instanceof在PHP對(duì)象中介者模式中的類型協(xié)調(diào)

在PHP對(duì)象中介者模式中，可以使用instanceof關(guān)鍵字來(lái)判斷對(duì)象的類型，以便進(jìn)行類型協(xié)調(diào)。對(duì)象中介者模式通常涉及多個(gè)對(duì)象之間的交互，其中中介者對(duì)象負(fù)責(zé)協(xié)調(diào)這些對(duì)象之間的通信和交互。

通過(guò)使用instanceof關(guān)鍵字，可以在中介者對(duì)象中檢查傳入的對(duì)象的類型，并相應(yīng)地執(zhí)行邏輯。例如，如果中介者對(duì)象需要與不同類型的對(duì)象進(jìn)行交互，可以使用instanceof來(lái)判斷對(duì)象的類型，然后調(diào)用相應(yīng)的方法或執(zhí)行不同的邏輯。

以下是一個(gè)簡(jiǎn)單的示例，演示如何在PHP對(duì)象中介者模式中使用instanceof進(jìn)行類型協(xié)調(diào)：

interface Colleague {
    public function sendMessage($message);
}

class ConcreteColleague1 implements Colleague {
    public function sendMessage($message) {
        echo "Concrete Colleague 1 sends message: $message\n";
    }
}

class ConcreteColleague2 implements Colleague {
    public function sendMessage($message) {
        echo "Concrete Colleague 2 sends message: $message\n";
    }
}

class ConcreteMediator {
    public function sendMessageToColleague($colleague, $message) {
        if ($colleague instanceof Colleague) {
            $colleague->sendMessage($message);
        } else {
            echo "Invalid colleague type\n";
        }
    }
}

// Usage
$colleague1 = new ConcreteColleague1();
$colleague2 = new ConcreteColleague2();
$mediator = new ConcreteMediator();

$mediator->sendMessageToColleague($colleague1, "Hello from Colleague 1");
$mediator->sendMessageToColleague($colleague2, "Hello from Colleague 2");
$mediator->sendMessageToColleague("Invalid Colleague", "Hello");

在上面的示例中，ConcreteMediator類中的sendMessageToColleague方法使用instanceof關(guān)鍵字來(lái)檢查傳入的對(duì)象是否實(shí)現(xiàn)了Colleague接口。如果是，則調(diào)用sendMessage方法發(fā)送消息，否則輸出"Invalid colleague type"。這種類型協(xié)調(diào)可以幫助確保中介者對(duì)象與不同類型的對(duì)象進(jìn)行交互時(shí)的正確性。