Online PHP editor | refs for S0LBa

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