PHP計算兩個日期之間的天數

php_how_many_days_between_two_dates.php

<?php
//----- 計算兩個日期之間的天數 -----//

$startTimeStamp = strtotime("2011/07/01");
$endTimeStamp = strtotime("2011/07/17");

$timeDiff = abs($endTimeStamp - $startTimeStamp);

$numberDays = $timeDiff/86400;  // 86400 seconds in one day

// and you might want to convert to integer
$numberDays = intval($numberDays);

//----- 計算從某個時間到目前為止的天數 -----//

$today = date('Y/m/d'); //取得今天的日期
$startTimeStamp = strtotime("2012/09/09");
$endTimeStamp = strtotime($today);

$timeDiff = abs($endTimeStamp - $startTimeStamp);

$numberDays = $timeDiff/86400;  // 86400 seconds in one day

// and you might want to convert to integer
$numberDays = intval($numberDays);