datetime 轉 week

//echo get_chinese_weekday(‘2014-05-26 00:11:12’);

public function get_chinese_weekday($datetime)
{
        $weekday  = date('w', strtotime($datetime));
        $weeklist = array('日', '一', '二', '三', '四', '五', '六');
        return '星期' . $weeklist[$weekday];
}

public function get_number_weekday($datetime)
{
        $weekday  = date('w', strtotime($datetime));
        $weeklist = array(7, 1, 2, 3, 4, 5, 6);
        return  $weeklist[$weekday];
}