Online PHP editor | refs for cHoIZ

<?php $jobs = [ ['count' => 3, 'yearmonth' => '2019-7'], ['count' => 3, 'yearmonth' => '2019-9'], ['count' => 5, 'yearmonth' => '2019-10'], ]; $dates = [ ['yearmonth' => '2019-6'], ['yearmonth' => '2019-7'], ['yearmonth' => '2019-8'], ['yearmonth' => '2019-9'], ['yearmonth' => '2019-10'], ]; $lookup = array_column($jobs, null, 'yearmonth'); $result = []; foreach ($dates as $date) { $result[] = $lookup[$date['yearmonth']] ?? ['count' => 0] + $date; } var_export($result);