PHP add 1 month to date

Question

I\'ve a function that returns url of 1 month before.

I\'d like to display current selected month, but I cannot use simple current month, cause when user clicks link

Answer 1

there are 3 options/answers

     $givendate is the given date (ex. 2016-01-20)

option 1:
        $date1 = date('Y-m-d', strtotime($givendate. ' + 1 month'));

option 2:
        $date2 = date('Y-m-d', strtotime($givendate. ' + 30 days'));

option 3:
        $number = cal_days_in_month(CAL_GREGORIAN, date('m', strtotime($givendate)), date('Y', strtotime($givendate)));
        $date3 = date('Y-m-d', strtotime($date2. ' + '.$number.' days'));