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<?php $a = range(1,10); $b = range(1,10); var_dump(array_merge($a, $b));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(20) { [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(10) [10]=> int(1) [11]=> int(2) [12]=> int(3) [13]=> int(4) [14]=> int(5) [15]=> int(6) [16]=> int(7) [17]=> int(8) [18]=> int(9) [19]=> int(10) }