分享一段php获取随意时间的前一天代码

<?php/*** 获取给定日期的前一天* @param string $date* @return string $yesterday*/function getYesterday($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;}