dip_bad.php

<?php 

////low Level sınıflarımız
class Email 
{
	function sendEmail();
}

class SMS 
{
	function sendSms();
}


class PushNotification 
{
	function sendPushNotification();
}


///High Level Sınıfımız

class MessageManager
{
	$Email;
	$SMS;
	$PushNotification;
	$type;
	function __construct($type)
	{
		$this->type = $type;
	}	

	public function sendMessage()
	{
		switch ($this->type) 
		{
			case 'email':
				$Email = new Email();
				$Email->sendEmail();
				break;
			case 'SMS':
				$SMS = new SMS();
				$SMS->sendSms();
				break;
			case 'push':
				$PushNotification = new PushNotification();
				$PushNotification->sendPushNotification();
				break;								
			
			default:
				# code...
				break;
		}
	}
}