Take the first day of the week the first day of the week is the week

Take the first day of the week the first day of the week is the week

* Set the first day of the week is the week
* @param string $week Week 0-6
* @return void
*/
Public Function Setfirstdayofweek ($week = 1) {
$this->firstdayofweek = $week;
}

/**
* Take the date of the first day of the week
* @return String
*/
Public Function Getfirstdayofweek ($format = ' ") {
$todayOfWeek = $this->getpart (' W ');

* * There is still a problem here.
$firstDay = $this->add ($this->firstdayofweek-$todayOfWeek, ' DD ', $format);
return $firstDay;
}