1 /** 2 * 日期-获取当月最后一天 3 * @return int 4 */ 5 public function get_lastday() { 6 if($this->month==2) { 7 $lastday = $this->is_leapyear($this->year) ? 29 : 28; 8 } elseif($this->month==4 || $this->month==6 || $this->month==9 || $this->month==11) { 9 $lastday = 30;10 } else {11 $lastday = 31;12 }13 return $lastday;14 }15 16 17 18 /**19 * 日期-是否是闰年20 * @return int21 */22 public function is_leapyear($year) {23 return date('L', $year);24 }