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<?php $a = unserialize('O:14:"BogusTestClass":0:{}'); var_dump(is_object($a)); var_dump($a instanceof __PHP_Incomplete_Class); $a = new __PHP_Incomplete_Class(); var_dump(is_object($a)); class A extends __PHP_Incomplete_Class { } $a = new A(); var_dump(is_object($a)); $a = 100500; var_dump(is_object($a)); $b = 100501; var_dump(is_object($b));