Online PHP editor | refs for auRYR

<?php $array = [ 'MONDAY' => [ 'REFRIGERATOR' => [3, 9, 7], 'WASHINGMACHINE' => [2, 4, 2, 8] ], 'TUESDAY' => [ 'REFRIGERATOR' => [5, 3, 8], 'OVEN' => [4, 1, 4] ], 'WEDNESDAY' => [ 'TV' => [6, 9], 'REFRIGERATOR' => [2, 3, 5, 2] ], 'THURSDAY' => [ 'TV' => [5, 3, 3, 2], 'FAN' => [4, 9, 8, 5] ], 'FRIDAY' => [ 'WASHINGMACHINE' => [8, 5], 'OVEN' => [3, 9, 7] ] ]; $result = []; foreach ($array as $set) { foreach ($set as $k => $values) { $result[$k] = ($result[$k] ?? 0) + array_sum($values); } } var_export($result);