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<?php $a = array(0 => 'a', 1 => 'b', 2 => 'c'); $b = array(1 => 'G', 2 => 'L'); var_dump($b + $a); var_dump(array_merge($b, $a));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [1]=> string(1) "G" [2]=> string(1) "L" [0]=> string(1) "a" } array(5) { [0]=> string(1) "G" [1]=> string(1) "L" [2]=> string(1) "a" [3]=> string(1) "b" [4]=> string(1) "c" }