Tutorial Build a Calendar Table

function build_calendar($month,$year,$dateArray) {

// Create array containing abbreviations of days of week.
$daysOfWeek = array('S','M','T','W','T','F','S');

// What is the first day of the month in question?
$firstDayOfMonth = mktime(0,0,0,$month,1,$year);

// How many days does this month contain?
$numberDays = date('t',$firstDayOfMonth);