使用PHP查找工作日，周和年的日期

Question

I have a day of the week number 'N' (1 for Monday through 7 Saturday) and a week 'W' and a year 'Y'.

How can i find the date?

Day of the week: 4 Week: 35 Year: 2014

Should output: 2014-08-28 (Thursday)

I have tried using strotime() without any luck. I cannot seem to find a way to specify the week and year, together with the weekday number.

Answer 1

You can use DateTime's setISODate() method for exactly this purpose. Your solution is almost right, but I don't understand why you're not supplying the weekday argument right from the start.

function get_date($weekday, $week, $year) {
    return (new DateTime())->setISODate($year, $week, $weekday)->format('Y-m-d');
}

var_dump(get_date(4, 35, 2014));