Online PHP editor | refs for 0DUhM

<?php $array = [ ['city' => 'NewYork', 'cash' => '1000'], ['city' => 'Philadelphia', 'cash' => '2300'], ['city' => 'NewYork', 'cash' => '2000'] ]; foreach ($array as $row) { $result[$row['city']] = [ 'city' => $row['city'], 'cash' => ($result[$row['city']]['cash'] ?? 0) + $row['cash'] ]; } var_export(array_values($result));