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<?php class DriverBaseService { private static $instance; public static function getInstance() { if(empty(self::$instance)) { self::$instance = new self(); } return self::$instance; } public function test() { echo __CLASS__; } } class DriverService extends DriverBaseService { public function xx() { echo "AAA\n"; } } DriverService::getInstance()->xx();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Call to undefined method DriverBaseService::xx() in /in/EkIX6:19 Stack trace: #0 {main} thrown in /in/EkIX6 on line 19
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Call to undefined method DriverBaseService::xx() in /in/EkIX6 on line 19
Process exited with code 255.

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