Function to retrieve the days of the month of a given date. the table contains the number of the day in index and the day of the week in value.

getDays.php

<?php
function getDays($month = null, $year = null) {
	$list = array();
	if ($month == null) {
		$month = date('m');
	}
	if ($year == null) {
		$year = date('Y');
	}

	for ($d = 1; $d <= 31; $d++) {
        $time = mktime(12, 0, 0, $month, $d, $year);
        if (date('m', $time) == $month) {
			$list[date('d', $time)] = date('D', $time);
		}
	}
	return $list;
}