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<?php $arr1 = array("a" => "b"); $arr2 = array("c" => "d"); $arr1 += $arr2; var_dump($arr1);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["a"]=> string(1) "b" ["c"]=> string(1) "d" }