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

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