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<?php $a = array(1,2,3); $b = array(array('A')); var_dump(array_merge($a, $b)); var_dump(array_merge_recursive($a, $b));
Output for 4.3.0 - 7.1.0
array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> array(1) { [0]=> string(1) "A" } } array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> array(1) { [0]=> string(1) "A" } }