expiryDates.php

<?php

function expiryDates() {
    $january = Carbon::now()->startOfYear();
    $eachMonth = new DateInterval('P1M');
    $december = Carbon::now()->endOfYear();
    return collect(new DatePeriod($january, $eachMonth, $december))->map(function ($date) {
        return $date->format('m/Y');
    });
}

var_dump(expiryDates()->all());