[Messagerie] function recup_conversation en pdo

<?php 
//la function qui va recuperer les conversations
function recup_conversation() {
 global $bdd; // déclaration globale de BDD

$pseudo_session = isset($_SESSION['pseudo'])?$_SESSION['pseudo'] : NULL;

$sql = "SELECT conversations.id_conversation,
                    conversations.sujet_conversation,
                    utilisateurs.pseudo,
                    utilisateurs.avatar,
                    conversations_messages.date_message
                    FROM conversations
                    LEFT JOIN conversations_messages ON conversations.id_conversation = conversations_messages.id_conversation
                    INNER JOIN conversations_membres ON conversations.id_conversation = conversations_membres.id_conversation
                    INNER JOIN utilisateurs ON utilisateurs.pseudo = conversations_messages.pseudo_exp
                    WHERE pseudo_dest = ':session_pseudo '
                    GROUP BY conversations.id_conversation
                    ORDER BY conversations_messages.date_message DESC";
					
					$params = array(':session_pseudo' =>$pseudo_session);
                    
					
$req = $bdd->prepare($sql);
$req->execute($params);
$resultat = $req->fetchall();

return $resultat;
}
?>

SELECT conversations.id_conversation,
                    conversations.sujet_conversation,
                    utilisateurs.pseudo,
                    utilisateurs.avatar,
                    conversations_messages.date_message
                    FROM conversations
                    LEFT JOIN conversations_messages ON conversations.id_conversation = conversations_messages.id_conversation
                    INNER JOIN conversations_membres ON conversations.id_conversation = conversations_membres.id_conversation
                    INNER JOIN utilisateurs ON utilisateurs.pseudo = conversations_messages.pseudo_exp
                    WHERE pseudo_dest = ':session_pseudo '
                    GROUP BY conversations.id_conversation
                    ORDER BY conversations_messages.date_message DESC

<?php 
include('functions/membre.func.php');
include('body/header.php');
include('body/menu.php');
?>
<h3>Les conversations</h3>
<?php 
$conversations = recup_conversation();
   if($conversations == true)
   {
        foreach($conversations as $conversation)
     {
      ?>
         <div class='conversation'>      
        <a href="index.php?page=profile&pseudo=<?php echo $conversation['pseudo']; ?>"><?php echo $conversation['pseudo']; ?></a><br />
     <omg src='avatar/<?php echo $conversation['avatar']; ?> height='70' width='70'>
     <p><a href=""> <?php echo $conversation['sujet_conversation'] ?></a></p>
     
                  </div>      
      <?php
     }
   }else{
    ?>
       <div class'error'>Vous n'avez pas de message</div>
    <?php
   }
?>

<omg src=""avatar/<?php echo $conversation['avatar']; ?> height='70' width='70'>

<IMG src='avatar/<?php echo $conversation['avatar']; ?>'  height='70' width='70'></IMG>