SplSubject::attach

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplSubject::attachAttach an SplObserver

Açıklama

public SplSubject::attach(SplObserver $observer): void

Attaches an SplObserver so that it can be notified of updates.

Uyarı

Bu işlev hala belgelendirilmemiştir; sadece bağımsız değişken listesi mevcuttur.

Bağımsız Değişkenler

observer

The SplObserver to attach.

Dönen Değerler

Hiçbir değer dönmez.

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User Contributed Notes 2 notes

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workspace dot development at yahoo dot com
13 years ago
i think that Observer pattern is always implemented as "static" to be called from any scope, for example:<?phpclass Observer {     //attach here the caller's scope     private static $stackTrace = array( );     public static function wasTriggeredOnce() {          //...if is not in the stack, then:          self::$stackTrace[] = max( debug_backtrace( ) );     }}class YourFramework {     public function launchPlatform() {          //could not let user to launch application twice!          Observer::wasTriggeredOnce();     }}//cause is staticObserver::hereIsnoNeedToInstantiateAgain(); ?>
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goran
13 years ago
The most obvious storage type for observers (stored in attach()) is array. In order to be able to detach attached objects, you should be able to identify it inside observer storage.I suggest you attach observers this way:$this->_observers[spl_object_hash($observer)] = $observer;so you can detach it later if you need:unset($this->_observers[spl_object_hash($observer)]);
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