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<?php var_dump(array('10'=>'ten') + array('20' =>'twenty'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [10]=> string(3) "ten" [20]=> string(6) "twenty" }