php mktime函数获取今天开始和结束的时间截

//开始时间截

$start=mktime(0,0,0,date("m"),date("d"),date("Y"));

//结束时间截：
$end=mktime(0,0,0,date('m'),date('d')+1,date('Y'))-1;

//php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;
 
//php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'));
 
//php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'));

function get_period_time($type='day'){
    $rs = FALSE;
    $now = time();
    switch ($type){
        case 'day'://今天
            $rs['beginTime'] = date('Y-m-d 00:00:00', $now);
            $rs['endTime'] = date('Y-m-d 23:59:59', $now);
            break;
        case 'week'://本周
            $time = '1' == date('w') ? strtotime('Monday', $now) : strtotime('last Monday', $now);
            $rs['beginTime'] = date('Y-m-d 00:00:00', $time);
            $rs['endTime'] = date('Y-m-d 23:59:59', strtotime('Sunday', $now));
            break;
        case 'month'://本月
            $rs['beginTime'] = date('Y-m-d 00:00:00', mktime(0, 0, 0, date('m', $now), '1', date('Y', $now)));
            $rs['endTime'] = date('Y-m-d 23:39:59', mktime(0, 0, 0, date('m', $now), date('t', $now), date('Y', $now)));
            break;
        case '3month'://三个月
            $time = strtotime('-2 month', $now);
            $rs['beginTime'] = date('Y-m-d 00:00:00', mktime(0, 0,0, date('m', $time), 1, date('Y', $time)));
            $rs['endTime'] = date('Y-m-d 23:39:59', mktime(0, 0, 0, date('m', $now), date('t', $now), date('Y', $now)));
            break;
        case 'half_year'://半年内
            $time = strtotime('-5 month', $now);
            $rs['beginTime'] = date('Y-m-d 00:00:00', mktime(0, 0,0, date('m', $time), 1, date('Y', $time)));
            $rs['endTime'] = date('Y-m-d 23:39:59', mktime(0, 0, 0, date('m', $now), date('t', $now), date('Y', $now)));
            break;
        case 'year'://今年内
            $rs['beginTime'] = date('Y-m-d 00:00:00', mktime(0, 0,0, 1, 1, date('Y', $now)));
            $rs['endTime'] = date('Y-m-d 23:39:59', mktime(0, 0, 0, 12, 31, date('Y', $now)));
            break;
    }
    return $rs;
}