连接脚本

Here is my connection script. I have a form on another page which brings the username and password of the user. I don't get why it always says wrong password or username.

 <?php
 include('functions.php');//*functions = working

  $user = $_POST['user'];
  $pass_hash = md5($_POST['pass']);
  $bdd = connPDO();

  connPDO();//*DB connection functions = working
  $req = $bdd->prepare('SELECT Id FROM users WHERE pseudo = :user AND pass =     
  :pass');
  $req->execute(array(
  'user' => $user,
  'pass' => $pass_hash));

 $result = $req->fetch();

 if (!$result)
 {
  echo 'Wrong username or password !';
 }
 else
 {
  session_start();
  $_SESSION['id'] = $resultat['id'];
  $_SESSION['user'] = $user;
  echo 'You have successfully logged in !';
 }
?> 

You forgot : in the parameters:

  $req->execute(array(
  ':user' => $user,
   ^----here
  ':pass' => $pass_hash));
   ^----here