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<?php class Foo { protected $foo = 123; } $foo = new Foo(); $serializedFoo = serialize($foo); $unserializedFoo = unserialize($serializedFoo, ['allowed_classes' => Foo::class]); var_dump($serializedFoo, $unserializedFoo);
Output for 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 TypeError: unserialize(): Option "allowed_classes" must be of type array|bool, string given in /in/Fc9Td:11 Stack trace: #0 /in/Fc9Td(11): unserialize('O:3:"Foo":1:{s:...', Array) #1 {main} thrown in /in/Fc9Td on line 11
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 TypeError: unserialize(): Option "allowed_classes" must be of type array|bool, string given in /in/Fc9Td:11 Stack trace: #0 /in/Fc9Td(11): unserialize('O:3:"Foo":1:{s:...', Array) #1 {main} thrown in /in/Fc9Td on line 11
Process exited with code 255.
Output for 7.1.6, 7.3.24 - 7.3.33, 7.4.12 - 7.4.33
Warning: unserialize(): allowed_classes option should be array or boolean in /in/Fc9Td on line 11 string(33) "O:3:"Foo":1:{s:6:"*foo";i:123;}" bool(false)

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