function login($login, $pass)
	{
        $cnx = new PDO("sqlsrv:Server=SRVLYCJ;Database=dbLogin_resseguier", "Resseguier","Resseguier13");
		$select = "
		    SELECT user_id, username, userpassword
		    FROM usertable
		    WHERE username = '%s' AND userpassword = '%s';
			";

		$fixedlogin = $login;
		$fixedpass  = $pass;
		$query = sprintf($select, $fixedlogin, $fixedpass);
		$req = $cnx->prepare($query);

		$req->execute();
        // Récupération des résultats
		while ($row = $req->fetch(PDO::FETCH_OBJ))
		{
			$output[0] = $row->user_id;

		}

        if(empty($output[0]))
		{
			return -1;
		}
		else
		{
			return $output[0];
		}

    }