[PHP][HTML]Kalendarz w smarty. Opcje

[miras]

Witam, jestem w trakcie tworzenia kalendarza w smarty i mam następujący problem: 2 błędy:

Warning: array_keys() [function.array-keys]: The first argument should be an array in /sciezka/calendar.php on line 10

Warning: Invalid argument supplied for foreach() in /sciezka/calendar.php on line 10

calendar.php :

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			<?php
			include("libs/Smarty.class.php");
			$smarty = new smarty();
 
			$title=date("F").' '.date("Y");
			$date=date("d/m/Y");
			$week_days = array("Sat"=>1,"Sun"=>2,"Mon"=>3,"Tue"=>4,"Wed"=>5,"Thu"=>6,"Fri"=>7);
			$total_day_of_month = get_total_day($date);
			$starting_day = $week_days[Date("D", strtotime($date))] - 1;
			foreach (array_keys(week_days) as $day)
			$days[] = $day;
			for ($i=0; $i < $starting_day; $i++)
			$days[] = "&nbsp;";
			for ($i=1; $i< ($total_day_of_month+1); $i++)
			if (date("d")==$i) { $days[] = '<b>'.$i.'</b>'; } else { $days[] = $i; }
 
 
 
	$smarty->assign("title",$title);
	$smarty->assign("special_days", $days);
	$smarty->display("calendar.tpl");
 
					function get_total_day($date)
			{
				$time_stamp = strtotime($date);
				$month_ar = split("/", $date);
				$month = $month_ar[0];
				$year = Date("Y",$time_stamp);
				for ($i=28; $i<33; $i++)
				{
					if (!checkdate($month, $i, $year)) {
						return ($i - 1);
					}
				}
			}
 
			?>
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calendar.tpl

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   <b>{$title}</b>
{html_table loop=$special_days cols=7}
</body>
</html>
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co jest nie tak?