Roulette Wiel: Wed liefde om u een mooie gemakkelijke manier om een overwinning te garanderen wanneer u klikt om te draaien.
  • Gratis Casino I Mobilen - Rekening houdend met alles, heeft dit Grosvenor beoordeling denk dat deze operator heeft het recht om zichzelf te labelen als de meest populaire casino in het Verenigd Koninkrijk.
  • Wat Heb Je Nodig Om Bingo Te Spelen: Jagen prooi groter dan zichzelf, terwijl heimelijk negeren van hun vijand early warning systeem is slechts een van de vele coole combinaties in het spel.

    • Winkans bij loterijen

    Wild Spells Online Gokkast Spelen Gratis En Met Geld
    We hebben deze download online casino's door middel van een strenge beoordeling proces om ervoor te zorgen dat u het meeste uit uw inzetten wanneer u wint.
    Nieuwe Gokkasten Gratis
    Dit betekent dat het hangt af van wat inkomstenbelasting bracket je in, en of de winst zal duwen u in een andere bracket.
    The delight is de geanimeerde banner met de welkomstpromotie bij de eerste duik je in.

    Pokersites voor Enschedeers

    Nieuw Casino
    De reel set is 7x7, met een totaal van 49 symbolen in het spel.
    Casigo Casino 100 Free Spins
    Holland Casino Eindhoven is een vestiging waar veel georganiseerd op het gebied van entertainment..
    Casino Spel Gratis Slots

    PHP hook, building hooks in your application

    By /

    Introduction
    One of the real challenges in building any type of framework, core or application is making it possible for the developers to hook into the business logic at specific points. Since PHP is not event based, nor it works with interrupts you have to come up an alternative.

    The test case
    Lets assume we are the main developers of a webshop framework. Programmers can use our framework to build complete webshops. Programmers can manage the orders that are placed on the webshop with the order class. The order class is part of our framework and we don’t want it to be extended by any programmer. However we don’t want to limit to programmers in their possibilities to hook into the orders process.

    For example programmers should be able to send an email to the webshopowner if an order changes from one specific delivery status to another. This functionality is not part of the default behavior in our framework and is custom for the progammers webshop implementation.

    Like said before, PHP doesn’t provide interrupts or real events so we need to come up with another way to implement hooks into our application. Lets take a look at the observer pattern.

    Implementing the Observer pattern
    The observer pattern is a design-pattern that describes a way for objects to be notified to specific state-changes in objects of the application.

    For the first implementation we can use SPL. The SPL provides in two simple objects:

    SPLSubject

    • attach (new observer to attach)
    • detach (existing observer to detach)
    • notify (notify all observers)

    SPLObserver

    • update (Called from the subject (i.e. when it’s value has changed).
    iOrderRef = $iOrderRef;
		
		// Get order information from the database or an other resources
		$this->iStatus = Order::STATUS_SHIPPED;
	}
	
	/**
	 * Attach an observer
	 * 
	 * @param SplObserver $oObserver 
	 * @return void
	 */
	public function attach(SplObserver $oObserver)
	{
		$sHash = spl_object_hash($oObserver);
		if (isset($this->aObservers[$sHash])) {
			throw new Exception('Observer is already attached');
		}

		$this->aObservers[$sHash] = $oObserver;
	}

	/**
	 * Detach observer
	 * 
	 * @param SplObserver $oObserver 
	 * @return void
	 */
	public function detach(SplObserver $oObserver)
	{
		$sHash = spl_object_hash($oObserver);
		if (!isset($this->aObservers[$sHash])) {
			throw new Exception('Observer not attached');
		}
		unset($this->aObservers[$sHash]);
	}

	/**
	 * Notify the attached observers
	 * 
	 * @param string $sEvent, name of the event
	 * @param mixed $mData, optional data that is not directly available for the observers
	 * @return void
	 */
	public function notify()
	{
		foreach ($this->aObservers as $oObserver) {
			try {
				$oObserver->update($this);
			} catch(Exception $e) {

