<?php
function TimeDivision ($t, $mode = "normal")
{
	$unitSecond     = '秒';
	$unitMinute     = '分';
	$unitHour       = '時間';
	$unitDay        = '日';
	$unitMonth      = 'ヶ月';
	$unitYear       = '年';

	$divTime = $t - time ();
	if ($divTime < 60)
		return sprintf ('%d%s', $divTime, $unitSecond); // 秒
	$divTime /= 60;
	if ($divTime < 60)
		return sprintf ('%d%s', $divTime, $unitMinute); // 分
	$divTime /= 60;
	if ($divTime < 24)
		return sprintf ('%d%s', $divTime, $unitHour); // 時間

	$divTime /= 24;
	if ($divTime < 30 || $mode == "days")
		return sprintf ('%d%s', $divTime, $unitDay); // 日

	$divTime2 = $divTime % 30; $divTime /= 30;
	if ($divTime < 12)
		if (0 < $divTime2 && $mode == "complex")
			return sprintf ('%d%s%d%s', $divTime, $unitMonth, $divTime2, $unitDay); // 月＋日
		else
			return sprintf ('%d%s', $divTime, $unitMonth); // 月

	$divTime2 = $divTime % 12; $divTime /= 12;
	if (0 < $divTime2 && $mode == "complex")
		return sprintf ('%d%s%d%s', $divTime, $unitYear, $divTime2, $unitMonth); // 年＋月
	return sprintf ('%d%s', $divTime, $unitYear); // 年
}
echo TimeDivision (strtotime ("+40 day")), "
";
echo TimeDivision (strtotime ("+40 day"), "days"), "
";
echo TimeDivision (strtotime ("+40 day"), "complex"), "
";
?>