note 95196 added to language.oop5.patterns

<?php /** * Class Singleton is a generic implementation of the singleton design pattern. * * Extending this class allows to make a single instance easily accessible by * many other objects. * * @author Quentin Berlemont <quentinberlemont@gmail.com> */ abstract class Singleton { /** * Prevents direct creation of object. * * @param void * @return void */ protected function __construct() {} /** * Prevents to clone the instance. * * @param void * @return void */ final private function __clone() {} /** * Gets a single instance of the class the static method is called in. * * See the {@link http://php.net/lsb Late Static Bindings} feature for more * information. * * @param void * @return object Returns a single instance of the class. */ final static public function getInstance() { static $instance = null; return $instance ?: $instance = new static; } } ?> E.g. <?php // Foo class class Foo extends \Framework\Core\Singleton { // Bar method public function bar() { echo __CLASS__ . PHP_EOL; } } // Returns a single instance of Foo class $foo = Foo::getInstance(); // Prints: Foo $foo->bar(); ?> Best regards, Quentin. ---- Server IP: 195.221.21.36 Probable Submitter: 84.103.144.176 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.patterns.php Edit -- https://master.php.net/note/edit/95196 Del: integrated -- https://master.php.net/note/delete/95196/integrated Del: useless -- https://master.php.net/note/delete/95196/useless Del: bad code -- https://master.php.net/note/delete/95196/bad+code Del: spam -- https://master.php.net/note/delete/95196/spam Del: non-english -- https://master.php.net/note/delete/95196/non-english Del: in docs -- https://master.php.net/note/delete/95196/in+docs Del: other reasons-- https://master.php.net/note/delete/95196 Reject -- https://master.php.net/note/reject/95196 Search -- https://master.php.net/manage/user-notes.php