			}
		}
	}

	/**
	 * Add an order
	 * 
	 * @param array $aOrder 
	 * @return void
	 */
	public function delete()
	{
		$this->notify();
	}
	
	/**
	 * Return the order reference number
	 * 
	 * @return int
	 */
	public function getRef()
	{
		return $this->iOrderRef;
	}
	
	/**
	 * Return the current order status
	 * 
	 * @return int
	 */
	public function getStatus()
	{
		return $this->iStatus;
	}
	
	/**
	 * Update the order status
	 */
	public function updateStatus($iStatus)
	{
		$this->notify();
		// ...
		$this->iStatus = $iStatus;
		// ...
		$this->notify();
	}
}

/**
 * Order status handler, observer that sends an email to secretary
 * if the status of an order changes from shipped to delivered, so the
 * secratary can make a phone call to our customer to ask for his opinion about the service
 * 
 * @package Shop
 */
class OrderStatusHandler implements SplObserver
{
	/**
	 * Previous orderstatus
	 * @var int
	 */
	protected $iPreviousOrderStatus;
	/**
	 * Current orderstatus
	 * @var int
	 */
	protected $iCurrentOrderStatus;
	
	/**
	 * Update, called by the observable object order
	 * 
	 * @param Observable_Interface $oSubject
	 * @param string $sEvent
	 * @param mixed $mData 
	 * @return void
	 */
	public function update(SplSubject $oSubject)
	{
		if(!$oSubject instanceof Order) {
			return;
		}
		if(is_null($this->iPreviousOrderStatus)) {
			$this->iPreviousOrderStatus = $oSubject->getStatus();
		} else {
			$this->iCurrentOrderStatus = $oSubject->getStatus();
			if($this->iPreviousOrderStatus === Order::STATUS_SHIPPED && $this->iCurrentOrderStatus === Order::STATUS_DELIVERED) {
				$sSubject = sprintf('Order number %d is shipped', $oSubject->getRef());
				//mail('secratary@example.com', 'Order number %d is shipped', 'Text');
				echo 'Mail sended to the secratary to help her remember to call our customer for a survey.';
			}
		}
	}
}

$oOrder = new Order(26012011);
$oOrder->attach(new OrderStatusHandler());
$oOrder->updateStatus(Order::STATUS_DELIVERED);
$oOrder->delete();
?>

    There are several problems with the implementation above. To most important disadvantage is that we have only one update method in our observer. In this update method we don’t know when and why we are getting notified, just that something happened. We should keep track of everything that happens in the subject. (Or use debug_backtrace… just joking, don’t even think about using it that way ever!).

    Taking it a step further, events
    Lets take a look at the next example, we will extend the Observer implementation with some an additional parameter for the eventname that occured.

    Finishing up, optional data

    iOrderRef = $iOrderRef;
		
		// Get order information from the database or something else...
		$this->iStatus = Order::STATUS_SHIPPED;
	}
	
	/**
	 * Attach an observer
	 * 
	 * @param Observer_Interface $oObserver 
	 * @return void
	 */
	public function attachObserver(Observer_Interface $oObserver)
	{
		$sHash = spl_object_hash($oObserver);
		if (isset($this->aObservers[$sHash])) {
			throw new Exception('Observer is already attached');
		}

		$this->aObservers[$sHash] = $oObserver;
	}

	/**
	 * Detach observer
	 * 
	 * @param Observer_Interface $oObserver 
	 * @return void
	 */
	public function detachObserver(Observer_Interface $oObserver)
	{
		$sHash = spl_object_hash($oObserver);
		if (!isset($this->aObservers[$sHash])) {
			throw new Exception('Observer not attached');
		}
		unset($this->aObservers[$sHash]);
	}

	/**
	 * Notify the attached observers
	 * 
	 * @param string $sEvent, name of the event
	 * @param mixed $mData, optional data that is not directly available for the observers
	 * @return void
	 */
	public function notifyObserver($sEvent, $mData=null)
	{
		foreach ($this->aObservers as $oObserver) {
			try {
				$oObserver->update($this, $sEvent, $mData);
			} catch(Exception $e) {

