HyperProxmox/code/web/backend/application/model/UserRoleModel.php

<?php

/**
 * Class UserRoleModel
 *
 * This class contains everything that is related to up- and downgrading accounts.
 */
class UserRoleModel
{
	/**
	 * Upgrades / downgrades the user's account. Currently it's just the field user_account_type in the database that
	 * can be 1 or 2 (maybe "basic" or "premium"). Put some more complex stuff in here, maybe a pay-process or whatever
	 * you like.
	 *
	 * @param $type
	 *
	 * @return bool
	 */
	public static function changeUserRole($type)
	{
		if (!$type) {
			return false;
		}

		// save new role to database
		if (self::saveRoleToDatabase($type)) {
			Session::add('feedback_positive', Text::get('FEEDBACK_ACCOUNT_TYPE_CHANGE_SUCCESSFUL'));
			return true;
		} else {
			Session::add('feedback_negative', Text::get('FEEDBACK_ACCOUNT_TYPE_CHANGE_FAILED'));
			return false;
		}
	}

	/**
	 * Writes the new account type marker to the database and to the session
	 *
	 * @param $type
	 *
	 * @return bool
	 */
	public static function saveRoleToDatabase($type)
	{
		// if $type is not 1 or 2
		if (!in_array($type, [1, 2])) {
			return false;
		}

		$database = DatabaseFactory::getFactory()->getConnection();

		$query = $database->prepare("UPDATE users SET user_account_type = :new_type WHERE user_id = :user_id LIMIT 1");
		$query->execute(array(
			':new_type' => $type,
			':user_id' => Session::get('user_id')
		));

		if ($query->rowCount() == 1) {
			// set account type in session
			Session::set('user_account_type', $type);
			return true;
		}

		return false;
	}
}