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File: htmlcalendar.class.php
<?php



/**
 * \ingroup Data
 *
 * Generates an html calendar
 *
 * PHP Calendar Class Version 1.4 (5th March 2001)
 *
 * Copyright David Wilkinson 2000 - 2001. All Rights reserved.
 *
 * This software may be used, modified and distributed freely
 * providing this copyright notice remains intact at the head
 * of the file.
 *
 * This software is freeware. The author accepts no liability for
 * any loss or damages whatsoever incurred directly or indirectly
 * from the use of this script. The author of this software makes
 * no claims as to its fitness for any purpose whatsoever. If you
 * wish to use this software you should first satisfy yourself that
 * it meets your requirements.
 *
 * URL:   http://www.cascade.org.uk/software/php/calendar/
 * Email: davidw@cascade.org.uk
 *
 * Modified by fuze (http://www.fuze.org) on 2004/07/11
 *
 * Just changed the html table output for better (CSS) accessibility
 * and variable names.
 */

class Calendar 
{
    /*
        Constructor for the Calendar class
    */
    function Calendar()
    {
    	
    }


    /**
     * Get the array of strings used to label the days of the week. This array contains seven
     *  elements, one for each day of the week. The first entry in this array represents Sunday.
     */
    function getDayNames()
    {
        return $this->dayNames;
    }


    /**
     * Set the array of strings used to label the days of the week. This array must contain seven
     * elements, one for each day of the week. The first entry in this array represents Sunday.
     */
    function setDayNames($names)
    {
        $this->dayNames = $names;
    }

    /**
     * Get the array of strings used to label the months of the year. This array contains twelve
     * elements, one for each month of the year. The first entry in this array represents January.
     */
    function getMonthNames()
    {
        return $this->monthNames;
    }

    /**
     * Set the array of strings used to label the months of the year. This array must contain twelve
     * elements, one for each month of the year. The first entry in this array represents January.
     */
    function setMonthNames($names)
    {
        $this->monthNames = $names;
    }

    /**
     * Gets the start day of the week. This is the day that appears in the first column
     * of the calendar. Sunday = 0.
     */
    function getStartDay()
    {
        return $this->startDay;
    }

    /**
     * Sets the start day of the week. This is the day that appears in the first column
     * of the calendar. Sunday = 0.
     */
    function setStartDay($day)
    {
        $this->startDay = $day;
    }


    /**
     * Gets the start month of the year. This is the month that appears first in the year
     * view. January = 1.
     */
    function getStartMonth()
    {
        return $this->startMonth;
    }

    /**
     * Sets the start month of the year. This is the month that appears first in the year
     * view. January = 1.
     */
    function setStartMonth($month)
    {
        $this->startMonth = $month;
    }


    /**
     * Return the URL to link to in order to display a calendar for a given month/year.
     * You must override this method if you want to activate the "forward" and "back"
     * feature of the calendar.
     *
     * Note: If you return an empty string from this function, no navigation link will
     * be displayed. This is the default behaviour.
     *
     * If the calendar is being displayed in "year" view, $month will be set to zero.
     */
    function getCalendarLink($month, $year)
    {
        return "";
    }

    /**
     * Return the URL to link to  for a given date.
     * You must override this method if you want to activate the date linking
     * feature of the calendar.
     *
     * Note: If you return an empty string from this function, no navigation link will
     * be displayed. This is the default behaviour.
     */
    function getDateLink($day, $month, $year)
    {
        return "";
    }


    /**
     * Return the HTML for the current month
     */
    function getCurrentMonthView()
    {
        $d = getdate(time());
        return $this->getMonthView($d["mon"], $d["year"]);
    }


    /**
     * Return the HTML for the current year
     */
    function getCurrentYearView()
    {
        $d = getdate(time());
        return $this->getYearView($d["year"]);
    }


    /**
     * Return the HTML for a specified month
     */
    function getMonthView($month, $year)
    {
        return $this->getMonthHTML($month, $year);
    }


    /**
     * Return the HTML for a specified year
     */
    function getYearView($year)
    {
        return $this->getYearHTML($year);
    }



    /********************************************************************************

        The rest are private methods. No user-servicable parts inside.

        You shouldn't need to call any of these functions directly.

