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<?php $arr = [1 => [4,3,2]]; $arr1 = [2 => [5,3,9]]; $res = $arr + $arr1; print_r($res);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [1] => Array ( [0] => 4 [1] => 3 [2] => 2 ) [2] => Array ( [0] => 5 [1] => 3 [2] => 9 ) )

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