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<?php $a = array('a'=>1, 'b'=>2); var_dump($a + array('a' =>4, 'c' =>3)); var_dump(array_merge($a, array('a' =>4, 'c' =>3)));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } array(3) { ["a"]=> int(4) ["b"]=> int(2) ["c"]=> int(3) }

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