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<?php interface Mediator { public function setUser(User $user); public function send($message, User $sendUser, User $receiveUser=null); } abstract class User { protected $mediator = null; public function setMediator(Mediator $mediator) { $mediator->setUser($this); $this->mediator = $mediator; } abstract public function send($message, User $receiveUser=null); } class QQMediator implements Mediator { private $users = array(); public function setUser(User $user) { $this->users[]=$user; } public function send($message, User $sendUser, User $receiveUser=null) { foreach ($this->users as $user) { if ($user === $sendUser) { continue; } if ($receiveUser !== null && $receiveUser !== $user) { continue; } echo $user->name . '接收到了来自' . $sendUser->name . '的信息：' . $message . '<br>'; } } } class User1 extends User { public $name = '用户1'; public function send($message, User $receiveUser=null) { $this->mediator->send($message, $this, $receiveUser); } } class User2 extends User { public $name = '用户2'; public function send($message, User $receiveUser=null) { $this->mediator->send($message, $this, $receiveUser); } } class User3 extends User { public $name = '用户3'; public function send($message, User $receiveUser=null) { $this->mediator->send($message, $this, $receiveUser); } } $mediator = new QQMediator(); $user1 = new User1(); $user1->setMediator($mediator); $user2 = new User2(); $user2->setMediator($mediator); $user3 = new User3(); $user3->setMediator($mediator); echo '群发：<br>'; $user1->send('你们好啊'); echo '<br>单发：<br>'; $user2->send('你好用户3', $user3); |
