<?php 
function numberToMonth($number) {
    $months = [
        1 => "January",
        2 => "February",
        3 => "March",
        4 => "April",
        5 => "May",
        6 => "June",
        7 => "July",
        8 => "August",
        9 => "September",
        10 => "October",
        11 => "November",
        12 => "December"
    ];

    if (array_key_exists($number, $months)) {
        return $months[$number];
    } else {
        return "Invalid month number";
    }
}
 ?>