php 获取给定日期的前一天日期_PHP_编程开发_程序员俱乐部

??? /**
???? *
???? * 获取给定日期的前一天
???? * @param string $date
???? * @return string $yesterday
???? */
??? public function getYesterday($date)
??? {
??? ??? if(empty($date))
??? ??? {
??? ??? ??? $yesterday = date("Y-m-d",strtotime("-1 day"));
??? ??? }else{
??? ??? ??? $arr = explode('-', $date);
??? ??? ??? $year = $arr[0];
??? ??? ??? $month = $arr[1];
??? ??? ??? $day = $arr[2];
??? ??? ??? $unixtime = mktime(0,0,0,$month,$day,$year)-86400;
??? ??? ??? $yesterday = date('Y-m-d',$unixtime);
??? ??? }
??? ???
??? ??? return $yesterday;
??? }