Or you could use an array with a function:
$months = Array();
$months[0] = "January";
$months[1] = "February";
$months[2] = "March";
etc..
function theMonth($i) {
$month = months[$i];
echo $month;
}
theMonth(2); // This would return 'March', as '0' = 'January', '1' = 'February', '2' = 'March', etc...
Ste