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<?php print_r(array_merge([1, 2, 3], [2, 0]));
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.2.9
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 2 [4] => 0 )