String comparison issue in PHP

That's a ridiculous question but I am trying to figure out watch going one already for some time. I have the following PHP code in which actually I do a simple string comparison but it doesn't work:

    $db = new PDO('pgsql:dbname=login;user=postgres;password=postgres;host=localhost;port=5432');
if ($db) {

    // hash the password
    $hashed_password = md5($pword);
    //echo($hashed_password);
    //AND password =:password 
    $stmt = $db->prepare("SELECT * FROM members WHERE username =:username AND password =:password ");

    $stmt->bindParam('username', $uname,PDO::PARAM_INT); // bind $uname to parameter
    $stmt->bindParam('password', $hashed_password,PDO::PARAM_INT); // bind $uname to parameter
    $stmt->execute();

    $result = $stmt->fetch();
    $rights = $result['userRights'];
//====================================================
//  CHECK TO SEE IF THE $result VARIABLE IS TRUE
//====================================================
    if ($result) {
        //echo($rights);
        $num_rows = sizeof($result);

        if ($num_rows > 0) {
            //echo($rights);
            if($rights=="write"){
                echo $rights;
                //echo("write");
                //header('Location: http://www.google.com/');

            } 
            //if($result['userRights']=="write") {
                //echo("write");

                //session_start();
                //$_SESSION['login'] = "1";

                //header ("Location: indexx.php");  
            //} 
        }
        else {
            $errorMessage = "Error logging on";
        }   
    }
    else {
        $errorMessage = "Error logging on";
    }
}

else {
    $errorMessage = "Error logging on";
} 

}

Note: What I try to do is to implement a simple login/logout application. I know that some of the techniques I use are not best practices (e.g. MD5 hashing).