Multiton

Author: maxsite

Multiton/index.php

@@ -0,0 +1,131 @@
+<?php
+
+/**
+ * Design pattern "Multiton" (Creational)
+ * This is demo code
+ * See for details: http://maxsite.org/page/php-patterns
+ */
+
+/**
+ * Base
+ */
+trait MultitonTrait
+{
+ private static $list = [];
+
+ public static function getInstance(string $instance = 'default')
+ {
+ if (empty(self::$list[$instance])) self::$list[$instance] = new static();
+ 
+ return self::$list[$instance];
+ }
+
+ private function __construct()
+ {
+ }
+ private function __clone()
+ {
+ }
+ private function __wakeup()
+ {
+ }
+}
+
+/**
+ * Class for sample
+ */
+class Foo
+{
+ /**
+ * Add MultitonTrait to this class
+ */
+ use MultitonTrait;
+
+ /**
+ * Class's own methods...
+ */
+ private $var = [];
+
+ public function addVal($v)
+ {
+ $this->var[] = $v;
+ }
+
+ public function getVal()
+ {
+ return $this->var;
+ }
+}
+
+
+/**
+ * demo use 
+ * see Singleton for other samples
+ */
+
+echo '<pre>'; // for print in browser
+
+# $foo = new Foo(); // Error: Call to private Foo::__construct()
+
+/**
+ * get instance "Alpha"
+ */
+$foo1 = Foo::getInstance('Alpha');
+
+/**
+ * add values
+ */
+$foo1->addVal('first');
+$foo1->addVal('second');
+
+/**
+ * control
+ */
+print_r($foo1->getVal()); 
+/*
+ Array
+ (
+ [0] => first
+ [1] => second
+ )
+ */
+
+/**
+ * new instance "Beta"
+ */
+$foo2 = Foo::getInstance('Beta');
+$foo2->addVal('1000');
+$foo2->addVal('2000');
+
+/**
+ * control
+ */
+print_r($foo2->getVal());
+/*
+ Array
+ (
+ [0] => 1000
+ [1] => 2000
+ )
+ */
+
+/**
+ * new instance "default"
+ */
+$foo3 = Foo::getInstance();
+$foo3->addVal('Abcde');
+$foo3->addVal('12345');
+
+/**
+ * control
+ */
+print_r($foo3->getVal());
+/*
+ Array
+ (
+ [0] => Abcde
+ [1] => 12345
+ )
+ */
+
+# end of file

README.md

@@ -7,6 +7,7 @@ See details on http://maxsite.org/page/php-patterns
 * "Factory method" / "Virtual Constructor" (Creational)
 * "Abstract factory" (Creational)
 * "Singleton" (Creational)
+* "Multiton" (Creational)
 
 
 (c) MaxSite.org, 2019, http://maxsite.org/