php 获取日期(当天，前天，明天，本周，本月，本季度，本年)

$begin_day = date("Y-m-d 00:00:00");
$end_day = date("Y-m-d 23:59:59");
$last_begin = date("Y-m-d 00:00:00",strtotime("last days"));
$last_end = date("Y-m-d 23:59:59",strtotime("last days"));
$next_begin = date("Y-m-d 00:00:00",strtotime("next days"));
$next_end = date("Y-m-d 23:59:59",strtotime("next days"));
$month_times = strtotime(date("Y-m"));
$monthday = date("t");
$month = date("n");
$begin_this_week=date("Y-m-d 00:00:00",strtotime("last Sunday +1 day"));
$end_this_week=date("Y-m-d 23:59:59",strtotime("next Sunday"));
$begin_this_month=date('Y-m-01 00:00:00');
$end_this_month=date("Y-m-$monthday 23:59:59",strtotime("this month",$month_times));
if($month==1 || $month==2 ||$month==3){
$begin_this_quarter=date('Y-01-01 00:00:00');
$end_this_quarter=date("Y-03-31 23:59:59");
}elseif($month==4 || $month==5 ||$month==6){
$begin_this_quarter=date('Y-04-01 00:00:00');
$end_this_quarter=date("Y-06-30 23:59:59");
}elseif($month==7 || $month==8 ||$month==9){
$begin_this_quarter=date('Y-07-01 00:00:00');
$end_this_quarter=date("Y-09-30 23:59:59");
}else{
$begin_this_quarter=date('Y-10-01 00:00:00');
$end_this_quarter=date("Y-12-31 23:59:59");
}
$begin_this_year=date('Y-01-01 00:00:00');
$end_this_year=date('Y-12-31 23:59:59');
//一季度是1月1日到3月31日；二季度是4月1日到6月30；三季度是7月1到9月30；四季度是10月1到12月31
echo "当天 | ";
echo "前天 | ";
echo "明天 | ";
echo "本周 | ";
echo "本月 | ";
echo "本季度 | ";
echo "本年 ";