public function login($email,$password){
    $stmt=$this->pdo->prepare("SELECT 'user_id' from 'users' WHERE 'email'= :email  AND 'password'=:password");
    $stmt->bindParam(":email",  $email, PDO::PARAM_STR);
    $stmt->bindParam(":password",  md5($password) , PDO::PARAM_STR);
    $stmt->execute();
    $user=$stmt->fetch(PDO::FETCH_OBJ);
    $count=$stmt->rowCount();
    if($count > 0){
        $_SESSION['user_id'] = $user->user_id;
        header('Location: home.php');
    }else{
        return false;
    }
The count variable is always showing 0 on echoing in php even though my database has enteries and so even after entering the correct username and password I am not forwared to home.php page. What might be the problem?