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--TEST-- __serialize() mechanism (014): Uninitialized properties can be serialized and unserialized --SKIPIF-- <?php if (PHP_VERSION_ID < 70400) { echo "skip __serialize/__unserialize not supported in php < 7.4 for compatibility with serialize()"; } if (PHP_VERSION_ID >= 80000) { echo "skip different error message format"; } ?> --FILE-- <?php class MyClass { public stdClass $o; public string $s; public ?int $i; } // 00000002 -- header // 17 07 4d79436c617373 -- object of type "MyClass" // 14 03 000000 -- with 3 uninitialized properties $m = new MyClass(); var_dump($m); var_dump(bin2hex($s = igbinary_serialize($m))); var_dump(igbinary_unserialize($s)); $m = new MyClass(); $m->o = new stdClass(); unset($m->o); $m->s = 'other'; unset($m->s); $m->i = 42; unset($m->i); // Should have the same serialized representation. var_dump($m); var_dump(bin2hex($s = igbinary_serialize($m))); try { $m->i = 'i'; } catch (TypeError $e) { echo $e->getMessage() . "\n"; } --EXPECT-- object(MyClass)#1 (0) { ["o"]=> uninitialized(stdClass) ["s"]=> uninitialized(string) ["i"]=> uninitialized(?int) } string(36) "0000000217074d79436c6173731403000000" object(MyClass)#2 (0) { ["o"]=> uninitialized(stdClass) ["s"]=> uninitialized(string) ["i"]=> uninitialized(?int) } object(MyClass)#2 (0) { ["o"]=> uninitialized(stdClass) ["s"]=> uninitialized(string) ["i"]=> uninitialized(?int) } string(36) "0000000217074d79436c6173731403000000" Typed property MyClass::$i must be int or null, string used