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<?php class Test { public function __serialize() { return $this; } } serialize(new Test);
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Fatal error: Uncaught TypeError: Test::__serialize() must return an array in /in/HLiTj:9 Stack trace: #0 /in/HLiTj(9): serialize(Object(Test)) #1 {main} thrown in /in/HLiTj on line 9
Process exited with code 255.
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33

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