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<?php var_dump(array_merge(array('2013' => 'y'), array('foo'=>'nar')));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(1) "y" ["foo"]=> string(3) "nar" }