PHPの日付関連クラス「DateInterval」 こんなクラス知りませんでした（笑）。精進が足りないと痛感した一日となりました。
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// P: period
// Y: years
// M: months
// D: days
// T: time
// H: hours
// M: minutes
// S: seconds
$duration = new DateInterval("P1Y2M3DT4H5M6S");
print_r($duration);
DateInterval Object
(
[y] => 1
[m] => 2
[d] => 3
[h] => 4
[i] => 5
[s] => 6
[weekday] => 0
[weekday_behavior] => 0
[first_last_day_of] => 0
[invert] => 0
[days] =>
[special_type] => 0
[special_amount] => 0
[have_weekday_relative] => 0
[have_special_relative] => 0
)
