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<?php var_dump(array_merge(array(1,2,3,4,5,6,7,8,9), array(1,2,3,4,5,6,7,8,9)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(18) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) [7]=> int(8) [8]=> int(9) [9]=> int(1) [10]=> int(2) [11]=> int(3) [12]=> int(4) [13]=> int(5) [14]=> int(6) [15]=> int(7) [16]=> int(8) [17]=> int(9) }