Log In User always fails even when i know that the mysql database is registering the login informati

Question

ok here is my issue. im setting up a login page for my site. i have my other pages restriced to access without the session validated. i register a test user and when i input the info into the correct fields it redirects back on itself and says accessdenied. i know the registration page is updating my mysql tables but it wont let me log in. also right after i create the server side behaviour i get a syntax error on line 2 and exclamation points next to Log In User plus log in user shows up twice in the behaviours panel. below is the form and php script
<?php
@@UrlFormat@@('Connections/tonyreaper.php');
// *** Start the session
session_start();
// *** Validate request to log in to this site.
$FF_LoginAction = $PHP_SELF;
if (isset($QUERY_STRING) && $QUERY_STRING!="") $FF_LoginAction .= "?".$QUERY_STRING;
if (isset($user_name)) {
  $FF_valUsername=$user_name;
  $FF_fldUserAuthorization="";
  $FF_redirectLoginSuccess="index.php";
  $FF_redirectLoginFailed="login.php";
  $FF_rsUser_Source="SELECT user_name, password ";
  if ($FF_fldUserAuthorization != "") $FF_rsUser_Source .= "," . $FF_fldUserAuthorization;
  $FF_rsUser_Source .= " FROM users WHERE user_name='" . $FF_valUsername . "' AND password='" . $password . "'";
  mysql_select_db($database_tonyreaper, $tonyreaper);
  $FF_rsUser=mysql_query($FF_rsUser_Source, $tonyreaper) or die(mysql_error());
  $row_FF_rsUser = mysql_fetch_assoc($FF_rsUser);
  if(mysql_num_rows($FF_rsUser) > 0) {
    // username and password match - this is a valid user
    $MM_Username=$FF_valUsername;
    session_register("MM_Username");
    if ($FF_fldUserAuthorization != "") {
      $MM_UserAuthorization=$row_FF_rsUser[$FF_fldUserAuthorization];
    } else {
      $MM_UserAuthorization="";
    session_register("MM_UserAuthorization");
    if (isset($accessdenied) && false) {
      $FF_redirectLoginSuccess = $accessdenied;
    mysql_free_result($FF_rsUser);
    session_register("FF_login_failed");
$FF_login_failed = false;
    header ("Location: $FF_redirectLoginSuccess");
    exit;
  mysql_free_result($FF_rsUser);
  session_register("FF_login_failed");
  $FF_login_failed = true;
  header ("Location: $FF_redirectLoginFailed");
  exit;
?>
<form action="<?php echo $FF_LoginAction?>" id="form1" name="form1" method="POST">
       <p> </p>
       <table width="200" border="0">
         <tr>
           <td>Username:</td>
           <td><label for="user_name"></label>
            <input type="text" name="user_name" id="user_name" /></td>
         </tr>
         <tr>
           <td>Password:</td>
           <td><span id="sprypassword1">
           <label for="password"></label>
           <input type="password" name="password" id="password" />
           <span class="passwordRequiredMsg">A value is required.</span><span class="passwordInvalidStrengthMsg">The password must have at least 5 letters and 1 number.</span></span></td>
         </tr>
         <tr>
           <td> </td>
           <td><input type="submit" name="submit" id="submit" value="Log In" /></td>
         </tr>
       </table>
       <p> </p>
     </form>
im really trying to get this fixed but i am at an utter loss

Answer 1

The $user_name has not been set, thus the login will always fail.
Have a look this example http://forums.adobe.com/message/3795422#3795422 where I have used
if (isset($_POST['user_name'])) {
Gramps