Calendar Function

<?php

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);

    // Retrieve some information about the first day of the
    // month in question.
    $dateComponents = getdate($firstDayOfMonth);

    // What is the name of the month in question?
    $monthName = $dateComponents['month'];

    // What is the index value (0-6) of the first day of the
    // month in question.
    $dayOfWeek = $dateComponents['wday'];

    // Create the table tag opener and day headers

    $calendar = "<table class='calendar'>";
    $calendar .= "<caption>$monthName $year</caption>";
    $calendar .= "<tr>";

    // Create the calendar headers

    foreach($daysOfWeek as $day) {
         $calendar .= "<th class='header'>$day</th>";
    }

    // Create the rest of the calendar

    // Initiate the day counter, starting with the 1st.

    $currentDay = 1;

    $calendar .= "</tr><tr>";

    // The variable $dayOfWeek is used to
    // ensure that the calendar
    // display consists of exactly 7 columns.

    if ($dayOfWeek > 0) {
         $calendar .= "<td colspan='$dayOfWeek'>&nbsp;</td>";
    }

    $month = str_pad($month, 2, "0", STR_PAD_LEFT);

    while ($currentDay <= $numberDays) {

         // Seventh column (Saturday) reached. Start a new row.

         if ($dayOfWeek == 7) {

              $dayOfWeek = 0;
              $calendar .= "</tr><tr>";

         }

         $currentDayRel = str_pad($currentDay, 2, "0", STR_PAD_LEFT);

         $date = "$year-$month-$currentDayRel";

         $calendar .= "<td class='day' rel='$date'>$currentDay</td>";

         // Increment counters

         $currentDay++;
         $dayOfWeek++;

    }

    // Complete the row of the last week in month, if necessary

    if ($dayOfWeek != 7) {

         $remainingDays = 7 - $dayOfWeek;
         $calendar .= "<td colspan='$remainingDays'>&nbsp;</td>";

    }

    $calendar .= "</tr>";

    $calendar .= "</table>";

    return $calendar;

}

?>

Usage

To print a table of May 2005, just do:

<?php echo build_calendar(05,2005); ?>

And you’ll get a table like this: