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run code in 200+ php & hhvm versions
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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(); ?>
based on IgX2b
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Access to undeclared static property: A::$instanses in /in/TsO7g:13 Stack trace: #0 /in/TsO7g(28): T::getInstance() #1 {main} thrown in /in/TsO7g on line 13
Process exited with code 255.
Output for 5.3.17 - 5.6.28
Fatal error: Access to undeclared static property: A::$instanses in /in/TsO7g on line 13
Process exited with code 255.