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PSR-0 compliance
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@@ -1,30 +1,16 @@
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<?php
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<?php
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namespace DesignPatterns;
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namespace DesignPatterns\Observer;
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/**
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/**
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* Observer pattern
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* Observer pattern : The observed object (the subject)
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*
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*
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* Purpose:
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* The subject maintains a list of Observer and send notificiations.
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* to implement a publish/subscribe behaviour to an object, whenever a "Subject" object changes it's state, the attached
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* "Observers" will be notified. It is used to shorten the amount of coupled objects and uses loose coupling instead
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*
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* Examples:
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* - a message queue system is observed to show the progress of a job in a GUI
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*
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* PHP already defines two interfaces that can help to implement this pattern: SplObserver and SplSubject
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*
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*
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*/
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*/
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class UserObserver implements \SplObserver
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{
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public function update(\SplSubject $subject)
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{
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echo get_class($subject) . ' has been updated';
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}
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}
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class User implements \SplSubject
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class User implements \SplSubject
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{
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{
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protected $_data = array();
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protected $_data = array();
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/**
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/**
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@@ -86,9 +72,6 @@ class User implements \SplSubject
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// notify the observers, that user has been updated
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// notify the observers, that user has been updated
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$this->notify();
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$this->notify();
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}
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}
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}
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}
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$user = new User();
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$user->attach(new UserObserver());
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$user->notify();
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26
Observer/UserObserver.php
Normal file
26
Observer/UserObserver.php
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@@ -0,0 +1,26 @@
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<?php
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namespace DesignPatterns\Observer;
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/**
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* Observer pattern
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*
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* Purpose:
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* to implement a publish/subscribe behaviour to an object, whenever a "Subject" object changes it's state, the attached
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* "Observers" will be notified. It is used to shorten the amount of coupled objects and uses loose coupling instead
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*
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* Examples:
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* - a message queue system is observed to show the progress of a job in a GUI
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*
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* PHP already defines two interfaces that can help to implement this pattern: SplObserver and SplSubject
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*
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*/
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class UserObserver implements \SplObserver
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{
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public function update(\SplSubject $subject)
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{
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echo get_class($subject) . ' has been updated';
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}
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}
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