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<?php $foo = new class {private $bar = '2';}; var_dump(serialize($foo));
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Uncaught Exception: Serialization of 'class@anonymous' is not allowed in /in/eUoup:4 Stack trace: #0 /in/eUoup(4): serialize(Object(class@anonymous)) #1 {main} thrown in /in/eUoup on line 4
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/eUoup on line 3
Process exited with code 255.

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