Probléme d'insertion

<?php
if(isset($_POST['valider']))
{ $nom_usr=$_POST['nom_usr'];
  $prenom_usr=$_POST['pr_usr'];
  $login_usr=$_POST['login_usr'];
  $tel1=$_POST['tel1_usr'];
  $tel2=$_POST['tel2_usr'];
  $email_usr=$_POST['email_usr'];
  $sexe_usr=$_POST['sexe'];
  $role_usr=$_POST['role'];
  $mdp_hacher=sha1($_POST['password']);
  $etat=1;
// Connexion a la base de Données
include('bdcon.php');
$req =$bdd->prepare("SELECT email_user ,pass_user FROM users WHERE email_user=:email_usr AND pass_user=:password ");
$req->execute(
      array(
'email_usr'=> $email_usr,
'password' => $mdp_hacher
));
$resultat = $req->fetch();
if(!$resultat)
{
    require_once('bdcon.php');
    $bdd->exec('INSERT INTO users(nom_user,prenom_user,sexe_user,contact1_user,
    contact2_user,login_user,role_user,email_user,pass_user,etat_user)
                    VALUES
              ('.$nom_usr.', '.$prenom_usr.', '.$sexe_usr.','.$tel1.' ,'.$tel2.' ,'.$login_usr.',
       '.$role_usr.' ,'.$email_usr.' ,'.$mdp_hacher.', '.$etat.')');

    echo '<br>Nouveau utilisateur ajouté !';}
 else
   { echo'<br>Ce utilisateur existe déjà!';}
   }
?>