Online PHP editor | refs for a13iC

<?php $arr1 = [ "Friday" => ["Breakfast" => 32, "Lunch" => 45], "Sunday" => ["Lunch" => 12] ]; $arr2 = [ "Sunday" => ["Breakfast" => 7, "Lunch" => 3], "Monday" => ["Breakfast" => 12] ]; $arr3 = [ "Monday" => ["Breakfast" => 31] ]; $result = []; foreach (array_merge([$arr1], [$arr2], [$arr3]) as $array) { foreach ($array as $day => $meals) { foreach ($meals as $meal => $count) { $result[$day][$meal] = ($result[$day][$meal] ?? 0) + $count; } } } var_export($result);