/**
* Get the timestamp of the next upcoming Nth day of month.
*
* @param int $curdate The current occurrence's timestamp
* @param int|array $days_of_week Index(-es) of the possible day(s)-of-week the next instance may land on
* @param int|array $weeks_of_month Index(-es) of the possible week(s) of the month the next instance may land on
* @param int|array $months_of_year Index(-es) of the possible month(s) of the year the next instance may land on
*
* @return int|false The timestamp of the next occurrence on the nth day of the month or false
*/
private function getNthDayOfMonth($curdate, $days_of_week, $weeks_of_month, $months_of_year)
{
// Cast to arrays for consistency
$days_of_week = (array) $days_of_week;
$weeks_of_month = (array) $weeks_of_month;
$months_of_year = (array) $months_of_year;
// Obtain the hour, minute and second of $curdate for later comparison
$cur_hour = (int) date('G', $curdate);
$cur_minute = (int) date('i', $curdate);
$cur_second = (int) date('s', $curdate);
// Sort and rotate the arrays to give us a sensible starting point
$this->sort_and_rotate_int_array($days_of_week, (int) date('N', $curdate));
$this->sort_and_rotate_int_array($months_of_year, (int) date('n', $curdate));
sort($weeks_of_month);
$weeks_of_month = array_map('intval', $weeks_of_month);
// The next occurence must take place this year or the next applicable year
$year = (int) date('Y', $curdate);
$years = array($year, $year + $this->years_between);
// Examine each possible year and month
foreach ($years as $year) {
foreach ($months_of_year as $month) {
// If we are behind $curdate's month and year then keep advancing
if ($year <= date('Y', $curdate) && $month < date('n', $curdate)) {
continue;
}
foreach ($weeks_of_month as $nth_week) {
foreach ($days_of_week as $day) {
// Determine the date of the first of these days (ie, the date of the first Tuesday this month)
$start_of_month = mktime(0, 0, 0, $month, 1, $year);
$first_date = Tribe__Date_Utils::get_first_day_of_week_in_month($start_of_month, $day);
$day_of_month = (int) date('j', $first_date);
// Add the relevant number of weeks
$week = $nth_week > 0 ? $nth_week : abs($nth_week);
$direction = $nth_week > 0 ? 1 : -1;
$day_of_month = date('j', Tribe__Date_Utils::get_weekday_timestamp($day, $week, $month, $year, $direction));
// Form a timestamp representing this day of the week in the appropriate week of the month
$timestamp = mktime($cur_hour, $cur_minute, $cur_second, $month, $day_of_month, $year);
// If we got a valid timestamp that is ahead of $curdate, we have a winner
if ($timestamp && $timestamp > $curdate) {
return $timestamp;
}
}
}
}
}
// No match?
return false;
}