    *********************************************************************************/


    /**
     * Calculate the number of days in a month, taking into account leap years.
     */
    function getDaysInMonth($month, $year)
    {
        if ($month < 1 || $month > 12)
        {
            return 0;
        }

        $d = $this->daysInMonth[$month - 1];

        if ($month == 2)
        {
            // Check for leap year
            // Forget the 4000 rule, I doubt I'll be around then...

            if ($year%4 == 0)
            {
                if ($year%100 == 0)
                {
                    if ($year%400 == 0)
                    {
                        $d = 29;
                    }
                }
                else
                {
                    $d = 29;
                }
            }
        }

        return $d;
    }


    /**
     * Generate the HTML for a given month
     */
    function getMonthHTML($m, $y, $showYear = 1, $timestamp = 0)
    {
        $s = "";

        $a = $this->adjustDate($m, $y);
        $month = $a[0];
        $year = $a[1];

    	$daysInMonth = $this->getDaysInMonth($month, $year);
    	$date = getdate(mktime(12, 0, 0, $month, 1, $year));

    	$first = $date["wday"];
    	$monthName = $this->monthNames[$month - 1];
    	
    	$prev = $this->adjustDate($month - 1, $year);
    	$next = $this->adjustDate($month + 1, $year);

    	if ($showYear == 1)
    	{
    	    $prevMonth = $this->getCalendarLink($prev[0], $prev[1]);
    	    $nextMonth = $this->getCalendarLink($next[0], $next[1]);
    	    $nextMonthName = $this->monthNames[ $next[0] - 1 ].(($showYear > 0) ? " " . $next[1] : "");
    	    $prevMonthName = $this->monthNames[ $prev[0] - 1 ].(($showYear > 0) ? " " . $prev[1] : "");
    	}
    	else
    	{
    	    $prevMonth = "";
    	    $nextMonth = "";
    	}

    	$header = $monthName . (($showYear > 0) ? " " . $year : "");
        //$s .= '<h2>'.$header.'</h2>';     // remove this line #1
    	$s .= "<table class=\"calMonth\" summary=\"\">\n";

        ///* // remove this line #2
		$s .= "<thead>\n";
        $s .= "<tr class=\"calMonthNav\">\n";
    	$s .= "\t<th class=\"calMonthBackward\">" . (($prevMonth == "") ? "&nbsp;" : "<a href=\"$prevMonth\" title=\"$prevMonthName\">&laquo;</a>")  . "</th>\n";
    	$s .= "\t<th class=\"calMonthCurrent\" colspan=\"5\">$header</th>\n";
    	$s .= "\t<th class=\"calMonthForward\">" . (($nextMonth == "") ? "&nbsp;" : "<a href=\"$nextMonth\" title=\"$nextMonthName\">&raquo;</a>")  . "</th>\n";
    	$s .= "</tr>\n";
       // */   // remove this line #3   to go to t

    	$s .= "<tr class=\"calMonthHeader\">\n";
    	$s .= "\t<th scope=\"col\" abbr=\"" . $this->dayNames[($this->startDay)%7] . "\">" . $this->dayNamesShort[($this->startDay)%7] . "</th>\n";
    	$s .= "\t<th scope=\"col\" abbr=\"" . $this->dayNames[($this->startDay+1)%7] . "\">" . $this->dayNamesShort[($this->startDay+1)%7] . "</th>\n";
    	$s .= "\t<th scope=\"col\" abbr=\"" . $this->dayNames[($this->startDay+2)%7] . "\">" . $this->dayNamesShort[($this->startDay+2)%7] . "</th>\n";
    	$s .= "\t<th scope=\"col\" abbr=\"" . $this->dayNames[($this->startDay+3)%7] . "\">" . $this->dayNamesShort[($this->startDay+3)%7] . "</th>\n";
    	$s .= "\t<th scope=\"col\" abbr=\"" . $this->dayNames[($this->startDay+4)%7] . "\">" . $this->dayNamesShort[($this->startDay+4)%7] . "</th>\n";
    	$s .= "\t<th scope=\"col\" abbr=\"" . $this->dayNames[($this->startDay+5)%7] . "\">" . $this->dayNamesShort[($this->startDay+5)%7] . "</th>\n";
    	$s .= "\t<th scope=\"col\" abbr=\"" . $this->dayNames[($this->startDay+6)%7] . "\">" . $this->dayNamesShort[($this->startDay+6)%7] . "</th>\n";
    	$s .= "</tr>\n";
		$s .= "</thead>\n";
		$s .= "<tbody>\n";

    	// We need to work out what date to start at so that the first appears in the correct column
    	$d = $this->startDay + 1 - $first;
    	while ($d > 1)
    	{
    	    $d -= 7;
    	}

