php - 根据php中的开始日期计算日期并返回周数？

Question

我试图创建一个$start_date以参数为参数的函数，它应该计算我们所处的周数，即

例如 $start_date 等于2012-08-16

private function get_week_number($start_date){
        // get current date
        // caluculate the difference between start_date and current_date
        // determine which week we are in 1, 2 or 3
        // return $week 
    }

我怎样才能在php中实现这个？谢谢

Answer 1

我认为您需要的只是date_diff。

Answer 2

function get_week_number($start_date){
    $date = date('U', strtotime($start_date));
    $now = date('U');
    return ceil(($now-$date)/60/60/24/7);
}

echo get_week_number('2012-08-16');

Answer 3

private function get_week_number($start_date){
    return date('W') - date('W', strtotime($start_date)); 
}