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<?php $a = array("a" => 1, "b" => 2); $b = array("a" => 2, "c" => 3); var_dump($a + $b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) }