本年本月本日本周的起始时间戳

date_default_timezone_set("Asia/Shanghai"); //设置为上海时间 否则开始时间会相差8个小时  
 //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;  
echo $beginToday ."<br>";
echo $endToday ."<br>";

//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;  
echo $beginYesterday ."<br>";
echo $endYesterday ."<br>";
  
//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();  
echo $beginThisweek ."<br>";
echo $endThisweek ."<br>";
//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'));  
echo $beginLastweek ."<br>";
echo $endLastweek ."<br>"; 
//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'));  
echo $beginThismonth ."<br>";
echo $endThismonth ."<br>";  
 //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')));  
echo $begin_time ."<br>";
echo $end_time ."<br>";

  //本年开始结束
$begin_year = strtotime(date("Y",time())."-1"."-1"); //本年开始  
$end_year = strtotime(date("Y",time())."-12"."-31"); //本年结束  
echo $begin_year ."<br>";
echo $end_year ."<br>";  
//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() ;   
echo $time ."<br>";