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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 } } $x = new ChildClass();
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Deprecated: defined(): Passing null to parameter #1 ($constant_name) of type string is deprecated in /in/LeIJk on line 10 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 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
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 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
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.
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