$time1 = strtotime('2017-12-30 12:12:04');
$time2 = strtotime('2018-1-25 21:34:45');
$number = $time2 - $time1;
$day = intval($number / (24 * 3600));
$number2 = $number % (24 * 3600);
$huors = intval($number2 / 3600);
$number3 = $number2 % 3600;
$mins = intval($number3 / 60);
$seconds = $number3 % 60;
echo $day.'天'.$huors.'时'.$mins.'分'.$seconds.'秒';
?>
结果是26天9时22分41秒
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