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<?php // define("FOOq", "MyUndefinedClass"); class MyClass { public string $property = "myValue"; } class MyUndefinedClassB { } $myObject = new MyClass; $foo = serialize($myObject); // unserializes all objects into __PHP_Incomplete_Class objects $disallowed = unserialize($foo, ["allowed_classes" => false]); var_dump($disallowed); // unserializes all objects into __PHP_Incomplete_Class objects except those of MyClass2 and MyClass3 $disallowed2 = unserialize($foo, ["allowed_classes" => ["MyClass2", "MyClass3"]]); var_dump($disallowed2); // unserializes undefined class into __PHP_Incomplete_Class object $undefinedClass = unserialize('O:16:"MyUndefinedClass":0:{}'); var_dump($undefinedClass); // $myObjectB = new MyUndefinedClassB; // $fooB = serialize($myObjectB); // $fooB = 'O:17:"MyUndefinedClassB":0:{}'; // echo PHP_EOL.'var_dump($fooB);'.PHP_EOL; // var_dump($fooB); // $undefinedClassB = unserialize($fooB); $undefinedClassB = unserialize('O:17:"MyUndefinedClassB":0:{}'); var_dump($undefinedClassB); ?>