的，

我復(fù)制下代碼

<?php

namespace app\controllers;

use yii\base\Controller;

use yii\di\Container;

class DependencyController extends Controller{

public function actionIndex(){

$container = new Container;

$container->set('app\Controllers\Driver','app\Controllers\ManDriver');

$car = $container->get('app\Controllers\Car'); ? ? ?//因?yàn)樯厦嬉呀?jīng)指定了命名空間，所有的話這也要加上命名空間

//上面這個(gè)get方法實(shí)際上做了兩件事如下注釋的兩件事，就是如果下面的car中的__construct()有傳遞ManDriver對(duì)象的情況下

// $driver = new ManDriver; ? //第一步是先實(shí)例化ManDriver

// $car = new Car($driver); ? //第二部是實(shí)例化Car對(duì)象

$car->run();

}

}

interface Driver{

public function drive();

}

class ManDriver implements Driver{ ? ? ?//繼承Driver接口，目的是為了解決強(qiáng)關(guān)聯(lián)

public function drive(){

echo "i am an old man!";

}

}

class Car{

private $driver = null;

public function __construct(Driver $driver){ ? ?//通過構(gòu)造來傳遞司機(jī)對(duì)象,如果加了ManDriver對(duì)象實(shí)例這樣傳遞會(huì)造成強(qiáng)關(guān)聯(lián)

$this->driver = $driver;

}

public function run(){

$this->driver->drive();

}

}