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<?php $r = array_merge(array(1, 2, 3), array(1, 2, 3)); var_dump($r);
Output for 5.6.30
array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(1) [4]=> int(2) [5]=> int(3) }