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<?php var_dump(array('a' => 1) + array('c' => 123, 'd' => 23));
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> int(1) ["c"]=> int(123) ["d"]=> int(23) }