chamilo / chamilo-lms

     * @param int User id

     * @return bool True if user id was found, false otherwise

     */

    public static function is_user_id_valid($userId)

    {

        $resultData = Database::select(

            'COUNT(1) AS count',

            Database::get_main_table(TABLE_MAIN_USER),

            [

                'where' => ['id = ?' => intval($userId)]

            ],

            'first'

        );

        if ($resultData === false) {

            return false;

        }

        return $resultData['count'] > 0;

    }

    /**

     * Checks whether a given username matches to the specification strictly. The empty username is assumed here as invalid.

     *

     * @return boolean

     */

    public static function nameExists($name)

    {

        $resultData = Database::select(

            'COUNT(1) AS count',

            Database::get_main_table(TABLE_MAIN_CHAT_VIDEO),

            [

                'where' => ['room_name = ?' => $name]

            ],

            'first'

        );

        if ($resultData !== false) {

            return $resultData['count'] > 0;

        }

        return false;

    }

}