Sessions qui marchent à moitié

[PetitMonstre]

Mon form de connection c'est sa :

Code PHP :

<?php

// *** Validate request to login to this site.

if (!isset($_SESSION)) {

  session_start();

}



$loginFormAction = $_SERVER['PHP_SELF'];

if (isset($_GET['accesscheck'])) {

  $_SESSION['PrevUrl'] = $_GET['accesscheck'];

}



if (isset($_POST['username'])) {

  $loginUsername=$_POST['username'];

  $password=$_POST['password'];

  $MM_fldUserAuthorization = "";

  $MM_redirectLoginSuccess = "Jeu.php";

  $MM_redirectLoginFailed = "index.php";

  $MM_redirecttoReferrer = false;

  mysql_select_db($database_space_conquest, $space_conquest);

  

  $LoginRS__query=sprintf("SELECT username, password FROM inscription_users WHERE username=%s AND password=%s",

    GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text")); 

   

  $LoginRS = mysql_query($LoginRS__query, $space_conquest) or die(mysql_error());

  $loginFoundUser = mysql_num_rows($LoginRS);

  if ($loginFoundUser) {

     $loginStrGroup = "";

    

    //declare two session variables and assign them

    $_SESSION['MM_Username'] = $loginUsername;

    $_SESSION['MM_UserGroup'] = $loginStrGroup;          



    if (isset($_SESSION['PrevUrl']) && false) {

      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];    

    }

    header("Location: " . $MM_redirectLoginSuccess );

  }

  else {

    header("Location: ". $MM_redirectLoginFailed );

  }

}

?>