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[photocalendar.git] / php-calendar.lib.php
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<?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
 
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
 
        return $calendar."</tr>\n</table>\n";
}
?>