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<?php class Foo{ const CON = 'CON_FOO'; static private $instance; public static function getInstance() { if (!isset(self::$instance)) { $c = __CLASS__; self::$instance = new $c; } return self::$instance; } } class FooChild extends Foo{ const CON = 'CON_FOOCHILD'; static private $instance; public static function getInstance() { if (!isset(self::$instance)) { $c = __CLASS__; self::$instance = new $c; } return self::$instance; } } $inst = FooChild::getInstance(); echo $inst::CON;
Output for git.master, git.master_jit, rfc.property-hooks
CON_FOOCHILD

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