php时间差计算

function getHour($addtime)
{
    $nowtime=date("Y-m-d H:i:s");
     
    echo datediff('n',$addtime,$nowtime,false);
}

function datediff($interval, $datefrom, $dateto, $using_timestamps = false) {
/*
$interval can be:
yyyy - Number of full years
q - Number of full quarters
m - Number of full months
y - Difference between day numbers
(eg 1st Jan 2004 is “1″, the first day. 2nd Feb 2003 is “33″. The datediff is “-32″.)
d - Number of full days
w - Number of full weekdays
ww - Number of full weeks
h - Number of full hours
n - Number of full minutes
s - Number of full seconds (default)
*/

if (!$using_timestamps) {
$datefrom = strtotime($datefrom, 0);
$dateto = strtotime($dateto, 0);
}
$difference = $dateto - $datefrom; // Difference in seconds

switch($interval) {

case 'yyyy': // Number of full years

$years_difference = floor($difference / 31536000);
if (mktime(date('H', $datefrom), date('i', $datefrom), date('s', $datefrom), date('n', $datefrom), date('j', $datefrom), date('Y', $datefrom)+$years_difference) > $dateto) {
$years_difference–;
}
if (mktime(date('H', $dateto), date('i', $dateto), date('s', $dateto), date('n', $dateto), date('j', $dateto), date('Y', $dateto)-($years_difference+1)) > $datefrom) {
$years_difference++;
}
$datediff = $years_difference;
break;

case "q": // Number of full quarters

$quarters_difference = floor($difference / 8035200);
while (mktime(date('H', $datefrom), date('i', $datefrom), date('s', $datefrom), date('n', $datefrom)+($quarters_difference*3), date('j', $dateto), date('Y', $datefrom)) < $dateto) {
$months_difference++;
}
$quarters_difference–;
$datediff = $quarters_difference;
break;

case 'm': // Number of full months

$months_difference = floor($difference / 2678400);
while (mktime(date('H', $datefrom), date('i', $datefrom), date('s', $datefrom), date('n', $datefrom)+($months_difference), date('j', $dateto), date('Y', $datefrom)) < $dateto) {
$months_difference++;
}
$months_difference–;
$datediff = $months_difference;
break;

case 'y': // Difference between day numbers

$datediff = date('z', $dateto) - date('z', $datefrom);
break;

case 'd': // Number of full days

$datediff = floor($difference / 86400);
break;

case 'w': // Number of full weekdays

$days_difference = floor($difference / 86400);
$weeks_difference = floor($days_difference / 7); // Complete weeks
$first_day = date('w', $datefrom);
$days_remainder = floor($days_difference % 7);
$odd_days = $first_day + $days_remainder; // Do we have a Saturday or Sunday in the remainder?
if ($odd_days > 7) { // Sunday
$days_remainder–;
}
if ($odd_days > 6) { // Saturday
$days_remainder–;
}
$datediff = ($weeks_difference * 5) + $days_remainder;
break;

case 'ww': // Number of full weeks

$datediff = floor($difference / 604800);
break;

case 'h': // Number of full hours

$datediff = floor($difference / 3600);
break;

case 'n': // Number of full minutes

$datediff = floor($difference / 60);
break;

default: // Number of full seconds (default)

$datediff = $difference;
break;
}

return $datediff;

}