Bonjour,
J’ai bidouillé un petit espace administration avec une session_start pour l’identification.
Le problem c’est que je recois les messages erreur suivant :
Notice: A session had already been started - ignoring session_start() in
Warning: Cannot modify header information - headers already sent by (output started at
Qui peut m’aider à résoudre ce problème. Merci

Voici le code
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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<?php require_once('......'); ?>
<?php
//initialisation de la session
session_start();
// Logout
$logoutAction = $_SERVER['PHP_SELF']."?doLogout=true";
if ((isset($_SERVER['QUERY_STRING'])) && ($_SERVER['QUERY_STRING'] != "")){
  $logoutAction .="&". htmlentities($_SERVER['QUERY_STRING']);
}
if ((isset($_GET['doLogout'])) &&($_GET['doLogout']=="true")){
  session_unregister('MM_Username');
  session_unregister('MM_UserGroup');
 
  $logoutGoTo = "/admin/logout.php";
  if ($logoutGoTo) {
    header("Location: $logoutGoTo");
    exit;
  }
}
?>
<?php
// Validation login
session_start();
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($accesscheck)) {
  $GLOBALS['PrevUrl'] = $accesscheck;
  session_register('PrevUrl');
}
if (isset($_POST['username'])) {
  $loginUsername=$_POST['username'];
  $password=$_POST['password'];
  $MM_fldUserAuthorization = "level_usr";
  $MM_redirectLoginSuccess = "index.php";
  $MM_redirectLoginFailed = "login.php";
  $MM_redirecttoReferrer = true;
  mysql_select_db($database_BB, $BB);
 
  $LoginRS__query=sprintf("SELECT username_usr, password_usr, level_usr FROM blg_user_usr WHERE username_usr='%s' AND password_usr='%s'",
  get_magic_quotes_gpc() ? $loginUsername : addslashes($loginUsername), get_magic_quotes_gpc() ? $password : addslashes($password)); 
 
  $LoginRS = mysql_query($LoginRS__query, $connBlog) or die(mysql_error());
  $loginFoundUser = mysql_num_rows($LoginRS);
  if ($loginFoundUser) {
 
    $loginStrGroup  = mysql_result($LoginRS,0,'level_usr');
 
    $GLOBALS['MM_Username'] = $loginUsername;
    $GLOBALS['MM_UserGroup'] = $loginStrGroup;       
    session_register("MM_Username");
    session_register("MM_UserGroup");
    if (isset($_SESSION['PrevUrl']) && true) {
      $MM_redirectLoginSuccess = $_SESSION['PrevUrl']; 
    }
header("Location: " . $MM_redirectLoginSuccess );
  }
  else {
header("Location: ". $MM_redirectLoginFailed );
  }
}
?>