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<?php $data = [ 9 => [ 1 => [2 => 433, 6 => 2, 4 => 101], 3 => [6 => 999], ], 14 => [ 2 => [2 => 0, 6 => 2], ] ]; $result = array_map(fn($v) => array_sum(array_map(fn($v) => array_sum($v), $v)), $data); print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [9] => 1535 [14] => 2 )

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