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<?php abstract class T { final private function __construct(){ } public static function getInstance() { if (!isset(static::$instanses)) { static::$instanses = new static; } return static::$instanses; } } class A extends T { } class B extends A { } $t = A::getInstance(); var_dump($t); $t1 = B::getInstance(); var_dump($t1); new B(); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Access to undeclared static property A::$instanses in /in/TsO7g:13 Stack trace: #0 /in/TsO7g(28): T::getInstance() #1 {main} thrown in /in/TsO7g on line 13
Process exited with code 255.

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