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<?php abstract class AbClass { const ABC = "12345"; public function printThing() { echo self::ABC . PHP_EOL; } } class Sub extends AbClass { protected $thing2; public function __construct() { $this->thing2 = "def"; } public function printThing() { parent::printThing(); echo ABC . PHP_EOL; echo $this->thing2 . PHP_EOL; } } $s = new Sub(); $s->printThing();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
12345 Fatal error: Uncaught Error: Undefined constant "ABC" in /in/WEKJn:19 Stack trace: #0 /in/WEKJn(26): Sub->printThing() #1 {main} thrown in /in/WEKJn on line 19
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
12345 Warning: Use of undefined constant ABC - assumed 'ABC' (this will throw an Error in a future version of PHP) in /in/WEKJn on line 19 ABC def
Output for 5.0.2 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
12345 Notice: Use of undefined constant ABC - assumed 'ABC' in /in/WEKJn on line 19 ABC def
Output for 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/WEKJn on line 7 12345PHP_EOL Notice: Use of undefined constant ABC - assumed 'ABC' in /in/WEKJn on line 19 Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/WEKJn on line 19 ABCPHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/WEKJn on line 20 defPHP_EOL
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/WEKJn on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_CLASS in /in/WEKJn on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/WEKJn on line 3
Process exited with code 255.

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