//设置中国时区

 date_default_timezone_set('PRC');

 //今天的时间搓

 $today_start = strtotime(date('Y-m-d',time()).' 0:0:0');

 $today_end  = strtotime(date('Y-m-d',time()).' 23:59:59');

 //昨天的时间戳

 $yesterday_start = strtotime('-1 day'.' 0:0:0');

 $yesterday_end = strtotime('-1 day'.' 23:59:59');

 //查看上个月日期

 $first_day_of_month = date('Y-m',time()).'-01 00:00:01';

 $t = strtotime($first_day_of_month);

 date('Y-m',$t);

 date('Y-m',strtotime('- 1 month',$t));

 date('Y-m',strtotime('- 2 month',$t));

 //获取时间戳

 方法一：

 $yesterday_s = mktime(0,0,0,date('m'),date('d')-1,date('Y'));//昨天开始的时间搓

 $yesterday_e = mktime(23,59,59,date('m'),date('d')-1,date('Y'));//昨天结束的时间搓

 $tenday_s = mktime(0,0,0,date('m'),date('d')-10,date('Y'));//10天前开始的时间戳

 $tenday_e = mktime(23,59,59,date('m'),date('d')-10,date('Y'));//10天前结束的时间戳

 //方法二：

 $yesterday_s = strtotime(date("Y-m-d",strtotime("-10 day")).' 0:0:0'); //10天前开始的时间戳

 $yesterday_e = strtotime(date("Y-m-d",strtotime("-10 day")).' 23:59:59');//10天前结束的时间戳

 //方法三：

 $day = $_REQUEST['day'];//需要统计的日期

 $time_s = strtotime($day.' 0:0:0');

 $time_e = strtotime($day.' 23:59:59');

 //获取本周一的时间戳

 strtotime(date("Y-m-d",strtotime("-1 week Monday")));

 //获取今日开始时间戳和结束时间戳

 $beginToday = mktime(0,0,0,date('m'),date('d'),date('Y'));

 $endToday = mktime(0,0,0,date('m'),date('d')+1,date('Y'))-1; 

 //获取昨日起始时间戳和结束时间戳

 $beginYesterday = mktime(0,0,0,date('m'),date('d')-1,date('Y'));

 $endYesterday = mktime(0,0,0,date('m'),date('d'),date('Y'))-1; 

 //获取本周起始时间戳和结束时间戳

 $beginThisweek = mktime(0,0,0,date('m'),date('d')-date('w')+1,date('y'));

 $endThisweek = time();  

 //获取上周起始时间戳和结束时间戳

 $beginLastweek = mktime(0,0,0,date('m'),date('d')-date('w')+1-7,date('Y'));

 $endLastweek = mktime(23,59,59,date('m'),date('d')-date('w')+7-7,date('Y')); 

 //获取本月起始时间戳和结束时间戳

 $beginThismonth = mktime(0,0,0,date('m'),1,date('Y'));

 $endThismonth = mktime(23,59,59,date('m'),date('t'),date('Y'));

  //上个月的起始时间:

 $begin_time = strtotime(date('Y-m-01 00:00:00',strtotime('-1 month')));

 $end_time = strtotime(date("Y-m-d 23:59:59", strtotime(-date('d').'day')));  

 $begin_year = strtotime(date("Y",time())."-1"."-1"); //本年开始

 $end_year = strtotime(date("Y",time())."-12"."-31"); //本年结束 

 //现在的时间到第二天凌晨相差的时间戳

 $time = (strtotime(date('Y-m-d'))+3600*24) - time() ;