計算日期之間的天數

Question

我想了解兩個日期之間有多少天的代碼波紋管是我所說的一個例子，但它不工作所有我在數據庫中得到的是0

 <?php 
    $hotel_name = $_POST['hotelName']; 
    $room_type = $_POST['roomType']; 
    //date From value 
    $dayfrom = $_POST['dayfrom']; 
    $monthfrom = $_POST['monthfrom']; 
    $yearfrom = $_POST['yearfrom']; 
    //date To value 
    $dayto  = $_POST['dayto']; 
    $monthto = $_POST['monthto']; 
    $yearto  = $_POST['yearto']; 
    $arivDate = sprintf('%04d-%02d-%02d', $yearfrom, $monthfrom, $dayfrom); 
    $depDate = sprintf('%04d-%02d-%02d', $yearto, $monthto, $dayto); 
    $child = $_POST['child']; 
    $adult = $_POST['adult']; 
    $days = $arivDate - $depDate; 
    //$sortedfromdate = strtotime($arivDate); 
    //$sortedtodate = strtotime($depDate); 
    $query = "INSERT INTO tempbooking(book_date, Ariv_date, dep_date, hotel_name 
      )VALUES(
      CURDATE(), '{$arivDate}', '{$depDate}', '{$hotel_name}')"; 
      if(mysql_query($query,$connection)){ 
         $booking_id = mysql_insert_id(); 
      }else{ 
      die("The Booking was not successful". mysql_error()); 
      } 
         $queryres="INSERT INTO ro_reservation(booking_id, children, adult, room_type, number_days 
           )VALUES(
            {$booking_id}, {$child}, {$adult}, '{$room_type}',{$days})"; 
         if(mysql_query($queryres,$connection)){ 
         header("Location:index.php"); 
         //echo"<a href=\"index.php\"> Reservation Inserted</a>"; 
         }else{ 
         echo "Nothing was inserted in to the ro_reservation"; 
         }   
?> 

Answer 1

$arivDate = strtotime("2012-01-01"); 
$depDate = strtotime("2012-08-14"); 
$datediff = abs($arivDate - $depDate) 
echo floor($datediff/(60*60*24));