//开始时间
$begin_time = date("Y-m-d 00:00:00",time());
$today = strtotime($begin_time);

var_dump($begin_time);
echo $today;

//结束时间
$end_time = date("Y-m-d 23:59:60", time());
$strtotime = strtotime($end_time);

var_dump($end_time);
echo $strtotime;