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<?php class C {} class D extends C {} $c = serialize(new C); $d = serialize(new D); var_dump(unserialize($c, ["allowed_classes" => ["C"]])); var_dump(unserialize($c, ["allowed_classes" => ["D"]])); var_dump(unserialize($d, ["allowed_classes" => ["C"]])); var_dump(unserialize($d, ["allowed_classes" => ["D"]]));
Output for git.master, git.master_jit, rfc.property-hooks
object(C)#1 (0) { } object(__PHP_Incomplete_Class)#1 (1) { ["__PHP_Incomplete_Class_Name"]=> string(1) "C" } object(__PHP_Incomplete_Class)#1 (1) { ["__PHP_Incomplete_Class_Name"]=> string(1) "D" } object(D)#1 (0) { }

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