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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 } } $x = new ChildClass();
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Deprecated: defined(): Passing null to parameter #1 ($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.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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.
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/Pfgg9:9 Stack trace: #0 /in/Pfgg9(25): ParentClass->__construct() #1 {main} thrown in /in/Pfgg9 on line 9
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/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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