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Commit 4847edd

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Multiton
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‎Multiton/index.php

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<?php
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/**
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* Design pattern "Multiton" (Creational)
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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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* Base
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*/
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trait MultitonTrait
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{
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private static $list = [];
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public static function getInstance(string $instance = 'default')
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{
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if (empty(self::$list[$instance])) self::$list[$instance] = new static();
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return self::$list[$instance];
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}
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private function __construct()
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{
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}
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private function __clone()
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{
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}
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private function __wakeup()
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{
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}
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}
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/**
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* Class for sample
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*/
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class Foo
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{
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/**
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* Add MultitonTrait to this class
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*/
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use MultitonTrait;
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/**
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* Class's own methods...
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*/
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private $var = [];
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public function addVal($v)
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{
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$this->var[] = $v;
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}
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public function getVal()
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{
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return $this->var;
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}
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}
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/**
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* demo use
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* see Singleton for other samples
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*/
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echo '<pre>'; // for print in browser
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# $foo = new Foo(); // Error: Call to private Foo::__construct()
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/**
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* get instance "Alpha"
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*/
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$foo1 = Foo::getInstance('Alpha');
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/**
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* add values
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*/
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$foo1->addVal('first');
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$foo1->addVal('second');
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/**
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* control
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*/
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print_r($foo1->getVal());
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/*
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Array
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(
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[0] => first
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[1] => second
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)
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*/
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/**
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* new instance "Beta"
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*/
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$foo2 = Foo::getInstance('Beta');
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$foo2->addVal('1000');
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$foo2->addVal('2000');
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/**
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* control
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*/
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print_r($foo2->getVal());
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/*
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Array
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(
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[0] => 1000
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[1] => 2000
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)
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*/
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/**
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* new instance "default"
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*/
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$foo3 = Foo::getInstance();
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$foo3->addVal('Abcde');
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$foo3->addVal('12345');
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/**
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* control
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*/
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print_r($foo3->getVal());
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/*
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Array
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(
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[0] => Abcde
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[1] => 12345
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)
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*/
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# end of file

‎README.md

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* "Factory method" / "Virtual Constructor" (Creational)
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* "Abstract factory" (Creational)
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* "Singleton" (Creational)
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* "Multiton" (Creational)
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(c) MaxSite.org, 2019, http://maxsite.org/

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