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<?php $a = array('a' => 1, 'b' => 2); $c = array('a' => 10, 'c' => 9); $a += $c; echo var_dump($a);
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(9) }