装饰器模式

<?php
 
interface Notifier {
    public function send(string $message);
}
 
class BasicNotifier implements Notifier {
    public function send(string $message) {
        echo "Sending notification: $message\n";
    }
}
 
// 装饰器基类
class NotifierDecorator implements Notifier {
    protected $wrapped;
 
    public function __construct(Notifier $notifier) {
        $this->wrapped = $notifier;
    }
 
    public function send(string $message) {
        $this->wrapped->send($message);
    }
}
 
// 具体的装饰器
class SMSNotifier extends NotifierDecorator {
    public function send(string $message) {
        parent::send($message);
        echo "Sending SMS: $message\n";
    }
}
 
class EmailNotifier extends NotifierDecorator {
    public function send(string $message) {
        parent::send($message);
        echo "Sending Email: $message\n";
    }
}
 
// 使用装饰器模式
$notifier = new BasicNotifier();
$smsNotifier = new SMSNotifier($notifier);
$emailNotifier = new EmailNotifier($smsNotifier);
 
$emailNotifier->send("Hello, World!");