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run code in 200+ php & hhvm versions
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<?php $array1 = array(1,2,3); $array2 = array(4,5,6); var_dump(array_merge($array1,$array2));
Output for 4.3.0 - 7.2.0
array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) }