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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 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
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.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/a9XXi on line 3
Process exited with code 255.

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