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<?php abstract class T { static public $instanses; final private function __construct(){ } public static function getInstance() { var_dump(static::$instanses); if (!(static::$instanses instanceof static)) { static::$instanses = new static; } var_dump(static::$instanses); return static::$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 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
NULL object(A)#1 (0) { } object(A)#1 (0) { } object(A)#1 (0) { } object(B)#2 (0) { } object(B)#2 (0) { } Fatal error: Uncaught Error: Call to private T::__construct() from global scope in /in/ni8iO:36 Stack trace: #0 {main} thrown in /in/ni8iO on line 36
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
NULL object(A)#1 (0) { } object(A)#1 (0) { } object(A)#1 (0) { } object(B)#2 (0) { } object(B)#2 (0) { } Fatal error: Uncaught Error: Call to private T::__construct() from invalid context in /in/ni8iO:36 Stack trace: #0 {main} thrown in /in/ni8iO on line 36
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
NULL object(A)#1 (0) { } object(A)#1 (0) { } object(A)#1 (0) { } object(B)#2 (0) { } object(B)#2 (0) { } Fatal error: Call to private T::__construct() from invalid context in /in/ni8iO on line 36
Process exited with code 255.

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