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<?php var_dump(array('foo', 'bar') + array('x' => 'baz', 'y' => 'bat'));
Output for 4.3.0 - 7.1.0
array(4) { [0]=> string(3) "foo" [1]=> string(3) "bar" ["x"]=> string(3) "baz" ["y"]=> string(3) "bat" }