This is an action that displays a single month calendar. It was written by modifying the generate_calendar() function by 
Kieth Devens.
For a demonstration, see:
http://www.lipsey.org/jim/wiki/CalenderDemo Link offline
requires PHP5
Invoke:{{calendar [year="2004|2005..."] [month="1|2|..."] [highlight="today|1|2|..."] [daywidth="3"]}}
/actions/calendar.php
<?php
# PHP Calendar (version 2.3), written by Keith Devens
# http://keithdevens.com/software/php_calendar
# see example at http://keithdevens.com/weblog
# License: http://keithdevens.com/software/license
# Adapted to Wiki action for WackoWiki by Jim Lipsey
# 20041207
# http://lipsey.org (no further documentation exists)
/* {{ calendar [year=2004|2005...] [month="1|2|..."] [highlight="today|1|2|..."] [daywidth="3"]}} */
/* stylesheet parameters:
.calendar (table container class)
.calendar_month (month heading format)
.calendar th (day of week headings)
.calendar tr td
*/
$time = time();
$current_year = date('Y', $time);
$current_month = date('n', $time);
$current_day = date('j', $time);
if (!$year) {
$year = $current_year;
}
if (!$month) {
$month = $current_month;
}
if ($highlight == "today") {
$days = array($current_day=>array(NULL,NULL,'<span style="color: red; font-weight: bold;">'.$current_day.'</span>'));
}
else if ($highlight) {
$days = array($highlight=>array(NULL,NULL,'<span style="color: red; font-weight: bold;">'.$highlight.'</span>'));
}
if (!$daywidth) {
$daywidth = 3;
}
if (function_exists('generate_calendar') == false) {
function generate_calendar($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)).' '.$year; #note that some locales don't capitalize month and day names
#Begin calendar. Uses a real <caption>. See http://diveintomark.org/archives/2002/07/03
@list($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>' : $p).'</span> ';
if($n) $n = ' <span class="calendar-next">'.($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.'"> </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).'"> </td>'; #remaining "empty" days
$calendar .= "</tr>\n</table>\n";
return $calendar;
}
}
echo generate_calendar($year, $month, $days, $daywidth);
?>
