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<?php $a = new class {}; class_alias(get_class($a), 'A'); class B extends A{} $b = new B; print serialize($b);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Exception: Serialization of 'B' is not allowed in /in/a9XXi:7 Stack trace: #0 /in/a9XXi(7): serialize(Object(B)) #1 {main} thrown in /in/a9XXi on line 7
Process exited with code 255.

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