Modifier les variables de plusieurs champs !

<?php
    case "droits":
        //Gestion des droits
        echo'<h1>Edition des droits</h1>';     
       
        if(!isset($_POST['forum']))
        {
            $query=$db->query('SELECT forum_id, forum_name
            FROM forum_forum ORDER BY forum_ordre DESC');
            echo'<form method="post" action="admin.php?cat=forum&action=droits">';
            echo'<p>Choisir un forum :</br />
            <select name="forum">';
            while($data = $query->fetch())
            {
                echo'<option value="'.$data['forum_id'].'">'.$data['forum_name'].'</option>';
            }
            echo'<input type="submit" value="Envoyer"></p></form>';
            $query->CloseCursor();				  					
        }
        else
        {
	    $query = $db->prepare('SELECT forum_id, forum_name, auth_view,
	    auth_post, auth_topic, auth_annonce, auth_modo
	    FROM forum_forum WHERE forum_id = :forum');
	    $query->bindValue(':forum',(int) $_POST['forum'], PDO::PARAM_INT);
	    $query->execute();
 
            echo '<form method="post" action="adminok.php?cat=forum&action=droits"><p><table><tr>
	    <th>Lire</th>
	    <th>Répondre</th>
	    <th>Poster</th>
	    <th>Annonce</th>
	    <th>Modérer</th>
	    </tr>';
	    $data = $query->fetch();
		   
	    //Ces deux tableaux vont permettre d'afficher les résultats
	    $rang = array(
            VISITEUR=>"Visiteur",
            INSCRIT=>"Membre", 
            MODO=>"Modérateur",
            ADMIN=>"Administrateur");
	    $list_champ = array("auth_view", "auth_post", "auth_topic","auth_annonce", "auth_modo");
	 
	    //On boucle
	    foreach($list_champ as $champ)
	    {
	        echo'<td><select name="'.$champ.'">';
		for($i=1;$i<5;$i++)
		{
		    if ($i == $data[$champ])
		    {
		        echo'<option value="'.$i.'" selected="selected">'.$rang[$i].'</option>';
		    }	
		    else
		    {
		        echo'<option value="'.$i.'">'.$rang[$i].'</option>';
		    }
		}
		echo'</td></select>';
	    }	
	    echo'<br /><input type="hidden" name="forum_id" value="'.$data['forum_id'].'" />
	    <input type="submit" value="Envoyer"></p></form>';			          

            $query->CloseCursor();				  					

        }
        echo '</table>';
    break;
?>

	case "droits":    
        //Récupération d'informations
        $auth_view = (int) $_POST['auth_view'];
        $auth_post = (int) $_POST['auth_post'];
        $auth_topic = (int) $_POST['auth_topic'];
        $auth_annonce = (int) $_POST['auth_annonce'];
        $auth_modo = (int) $_POST['auth_modo'];
        
        //Mise à jour
        $query=$db->prepare('UPDATE forum_forum
        SET auth_view = :view, auth_post = :post, auth_topic = :topic,
        auth_annonce = :annonce, auth_modo = :modo WHERE forum_id = :id');
        $query->bindValue(':view',$auth_view,PDO::PARAM_INT);
        $query->bindValue(':post',$auth_post,PDO::PARAM_INT);
        $query->bindValue(':topic',$auth_topic,PDO::PARAM_INT);
        $query->bindValue(':annonce',$auth_annonce,PDO::PARAM_INT);
        $query->bindValue(':modo',$auth_modo,PDO::PARAM_INT);
		$query->bindValue(':id',(int) $_POST['forum_id'],PDO::PARAM_INT);
        $query->execute();
        $query->CloseCursor();
      
		header('Location: ./admin.php?cat=forum&action=droits');
		
    break;