if(!empty($errors)) {

            foreach($errors as $error) {

                echo validation_errors($error);
            }
        }
        else {

            if(register_user($first_name, $last_name, $username, $email, $password)) {

                set_message("<p class='bg-success text-center'>Please check your email or spam folder for activation link</p>");

                redirect("index.php");
            }
        }
    }//post

}//function

function register_user($first_name, $last_name, $username, $email, $password) {

    $first_name = escape($first_name);
    $last_name = escape($last_name);
    $username = escape($username);
    $emil = escape($email);
    $password = escape($password);

    if(email_exists($email)) {

        return false;
    }
    elseif(username_exists($username)) {

        return false;
    }
    else {

        $password = md5($password);

        $validation = md5($username + microtime());

        $sql = "INSERT INTO users(first_name, last_name, username, email, password, validation, active)";
        $sql.= " VALUES('$first_name', '$last_name', '$username', '$email', '$password', '$validation', 0)";
        $result = query($sql);
        confirm($result);

        return true;
    }

}//register