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<?php define('EXCEPTION_CATCHER', PHP_VERSION_ID < 70000 ? Exception : Throwable); try{ throw new Exception('aaa'); }catch(EXCEPTION_CATCHER $e) { echo 'joho'; }
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
Fatal error: Uncaught Error: Undefined constant "Throwable" in /in/Gj3Ir:3 Stack trace: #0 {main} thrown in /in/Gj3Ir on line 3
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant Throwable - assumed 'Throwable' (this will throw an Error in a future version of PHP) in /in/Gj3Ir on line 3 Fatal error: Uncaught Exception: aaa in /in/Gj3Ir:6 Stack trace: #0 {main} thrown in /in/Gj3Ir on line 6
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25
Notice: Use of undefined constant Throwable - assumed 'Throwable' in /in/Gj3Ir on line 3 Fatal error: Uncaught Exception: aaa in /in/Gj3Ir:6 Stack trace: #0 {main} thrown in /in/Gj3Ir on line 6
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Notice: Use of undefined constant Exception - assumed 'Exception' in /in/Gj3Ir on line 3 Fatal error: Uncaught exception 'Exception' with message 'aaa' in /in/Gj3Ir:6 Stack trace: #0 {main} thrown in /in/Gj3Ir on line 6
Process exited with code 255.

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244.19 ms | 402 KiB | 336 Q