php 获取星期几的函数

function GetWeekDay($timeStamp=NULL)
{
	$arr = array(
	"1" => 星期一,
	"2" => 星期二,
	"3" => 星期三,
	"4" => 星期四,
	"5" => 星期五,
	"6" => 星期六,
	"7" => 星期日,
	);
	$week = date("N", $timeStamp);
	$i = (int) $week;
	return $arr[$i];
}