PHP-获取一年中的上周编号 [英] PHP - get last week number in year

问题描述

请告诉我一年中的最后几周?

Tell me please how to get the last number of weeks in a year?

推荐答案

function getIsoWeeksInYear($year) {
    $date = new DateTime;
    $date->setISODate($year, 53);
    return ($date->format("W") === "53" ? 53 : 52);
}

o日期格式给出了 ISO-8601年号.我们可以使用它，并且无效"日期会自动转为有效日期(2011-02-31给出2011-03-03)这一事实，以确定给定的一年是否有53周.如果没有，则必须为52.

The o date format gives the ISO-8601 year number. We can use this, and the fact that "invalid" dates are automatically rolled around to make valid ones (2011-02-31 gives 2011-03-03), to determine if a given year has 53 weeks. If does not, then it must have 52.

另请参见 日期格式字符 和 查看全文