Online PHP editor | refs for fUaaJ

<?php $array1 = [ ['subscribers' => 2, 'dt_date' => '2014-02-27'], ['subscribers' => 2, 'dt_date' => '2014-02-25'], ['subscribers' => 1, 'dt_date' => '2014-02-07'] ]; $array2 = [ ['unsubscribers' => 1, 'dt_date' => '2014-02-27'], ['unsubscribers' => 1, 'dt_date' => '2014-02-01'] ]; $result = []; $default = array_fill_keys(['subscribers', 'unsubscribers'], 0); foreach (array_merge($array1, $array2) as $row) { $result[$row['dt_date']] = array_merge($result[$row['dt_date']] ?? $default, $row); } var_export(array_values($result));