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<?php class abc { } try { throw new abc(); } catch (abc $e) { echo 'error'; }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 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: Cannot throw objects that do not implement Throwable in /in/UH0BP:7 Stack trace: #0 {main} thrown in /in/UH0BP on line 7
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Exceptions must be valid objects derived from the Exception base class in /in/UH0BP on line 7
Process exited with code 255.

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