Problème Requête SQL !

<?php
session_start();
$bdd = new PDO('mysql:host=127.0.0.1;dbname=test', 'root', '');
if (isset($_SESSION['pseudo'])) {

  $requser = $bdd->prepare('SELECT * FROM membres WHERE id=$_SESSION['id']');
  $userinfo = $requser->fetch();
}
?>
<nav class="navbar navbar-default">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Serveur</a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="./index.php">Accueil <span class="sr-only">(current)</span></a></li>
        <li><a href="./staff.php">Staff</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">+ Plus <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="./online.php">En Ligne</a></li>
            <li><a href="./banlist.php">Ban-List</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="./dynmap.php">DynMap</a></li>
          </ul>
        </li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <?php if (isset($_SESSION['pseudo'])) {
echo $_SESSION['id'];
              ?>
        <p class="navbar-text">Bienvenue, <?php echo $_SESSION['pseudo'] ?></p>
        <?php } ?>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"><span class="glyphicon glyphicon-user" aria-hidden="true"></span><span class="caret"></span></a>
          <ul class="dropdown-menu">
            <?php if (isset($_SESSION['pseudo'])) {

              ?>
             <center><img src="https://cravatar.eu/helmhead/<?php echo $_SESSION['pseudo'] ?>/100.png" ?></img></center>
             <p><center><strong>Tokens: <?php echo $token ?></strong></center></p>
             <hr>
              <li><a href="./profil.php?id=<?php echo $_SESSION['id'] ?>">Mon Profil</a></li>
              <li><a href="./deconnexion.php">Déconnexion</a></li>
            <?php } else { ?>
            <li><a href="./inscription.php">S'Inscrire</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="./connexion.php">Se Connecter</a></li>
            <?php } ?>
          </ul>
        </li>
      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>