研究PHP面向对象编程中的中介者模式

// 定义聊天室中的用户类
class User
{
    private $name;
    private $chatroom;

    public function __construct($name, Chatroom $chatroom)
    {
        $this->name = $name;
        $this->chatroom = $chatroom;
    }

    public function getName()
    {
        return $this->name;
    }

    public function sendMessage($message)
    {
        $this->chatroom->sendMessage($this, $message);
    }

    public function receiveMessage($message)
    {
        echo $this->name . ' received message: ' . $message . PHP_EOL;
    }
}

// 定义中介者类
class Chatroom
{
    public function sendMessage(User $user, $message)
    {
        foreach ($users as $user) {
            if ($user != $sender) {
                $user->receiveMessage($message);
            }
        }
    }
}

// 创建用户及聊天室对象
$chatroom = new Chatroom();

$user1 = new User('User1', $chatroom);
$user2 = new User('User2', $chatroom);
$user3 = new User('User3', $chatroom);

// 用户发送消息
$user1->sendMessage('Hello, everyone!');