			}
		}
	}

	/**
	 * Add an order
	 * 
	 * @param array $aOrder 
	 * @return void
	 */
	public function add($aOrder = array())
	{
		$this->notifyObserver('onAdd');
	}
	
	/**
	 * Return the order reference number
	 * 
	 * @return int
	 */
	public function getRef()
	{
		return $this->iOrderRef;
	}
	
	/**
	 * Return the current order status
	 * 
	 * @return int
	 */
	public function getStatus()
	{
		return $this->iStatus;
	}
	
	/**
	 * Update the order status
	 */
	public function updateStatus($iStatus)
	{
		$this->notifyObserver('onBeforeUpdateStatus');
		// ...
		$this->iStatus = $iStatus;
		// ...
		$this->notifyObserver('onAfterUpdateStatus');
	}
}

/**
 * Order status handler, observer that sends an email to secretary
 * if the status of an order changes from shipped to delivered, so the
 * secratary can make a phone call to our customer to ask for his opinion about the service
 * 
 * @package Shop
 */
class OrderStatusHandler implements Observer_Interface
{
	protected $iPreviousOrderStatus;
	protected $iCurrentOrderStatus;
	
	/**
	 * Update, called by the observable object order
	 * 
	 * @param Observable_Interface $oObservable
	 * @param string $sEvent
	 * @param mixed $mData 
	 * @return void
	 */
	public function update(Observable_Interface $oObservable, $sEvent, $mData=null)
	{
		if(!$oObservable instanceof Order) {
			return;
		}
		
		switch($sEvent) {
			case 'onBeforeUpdateStatus':
				$this->iPreviousOrderStatus = $oObservable->getStatus();
				return;
			case 'onAfterUpdateStatus':
				$this->iCurrentOrderStatus = $oObservable->getStatus();
				
				if($this->iPreviousOrderStatus === Order::STATUS_SHIPPED && $this->iCurrentOrderStatus === Order::STATUS_DELIVERED) {
					$sSubject = sprintf('Order number %d is shipped', $oObservable->getRef());
					//mail('secratary@example.com', 'Order number %d is shipped', 'Text');
					echo 'Mail sended to the secratary to help her remember to call our customer for a survey.';
				}
		}
	}
}

$oOrder = new Order(26012011);
$oOrder->attachObserver(new OrderStatusHandler());
$oOrder->updateStatus(Order::STATUS_DELIVERED);
$oOrder->add();
?>

    Now we are able to take action on different events that occur.

    Disadvantages
    Although this implementation works quite well there are some drawbacks. One of those drawbacks is that we need to dispatch an event in our framework, if we don’t programmers can’t hook into our application. Triggering events everywhere give us a small performance penalty however I do think this way of working gives the programmers a nice way to hook into your application on those spots that you want them to hook in.

    Just for the record
    Notice that this code is just an example and can still use some improvements, for example: each observer is initialized even it will maybe never be notified, therefore I suggest to make use of lazy in some cases for loading the objects. There are other systems to hook into an application, more to follow!

    11,861 thoughts on “PHP hook, building hooks in your application”

    1. AngelaCep

      Покупка дипломов ВУЗов по всей России и СНГ — с печатями, подписями, приложением и возможностью архивной записи (по запросу).
      Документ максимально приближен к оригиналу и проходит визуальную проверку.
      Мы даем гарантию, что в случае проверки документа, подозрений не возникнет.

      – Конфиденциально
      – Доставка 3–7 дней
      – Любая специальность

      Уже более 4688 клиентов воспользовались услугой — теперь ваша очередь.

      По ссылке — ответим быстро, без лишних формальностей.

