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<?php $x = array(); $y = array_merge(array('a'=>2, 'b'=>4, 'c'=>6), $x); var_dump($y);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(3) { ["a"]=> int(2) ["b"]=> int(4) ["c"]=> int(6) }