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<?php 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 } } $x = new ChildClass();
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: defined(): Passing null to parameter #1 ($constant_name) of type string is deprecated in /in/Pfgg9 on line 8 Fatal error: Uncaught Exception: Please define TEST_CONSTANT! in /in/Pfgg9:9 Stack trace: #0 /in/Pfgg9(25): ParentClass->__construct() #1 {main} thrown in /in/Pfgg9 on line 9
Process exited with code 255.

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