Online PHP editor | output for mnSou

<?php $lookup = array_flip(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']); $months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Sep', 'Oct', 'Dec']; $result = []; foreach ($months as $i => $month) { if ($i && $lookup[$month] === $lookup[$months[$i - 1]] + 1) { $ref = strtok($ref, "-") . "-$month"; } else { unset($ref); $ref = $month; $result[] = &$ref; } } var_export($result);