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<?php print_r(array_merge(array(1 => 1, 3 => 2), array(1 => 1, 2 => 2, 4 => 2)));
Output for 4.3.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [2] => 1 [3] => 2 [4] => 2 )