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利用 strtotime()函數將字串資料轉為 timestamp，再進行計算
<?php
$time1 = "2013-12-02 10:00:00";
$time2 = "2013-11-02 10:00:00";
echo (strtotime($time1) - strtotime($time2)); //計算相差之秒數
echo (strtotime($time1) - strtotime($time2))/ (60); //計算相差之分鐘數
echo (strtotime($time1) - strtotime($time2))/ (60*60); //計算相差之小時數
echo (strtotime($time1) - strtotime($time2))/ (60*60*24); //計算相差之天數
?>
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