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