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run code in 150+ php & hhvm versions
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<?php $arr1 = array(1,2,3); var_dump(array_merge($arr1, array(3,2,3)));
based on gPENZ
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(3) [4]=> int(2) [5]=> int(3) }