data就可以获取英文的星期比如：Sunday
date("l");这个可以获取数字星期比如123，注意0是星期日
date("w");
获取中文星期几：
$weekarray = array("日","一","二","三","四","五","六"); //先定义一个数组
$weekarray[date("w")];
获取指定日期是：
$weekarray = array("日","一","二","三","四","五","六");
$weekarray[date("w",strtotime("2011-11-11"))];自定义函数
function getWeek($time = 0) {
$week_array = array('日', '一', '二', '三', '四', '五', '六'); //先定义一个数组
if ($time) {
return '星期' .$week_array[date('w',$time)];
} else {
return '星期' .$week_array[date('w')];
}
}
//调用
echo getWeek();
//输出：星期三