note 75862 added to function.get-class

janci's Singleton example is all well and good, until you create another class "Bar" which also extends Singleton. <?php $single_foo = Foo::getInstance(); $single_bar = Bar::getInstance(); ?> $single_bar will now be an instance of Foo! This is because there is only one copy of the static variable $__instance in the Singleton class. Here is a better Singleton class: <?php abstract class Singleton { static $_instances = array(); //Prevent singletons from being instantiated other than via getInstance(); protected function __construct() {} protected function __clone() {} static function getInstance($class_name) { if(!isset(self::$_instances[$class_name])) { self::$_instances[$class_name] = new $class_name(); } return self::$_instances[$class_name]; } }?> Unfortunately, you are still required to define Foo as janci does. I would love to see an example where the only thing you add to the class is "extends Singleton" and you're done, but that seems to be impossible. ---- Server IP: 64.71.164.2 Probable Submitter: 66.15.236.210 ---- Manual Page -- http://www.php.net/manual/en/function.get-class.php Edit -- https://master.php.net/note/edit/75862 Del: integrated -- https://master.php.net/note/delete/75862/integrated Del: useless -- https://master.php.net/note/delete/75862/useless Del: bad code -- https://master.php.net/note/delete/75862/bad+code Del: spam -- https://master.php.net/note/delete/75862/spam Del: non-english -- https://master.php.net/note/delete/75862/non-english Del: in docs -- https://master.php.net/note/delete/75862/in+docs Del: other reasons-- https://master.php.net/note/delete/75862 Reject -- https://master.php.net/note/reject/75862 Search -- https://master.php.net/manage/user-notes.php