Online PHP editor | refs for Ct9Yl

<?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, 'count', 'yearmonth'); foreach ($dates as &$date) { $date['count'] = $lookup[$date['yearmonth']] ?? 0; } var_export($dates);