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<?php $a = array (1, 2, 3); $b = array ("a" => 1, "11" => 4); var_dump ($a + $b); var_dump (array_merge($a, $b));
Output for 4.3.0 - 5.6.26, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) ["a"]=> int(1) [11]=> int(4) } array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) ["a"]=> int(1) [3]=> int(4) }