XML driven calendar

// current time
$time = time();

// array of events built by xml files in this directory
$events = array();

// open each xml file in this directory
foreach(glob("*.xml") as $filename) {
// get the contents of the the current file
$xml_file = file_get_contents($filename, FILE_TEXT);

// create a simplexml object from the contents of the current file
$xml = simplexml_load_string($xml_file);

// create a day, link, description, etc.
$eventDay = (int)$xml->day;
$eventMonth = (int)$xml->month;
$eventYear = (int)$xml->year;
$eventLink = (string)$xml->link;
$eventDesc = (string)$xml->description;

function generate_calendar($year, $month, $days = array(), $day_name_length = 3, $month_href = NULL, $first_day = 0, $pn = array()){
$first_of_month = gmmktime(0,0,0,$month,1,$year);
#remember that mktime will automatically correct if invalid dates are entered
# for instance, mktime(0,0,0,12,32,1997) will be the date for Jan 1, 1998
# this provides a built in "rounding" feature to generate_calendar()

$day_names = array(); #generate all the day names according to the current locale
for($n=0,$t=(3+$first_day)*86400; $n<7; $n++,$t+=86400) #January 4, 1970 was a Sunday
$day_names[$n] = ucfirst(gmstrftime('%A',$t)); #%A means full textual day name

list($month, $year, $month_name, $weekday) = explode(',',gmstrftime('%m,%Y,%B,%w',$first_of_month));
$weekday = ($weekday + 7 - $first_day) % 7; #adjust for $first_day
$title = htmlentities(ucfirst($month_name)).'&nbsp;'.$year; #note that some locales don't capitalize month and day names

#Begin calendar. Uses a real <caption>. See http://diveintomark.org/archives/2002/07/03
@list($p, $pl) = each($pn); @list($n, $nl) = each($pn); #previous and next links, if applicable
if($p) $p = '<span class="calendar-prev">'.($pl ? '<a href="'.htmlspecialchars($pl).'">'.$p.'</a>' : $p).'</span>&nbsp;';
if($n) $n = '&nbsp;<span class="calendar-next">'.($nl ? '<a href="'.htmlspecialchars($nl).'">'.$n.'</a>' : $n).'</span>';
$calendar = '<table class="calendar">'."n".
'<caption class="calendar-month">'.$p.($month_href ? '<a href="'.htmlspecialchars($month_href).'">'.$title.'</a>' : $title).$n."</caption>n<tr>";

if($day_name_length){ #if the day names should be shown ($day_name_length > 0)
#if day_name_length is >3, the full name of the day will be printed
foreach($day_names as $d)
$calendar .= '<th abbr="'.htmlentities($d).'">'.htmlentities($day_name_length < 4 ? substr($d,0,$day_name_length) : $d).'</th>';
$calendar .= "</tr>n<tr>";
}

if($weekday > 0) $calendar .= '<td colspan="'.$weekday.'">&nbsp;</td>'; #initial 'empty' days
for($day=1,$days_in_month=gmdate('t',$first_of_month); $day<=$days_in_month; $day++,$weekday++){
if($weekday == 7){
$weekday = 0; #start a new week
$calendar .= "</tr>n<tr>";
}
if(isset($days[$day]) and is_array($days[$day])){
@list($link, $classes, $content) = $days[$day];
if(is_null($content)) $content = $day;
$calendar .= '<td'.($classes ? ' class="'.htmlspecialchars($classes).'">' : '>').
($link ? '<a href="'.htmlspecialchars($link).'">'.$content.'</a>' : $content).'</td>';
}
else $calendar .= "<td>$day</td>";
}
if($weekday != 7) $calendar .= '<td colspan="'.(7-$weekday).'">&nbsp;</td>'; #remaining "empty" days

// if url parameters are set, we generate some appropriate previous/next month (pn) links
if (isset($_GET['month']) && isset($_GET['year']) && isset($_GET['pn'])) {
// set month, year & previous or next (pn)
$month = (int)$_GET['month'];
$year = (int)$_GET['year'];
$pn = $_GET['pn'];
// if the month is btw 1 and 12 we incr for next and decr for previous
if($month > 1 && $month < 12){
$nxt = 'parser.php?pn=next&month='.((int)$_GET['month']+1).'&year='.$year;
$prv = 'parser.php?pn=prev&month='.((int)$_GET['month']-1).'&year='.$year;
} // In Dec the next month is Jan and the year is upped, the prev month is Nov and the year stays the same
if($month == 12){
$nxt = 'parser.php?pn=next&month=1&year='.($year+1);
$prv = 'parser.php?pn=prev&month=11&year='.$year;
} // In Jan the next month is Feb and the year stays the same, the prev month is Dec and the year is decr by one
if($month == 1){
$nxt = 'parser.php?pn=next&month=2&year='.$year;
$prv = 'parser.php?pn=prev&month=12&year='.($year-1);
}
} else { // otherwise we generate a calendar for the current month based on the current date & some (pn) links
// set current month & year
$month = (int)date('n', $time);
$year = (int)date('Y', $time);
// same conditional crap as above
if($month > 1 && $month < 12){
$nxt = 'parser.php?pn=next&month='.($month+1).'&year='.$year;
$prv = 'parser.php?pn=prev&month='.($month-1).'&year='.$year;
}
if($month == 12){
$nxt = 'parser.php?pn=next&month=1&year='.($year+1);
$prv = 'parser.php?pn=prev&month=11&year='.$year;
}
if($month == 1){
$nxt = 'parser.php?pn=next&month=2&year='.$year;
$prv = 'parser.php?pn=prev&month=12&year='.($year-1);
}
}

// array for our previous and next links
$pn = array('&laquo;'=>$prv, '&raquo;'=>$nxt);