--TEST-- new in attribute arguments --FILE-- getAttributes()[0]; $args1 = $ra->getArguments(); $obj1 = $ra->newInstance(); var_dump($args1, $obj1); // Check that we get fresh instances each time: $args2 = $ra->getArguments(); $obj2 = $ra->newInstance(); var_dump($args1[1] !== $args2[1]); var_dump($obj1->y !== $obj2->y); // Check that named args work: #[MyAttribute(y: new stdClass, x: null)] class Test2 { } $rc = new ReflectionClass(Test2::class); $ra = $rc->getAttributes()[0]; $args = $ra->getArguments(); $obj = $ra->newInstance(); var_dump($args, $obj); ?> --EXPECTF-- array(2) { [0]=> NULL [1]=> object(stdClass)#%d (0) { } } object(MyAttribute)#%d (2) { ["x"]=> NULL ["y"]=> object(stdClass)#%d (0) { } } bool(true) bool(true) array(2) { ["y"]=> object(stdClass)#%d (0) { } ["x"]=> NULL } object(MyAttribute)#%d (2) { ["x"]=> NULL ["y"]=> object(stdClass)#%d (0) { } }