    2. AngelJex

      аккаунты варфейс купить Желание ворваться в динамичный мир Warface, облаченным в крутую броню и с арсеналом новейшего оружия, вполне понятно. Покупка игры – это ваш пропуск в захватывающие PvP-сражения и кооперативные миссии, где командная работа и тактическое мышление – залог победы. Аккаунт Варфейс

    5. real money online casinos

      I do not know if it’s just me or if perhaps everybody
      else encountering issues with your website.
      It appears like some of the text in your posts are running
      off the screen. Can somebody else please provide feedback and let me know if this is happening to them too?
      This could be a issue with my web browser because I’ve had this happen previously.
      Thanks

    6. AngelaCep

      Оформиление дипломов ВУЗов по всей России и СНГ — с печатями, подписями, приложением и возможностью архивной записи (по запросу).
      Документ максимально приближен к оригиналу и проходит визуальную проверку.
      Мы гарантируем, что в случае проверки документа, подозрений не возникнет.

      – Конфиденциально
      – Доставка 3–7 дней
      – Любая специальность

      Уже более 923 клиентов воспользовались услугой — теперь ваша очередь.

      [url=http://spbrcom9.ru/]На сайте[/url] — ответим быстро, без лишних формальностей.

    9. stroitelnoe vodoponijenie_dsKi

      смета на водопонижение иглофильтрами [url=http://aktivnoe.forum24.ru/?1-9-0-00001177-000-0-0-1750678964]смета на водопонижение иглофильтрами[/url] .

    11. beta138

      I every time used to read paragraph in news papers but now as I am a user of net thus
      from now I am using net for content, thanks to web.

    12. bokep indo colmek viral terbaru

      Good day! I know this is kinda off topic but I’d figured I’d
      ask. Would you be interested in exchanging links or maybe guest authoring a blog post
      or vice-versa? My site goes over a lot of the same topics as yours and I believe
      we could greatly benefit from each other. If you’re interested feel free to send me an email.
      I look forward to hearing from you! Wonderful blog by the way!

    14. NexironTrader 2.1 Flex

      of course like your web-site however you have to check the
      spelling on several of your posts. Several of them are rife with spelling problems and I find it very bothersome to inform the truth nevertheless I
      will certainly come back again.

    15. Value For Money

      I have been browsing on-line greater than 3 hours these days, yet I by no means
      discovered any interesting article like yours.
      It is pretty price sufficient for me. In my view, if all webmasters and bloggers
      made just right content as you probably did, the web will probably be
      a lot more useful than ever before.

    17. AntoineBep

      Бездепозитный бонус в казино Бездепозитные бонусы – это магнит для новых игроков в онлайн-казино, словно обещанный клад на необитаемом острове азарта. Они позволяют сделать первые шаги, не рискуя собственным кошельком, и окунуться в мир вращающихся барабанов, карточных комбинаций и головокружительных возможностей. Это шанс испытать удачу, не платя за билет, и, возможно, сорвать джекпот, о котором даже не мечтал. Бездепозитные бонусы в казино

    27. заем онлайн

      Just desire to say your article is as astounding. The clearness
      in your post is just spectacular and i could assume you are an expert on this subject.

      Well with your permission let me to grab your RSS feed to
      keep up to date with forthcoming post. Thanks a million and please carry on the enjoyable work.

    28. merdeka138

      This is the perfect web site for anyone who really wants to
      find out about this topic. You know so much its almost
      tough to argue with you (not that I really would want to…HaHa).
      You certainly put a brand new spin on a subject that has been discussed for years.

      Excellent stuff, just wonderful!

    30. 888starz_egkr

      888 stars скачать на андроид [url=http://888starz-starz888.ru]http://888starz-starz888.ru[/url] .

    37. Stephencef

      Лучшие онлайн-курсы https://topkursi.ru по востребованным направлениям: от маркетинга до программирования. Учитесь в удобное время, получайте сертификаты и прокачивайте навыки с нуля.

    40. 888starz_zzkr

      скачать приложения 888 starz [url=http://888starz-starz888.ru]http://888starz-starz888.ru[/url] .

    41. Jeremyhal

      Школа Саморазвития https://bznaniy.ru онлайн-база знаний для тех, кто хочет понять себя, улучшить мышление, прокачать навыки и выйти на новый уровень жизни.

    Leave a Comment

    Your email address will not be published. Required fields are marked *

    Scroll to Top