double submit problem

[Psychomantum]

If I understand your problem, this might help:

// check to see if any post data was submitted
if (count($_POST) > 0 )
{
    // see if the post is the same as the one we just received
    if ($_SESSION['post_hash'] == md5(serialize($_POST)))
    {
        // if it is kill it by reseting the $_POST array
        $_POST = array();
    }
    else
    {
        // if not, set 'post_hash' to a string that represents the posted data
        $_SESSION['post_hash'] = md5(serialize($_POST));    

        // add your normal validation and insert code here
        //
        //
    }
}