strtotime ("now")；

　　　　　　strtotime ("10 September 2017")；

　　　　　　strtotime ("+1 day")；

　　　　　　strtotime ("+1 week")；

　　　　　　strtotime ("+1 week 2 days 4 hours 2 seconds")；

　　　　　　strtotime ("next Thursday")；
　　　　　　strtotime ("last Monday")；

$times = [];
function makeTime(){
  //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;
  $times['today']['begin'] = $beginToday;
  $times['today']['end'] = $endToday;

  //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;
  $times['yesterday']['begin'] = $beginYesterday;
  $times['yesterday']['end'] = $endYesterday;

  //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'));
  $times['lastWeek']['begin'] = $beginLastweek;
  $times['lastWeek']['end'] = $endLastweek;

  //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'));
  $times['thisMonth']['begin'] = $beginThismonth;
  $times['thisMonth']['end'] = $endThismonth;

  //获取本周开始时间和结束时间，此例中开始时间为周一
  $defaultDate = date('Y-m-d');
  $first = 1;
  $w = date('w',strtotime($defaultDate));
  $beginWeek = strtotime("$defaultDate-" . ($w?$w-$first:6) . 'days');
  $endWeek = $beginWeek + 6*24*3600-1;
  $times['thisWeek']['begin'] = $beginWeek;
  $times['thisWeek']['end'] = $endWeek;

  //获取上月的起始时间戳和结束时间戳
  $beginLastmonth=mktime(0,0,0,date('m')-1,1,date('Y'));
  $endLastmonth=mktime(23,59,59,date('m')-1,date('t'),date('Y'));
  $times['LastMonth']['begin'] = $beginLastmonth;
  $times['LastMonth']['end'] = $endLastmonth;

  //获取今年的起始时间和结束时间
  $beginThisyear = mktime(0,0,0,1,1,date('Y'));
  $endThisyear = mktime(23,59,59,12,31,date('Y'));
  $times['thisYear']['begin'] = $beginThisyear;
  $times['thisYear']['end'] = $endThisyear;

  //获取上年的起始时间和结束时间
  $beginLastyear = mktime(0,0,0,1,1,date('Y')-1);
  $endLastyear = mktime(23,59,59,12,31,date('Y')-1);
  $times['lastYear']['begin'] = $beginLastyear;
  $times['lastYear']['end'] = $endLastyear;

  //获取本季度开始时间和结束时间
  $season = ceil((date('n'))/3);//当月是第几季度
  $beginThisSeason = mktime(0, 0, 0,$season*3-3+1,1,date('Y'));
  $endThisSeason = mktime(23,59,59,$season*3,date('t',mktime(0, 0 , 0,$season*3,1,date("Y"))),date('Y'));
  $times['thisSeason']['begin'] = $beginThisSeason;
  $times['thisSeason']['end'] = $endThisSeason;

  //获取上季度的起始时间和结束时间
  $beginLastSeason = mktime(0, 0, 0,($season-1)*3-3+1,1,date('Y'));
  $endLastSeason = mktime(23,59,59,($season-1)*3,date('t',mktime(0, 0 , 0,$season*3,1,date("Y"))),date('Y'));
  $times['lastSeason']['begin'] = $beginLastSeason;
  $times['lastSeason']['end'] = $endLastSeason;

  return $times;
}
$times = makeTime();