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<?php define('value', 'Hello World'); abstract class ParentClass { const TEST_CONSTANT = null; public function __construct() { if (!defined(self::TEST_CONSTANT)) { throw new Exception("Please define TEST_CONSTANT!"); } } abstract protected function someFunction(); } class ChildClass extends ParentClass { const TEST_CONSTANT = "value"; protected function someFunction() { //some functionality here } } $x = new ChildClass();
based on T64JY
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Exception: Please define TEST_CONSTANT! in /in/LeIJk:11 Stack trace: #0 /in/LeIJk(27): ParentClass->__construct() #1 {main} thrown in /in/LeIJk on line 11
Process exited with code 255.
Output for 5.3.22 - 5.6.28
Fatal error: Uncaught exception 'Exception' with message 'Please define TEST_CONSTANT!' in /in/LeIJk:11 Stack trace: #0 /in/LeIJk(27): ParentClass->__construct() #1 {main} thrown in /in/LeIJk on line 11
Process exited with code 255.