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<?php $foo = array("a" => 5, "b" => 6); $foo += array("c" => 12, "b" => 17); var_dump($foo);
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(5) ["b"]=> int(6) ["c"]=> int(12) }