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<?php $a = array('a' => 'a', 'c' => 'ca'); $b = array('b' => 'b', 'c' => 'cb'); var_dump(array_merge($a, $b));
Output for 4.3.0 - 7.2.0
array(3) { ["a"]=> string(1) "a" ["c"]=> string(2) "cb" ["b"]=> string(1) "b" }