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<?php abstract class ParentClass { const TEST_CONSTANT = null; public function __construct() { if (!defined('static::TEST_CONSTANT') || empty(static::TEST_CONSTANT)) { throw new Exception("Please define TEST_CONSTANT!"); } } abstract protected function someFunction(); } class ChildClass extends ParentClass { protected function someFunction() { //some functionality here } } $x = new ChildClass();
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Exception: Please define TEST_CONSTANT! in /in/19qOJ:9 Stack trace: #0 /in/19qOJ(24): ParentClass->__construct() #1 {main} thrown in /in/19qOJ on line 9
Process exited with code 255.
Output for 5.5.24 - 5.6.28
Fatal error: Uncaught exception 'Exception' with message 'Please define TEST_CONSTANT!' in /in/19qOJ:9 Stack trace: #0 /in/19qOJ(24): ParentClass->__construct() #1 {main} thrown in /in/19qOJ on line 9
Process exited with code 255.
Output for 5.3.22 - 5.4.45
Parse error: syntax error, unexpected ')', expecting '(' in /in/19qOJ on line 8
Process exited with code 255.