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<?php class Test { public function __serialize() { return $this; } } serialize(new Test);
Output for 7.4.0 - 7.4.23, 8.0.0 - 8.0.11, 8.1rc1 - rc2
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 - 7.3.30
Output for 4.3.10
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/HLiTj on line 4
Process exited with code 255.

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