i think that Observer pattern is always implemented as "static" to be called from any scope, for example:
<?php
class 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 static
Observer::hereIsnoNeedToInstantiateAgain();
?>
SplSubject::attach
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
SplSubject::attach — Attach an SplObserver
Descrizione
Attaches an SplObserver so that it can be notified of updates.
Avviso
Questa funzione, al momento non è documentata; è disponibile soltanto la lista degli argomenti.
Valori restituiti
Nessun valore viene restituito.
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User Contributed Notes 2 notes
workspace dot development at yahoo dot com ¶
13 years ago
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)]);
