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Commit 95041d0

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Singleton
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‎README.md

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@@ -6,6 +6,7 @@ See details on http://maxsite.org/page/php-patterns
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* "Fluent interface" (Structural)
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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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(c) MaxSite.org, 2019, http://maxsite.org/

‎Singleton/index.php

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<?php
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/**
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* Design pattern "Singleton" (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 SingletonTrait
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{
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private static $instance;
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public static function getInstance()
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{
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if (empty(self::$instance)) self::$instance = new static();
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return self::$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 SingletonTrait to this class
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*/
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use SingletonTrait;
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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
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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 in $foo1
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*/
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$foo1 = Foo::getInstance();
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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 variable $foo2
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*/
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$foo2 = Foo::getInstance();
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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] => first
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[1] => second
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)
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*/
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/**
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* add value to $foo
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*/
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$foo1->addVal('new value');
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/**
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* control $foo1
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*/
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print_r($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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[2] => new value
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)
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*/
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/**
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* control $foo2
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*/
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print_r($foo2->getVal());
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/*
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Array
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(
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[0] => first
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[1] => second
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[2] => new value
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)
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*/
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# end of file

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