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Commit 3b8b0de

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Observer
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‎Observer/index.php

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<?php
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/**
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* Design pattern "Observer" (Behavioral)
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* This is demo code
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* See for details: http://maxsite.org/page/php-patterns
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*/
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/**
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* Observable use standart interface SplSubject
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*/
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class Observable implements \SplSubject
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{
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/**
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* list of observers
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*/
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private $observers;
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/**
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* create standart class SplObjectStorage
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*/
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function __construct()
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{
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$this->observers = new SplObjectStorage();
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}
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/**
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* standart method of SplObjectStorage
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*/
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function attach(SplObserver $observer)
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{
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$this->observers->attach($observer);
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}
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/**
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* standart method of SplObjectStorage
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*/
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function detach(SplObserver $observer)
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{
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$this->observers->detach($observer);
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}
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/**
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* send notify
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*/
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function notify()
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{
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foreach ($this->observers as $obj) {
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$obj->update($this);
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}
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}
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}
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/**
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* Observer use standart interface SplObserver
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*/
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class Observer1 implements \SplObserver
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{
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/**
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* get notify from Observable
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*/
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function update(SplSubject $subject)
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{
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echo 'update Observer1<br>';
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}
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}
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/**
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* another class for Observer
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*/
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class Observer2 implements \SplObserver
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{
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function update(SplSubject $subject)
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{
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echo 'update Observer2<br>';
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}
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}
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/**
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* demo
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*/
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/**
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* create Observable
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*/
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$observable = new Observable();
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/**
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* create Observers
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*/
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$o1 = new Observer1();
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$o2 = new Observer2();
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/**
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* attach Observers to Observable
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*/
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$observable->attach($o1);
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$observable->attach($o2);
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/**
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* send notify
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*/
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$observable->notify();
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/*
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update Observer1
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update Observer2
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*/
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/**
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* exclude Observer1
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*/
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$observable->detach($o1);
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/**
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* send notify
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*/
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$observable->notify();
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/*
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update Observer2
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*/
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# end of file

‎README.md

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* "Builder" (Creational)
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* "Strategy" (Behavioral)
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* "Adapter" (Structural)
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* "Observer" (Behavioral)
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(c) MaxSite.org, 2019, http://maxsite.org/

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