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<?php class A { protected static $_instance; protected function __construct() {} public static function getInstance() { if (self::$_instance === null) { self::$_instance = new self(); } return self::$_instance; } } class B extends A { public function hi() { echo 'HI'; } } echo get_class(B::getInstance()); $b = B::getInstance(); $b->hi();
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
A Fatal error: Uncaught Error: Call to undefined method A::hi() in /in/e8Q2o:27 Stack trace: #0 {main} thrown in /in/e8Q2o on line 27
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
A Fatal error: Call to undefined method A::hi() in /in/e8Q2o on line 27
Process exited with code 255.
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