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--TEST-- Test PHP 8.2 readonly classes --SKIPIF-- <?php if (!extension_loaded("igbinary")) print "skip\n"; if (PHP_VERSION_ID < 80200) print "skip php < 8.2\n"; ?> --FILE-- <?php readonly class C { public int $a; public static function create() { $c = new C(); $c->a = 8; return $c; } } $c = new C(); $ser = igbinary_serialize($c); echo urlencode($ser), "\n"; var_dump(igbinary_unserialize($ser)); $c = C::create(); $ser = igbinary_serialize($c); echo urlencode($ser), "\n"; var_dump(igbinary_unserialize($ser)); $invalid1 = str_replace('a', 'b', $ser); try { var_dump(igbinary_unserialize($invalid1)); } catch (Error $e) { printf("%s: %s\n", $e::class, $e->getMessage()); } --EXPECT-- %00%00%00%02%17%01C%14%01%00 object(C)#2 (0) { ["a"]=> uninitialized(int) } %00%00%00%02%17%01C%14%01%11%01a%06%08 object(C)#1 (1) { ["a"]=> int(8) } Error: Cannot create dynamic property C::$b in igbinary_unserialize