Warning: Cannot modify header information - headers already sent by

**linux_sql** · 13/04/2011, 02h16

Salut a tous,

j'obtiens cette erreur la :

Warning: Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/forum/authentification.php:10) in /Applications/MAMP/htdocs/forum/authentification.php on line 38

Voici mon code :

Code :

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Document sans nom</title>
</head>
<body>
<h1>Authentification</h1>
 
<?php
if (isset($_POST['valider']))
{
$login= $_POST['login'];
$password= $_POST['password'];
 
$password = md5($password);
 
$pdo_options[PDO::ATTR_ERRMODE] = PDO::ERRMODE_EXCEPTION;
$bdd = new PDO('mysql:host=localhost; dbname=forum', 'root', 'root', $pdo_options);
 
 
$req = $bdd->prepare
	("	SELECT password
		FROM users where username='$login'");
 
$req->execute();
 
$mdp = $req->fetchAll(PDO::FETCH_ASSOC);
 
$password_md5 = $mdp[0]['password'];
 
if($password_md5 != $password)
{
echo "erreur de mot de saisie";
}
else
{
header("Location: index2.php");
}
}
?>
<form id="authentification" method="post">
<label>Username: </label>
<input id="login" name="login" type="text" />
<label>Password: </label>
<input id="password" name="password" type="text" />
<input type="submit" name="valider"/>
</form>
 
 
</body>
</html>