mysql insert success but nothing is added

look at this code

<?
require_once("conn.php");
require_once("include开发者_C百科s.php");
require_once("access.php");

if(isset($_POST[s1]))
{
    //manage files
    if(!empty($_FILES[images]))
    {
        while(list($key,$value) = each($_FILES[images][name]))
        {
            if(!empty($value))
            {
                $NewImageName = $t."_".$value;
                copy($_FILES[images][tmp_name][$key], "images/".$NewImageName);

                $MyImages[] = $NewImageName;
            }
        }

        if(!empty($MyImages))
        {
            $ImageStr = implode("|", $MyImages);
        }
    }

    $q1 = "insert into class_catalog set 
                                MemberID = '$_SESSION[MemberID]',
                                CategoryID = '$_POST[CategoryID]',
                                Description = '$_POST[Description]',
                                images = '$ImageStr',
                                DatePosted = '$t',
                                DateExp = '$_SESSION[AccountExpDate]',
                                FeaturedStatus = '$_POST[sp]' ";
//echo $q1;
    mysql_query($q1) or die(mysql_error());

}

//get the posted offers
$q1 = "select count(*) from class_catalog where MemberID = '$_SESSION[MemberID]' ";
$r1 = mysql_query($q1) or die(mysql_error());
$a1 = mysql_fetch_array($r1);



header("location:AddAsset.php");

exit();

?>

The mySql insert function isn't adding anything also it return success to me , I've tried using INSERT ... Values but what it done was overwtiting existing value ( i.e make 1 entry and overwties it everytime).

I am using PHP 4.4.9 and MySql 4

I tried to add from Phpmyadmin and it is working also it was working after installation but after i quit the browser and made a new account to test it it is not working but the old ones is working ! you can see it here http://bemidjiclassifieds.com/ try to login with usr:openbook pass:mohamed24 and you can see it will be working but any new account won't work!

Maybe $_POST[s1] is not set or you are inserting into a different database than you are watching.

if(isset($_POST[s1]))

should probably be

if(isset($_POST['s1']))

(note the quotes). Also, it's best to NOT depend on a field being present in the submitted data to check if you're doing a POSt. the 100% reliable method is

if ($_SERVER['REQUEST_METHOD'] == 'POST') { ... }

As well, you're not checking if the file uploads succeeded. Each file should be checked like this:

foreach($_FILES['images']['name'] as $key => $name) {
   if ($_FILES['images']['error'][$key] !== UPLOAD_ERR_OK) {
       echo "File #$key failed to upload, error code {$_FILES['images']['error'][$key]}";
   }
   ...
}

Don't use copy() to move uploaded files. There's a move_uploaded_files() function for that, which does some extra sanity checking to make sure nothing's tampered with the file between the time the upload finished and your script tries to move it.