取本周第一天的日期 每周第一天是星期几

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取本周第一天的日期 每周第一天是星期几

 * 设置每周第一天是星期几
  * @param string $week 星期0-6
  * @return void
  */
 public function setFirstDayOfWeek($week = 1) {
  $this->firstDayOfWeek = $week;
 }
 

/**
  * 取本周第一天的日期
  * @return string
  */
 public function getFirstDayOfWeek ($format='') {
  $todayOfWeek = $this->getPart('w');
  
  /* 此处还有问题 */
  $firstDay = $this->add($this->firstDayOfWeek-$todayOfWeek,'dd',$format);
  return $firstDay;
 }