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<?php $c1 = new class() implements Serializable { public function serialize() { return 'foo'; } public function unserialize($data) { return new self(); } }; var_dump(serialize($c1));
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Deprecated: Serializable@anonymous implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /in/jT8sU on line 3 Fatal error: Uncaught Exception: Serialization of 'Serializable@anonymous' is not allowed in /in/jT8sU:12 Stack trace: #0 /in/jT8sU(12): serialize(Object(Serializable@anonymous)) #1 {main} thrown in /in/jT8sU on line 12
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 Deprecated: Serializable@anonymous implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /in/jT8sU on line 3 Fatal error: Uncaught Exception: Serialization of 'Serializable@anonymous' is not allowed in /in/jT8sU:12 Stack trace: #0 /in/jT8sU(12): serialize(Object(Serializable@anonymous)) #1 {main} thrown in /in/jT8sU on line 12
Process exited with code 255.
Output for 8.0.0 - 8.0.30
Fatal error: Uncaught Exception: Serialization of 'Serializable@anonymous' is not allowed in /in/jT8sU:12 Stack trace: #0 /in/jT8sU(12): serialize(Object(Serializable@anonymous)) #1 {main} thrown in /in/jT8sU on line 12
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Exception: Serialization of 'class@anonymous' is not allowed in /in/jT8sU:12 Stack trace: #0 /in/jT8sU(12): serialize(Object(class@anonymous)) #1 {main} thrown in /in/jT8sU on line 12
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/jT8sU on line 3
Process exited with code 255.

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