        // Make sure we know when today is, so that we can use a different CSS style
        if ( $timestamp == 0 )
        {
            $today = getdate(time());
        } 
        else
        {
            $today = getdate($timestamp);
        }

    	while ($d <= $daysInMonth)
    	{
    	    $s .= "<tr>\n";

    	    for ($i = 0; $i < 7; $i++)
    	    {
        	    $class = ($year == $today["year"] && $month == $today["mon"] && $d == $today["mday"]) ? " class=\"calMonthToday\"" : " class=\"calMonthDay\"";
    	        $s .= "\t<td$class>";
    	        if ($d > 0 && $d <= $daysInMonth)
    	        {
    	            $link = $this->getDateLink($d, $month, $year);
    	            $s .= (($link == "") ? $d : "<a href=\"$link\">$d</a>");
    	        }
    	        else
    	        {
    	            $s .= "&nbsp;";
    	        }
      	        $s .= "</td>\n";
        	    $d++;
    	    }
    	    $s .= "</tr>\n";
    	}
		$s .= "</tbody>\n";
    	$s .= "</table>\n";

    	return $s;
    }


    /**
     * Generate the HTML for a given year
     */
    function getYearHTML($year)
    {
        $s = "";
    	$prev = $this->getCalendarLink(0, $year - 1);
    	$next = $this->getCalendarLink(0, $year + 1);

        $s .= "<table class=\"calYear\" summary=\"\">\n";
		$s .= "<thead>\n";
        $s .= "<tr>";
    	$s .= "\t<th class=\"calYearBackward\">" . (($prev == "") ? "&nbsp;" : "<a href=\"$prev\">&laquo;</a>")  . "</th>\n";
        $s .= "\t<th class=\"calYearCurrent\">" . (($this->startMonth > 1) ? $year . " - " . ($year + 1) : $year) ."</th>\n";
    	$s .= "\t<th class=\"calYearForward\">" . (($next == "") ? "&nbsp;" : "<a href=\"$next\">&raquo;</a>")  . "</th>\n";
        $s .= "</tr>\n";
		$s .= "</thead>\n";
		$s .= "<tbody>\n";
        $s .= "<tr>";
        $s .= "\t<td>" . $this->getMonthHTML(0 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "\t<td>" . $this->getMonthHTML(1 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "\t<td>" . $this->getMonthHTML(2 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "</tr>\n";
        $s .= "<tr>\n";
        $s .= "\t<td>" . $this->getMonthHTML(3 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "\t<td>" . $this->getMonthHTML(4 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "\t<td>" . $this->getMonthHTML(5 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "</tr>\n";
        $s .= "<tr>\n";
        $s .= "\t<td>" . $this->getMonthHTML(6 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "\t<td>" . $this->getMonthHTML(7 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "\t<td>" . $this->getMonthHTML(8 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "</tr>\n";
        $s .= "<tr>\n";
        $s .= "\t<td>" . $this->getMonthHTML(9 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "\t<td>" . $this->getMonthHTML(10 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "\t<td>" . $this->getMonthHTML(11 + $this->startMonth, $year, 0) ."</td>\n";
        $s .= "</tr>\n";
		$s .= "</tbody>\n";
        $s .= "</table>\n";

        return $s;
    }

    /**
     * Adjust dates to allow months > 12 and < 0. Just adjust the years appropriately.
     * e.g. Month 14 of the year 2001 is actually month 2 of year 2002.
     */
    function adjustDate($month, $year)
    {
        $a = array();
        $a[0] = $month;
        $a[1] = $year;

        while ($a[0] > 12)
        {
            $a[0] -= 12;
            $a[1]++;
        }

        while ($a[0] <= 0)
        {
            $a[0] += 12;
            $a[1]--;
        }

        return $a;
    }

    /**
     * The start day of the week. This is the day that appears in the first column
     * of the calendar. Sunday = 0.
     */
    var $startDay = 1;

    /**
     * The start month of the year. This is the month that appears in the first slot
     * of the calendar in the year view. January = 1.
     */
    var $startMonth = 1;

    /**
     * The labels to display for the days of the week. The first entry in this array
     * represents Sunday.
     */
    var $dayNames = array("S", "M", "T", "W", "T", "F", "S");

    /**
     * The labels to display for the months of the year. The first entry in this array
     * represents January.
     */
    var $monthNames = array("January", "February", "March", "April", "May", "June",
                            "July", "August", "September", "October", "November", "December");


    /**
     * The number of days in each month. You're unlikely to want to change this...
     * The first entry in this array represents January.
     */
    var $daysInMonth = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

}
?>