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Homephp教程php手册PHP下获取上个月、下个月、本月的日期

 因为工作需要需要获取上个月、下个月、本月的日期,特从网站找到了实现代码,特分享下,方便需要的朋友

今天写程序的时候,突然发现了很早以前写的获取月份天数的函数,经典的switch版,但是获得上月天数的时候,我只是把月份-1了,估计当时太困了吧,再看到有种毛骨悚然的感觉,本来是想再处理一下的,但是一想肯定还有什么超方便的方法,于是找到了下面这个版本,做了一点小修改。   获取本月日期:   代码如下: function getMonth($date){      $firstday = date("Y-m-01",strtotime($date));      $lastday = date("Y-m-d",strtotime("$firstday +1 month -1 day"));      return array($firstday,$lastday);  }     $firstday是月份的第一天,假如$date是2014-2这样的话,$firstday就会是2014-02-01,然后根据$firstday加一个月就是2014-03-01,再减一天就是2014-02-28,用date()和strtotime()真是太方便了。     获取上月日期:    代码如下: function getlastMonthDays($date){      $timestamp=strtotime($date);      $firstday=date('Y-m-01',strtotime(date('Y',$timestamp).'-'.(date('m',$timestamp)-1).'-01'));      $lastday=date('Y-m-d',strtotime("$firstday +1 month -1 day"));      return array($firstday,$lastday);  }     上月日期需要先获取一个时间戳,然后在月份上-1就OK了,超智能的date()会把2014-0-1这种东西转换成2013-12-01,太爽了。     获取下月日期:   代码如下: function getNextMonthDays($date){     $timestamp=strtotime($date);     $arr=getdate($timestamp);     if($arr['mon'] == 12){         $year=$arr['year'] +1;         $month=$arr['mon'] -11;         $firstday=$year.'-0'.$month.'-01';         $lastday=date('Y-m-d',strtotime("$firstday +1 month -1 day"));     }else{         $firstday=date('Y-m-01',strtotime(date('Y',$timestamp).'-'.(date('m',$timestamp)+1).'-01'));         $lastday=date('Y-m-d',strtotime("$firstday +1 month -1 day"));     }     return array($firstday,$lastday); }     下月日期的代码看起来比较长一点,因为date()转不了类似2014-13-01这种东西,它会直接回到1970,所以前面需要处理一下12月的问题,除了12月就直接月份+1就OK啦。   总得来说,还是很方便的,日期函数太强大了。  
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