&reftitle.constants; &extension.constants;

`YAF_VERSION` (`string`)

`YAF_ENVIRON` (`string`)

`YAF_ERR_STARTUP_FAILED` (`int`)

`YAF_ERR_ROUTE_FAILED` (`int`)

`YAF_ERR_DISPATCH_FAILED` (`int`)

`YAF_ERR_AUTOLOAD_FAILED` (`int`)

`YAF_ERR_NOTFOUND_MODULE` (`int`)

`YAF_ERR_NOTFOUND_CONTROLLER` (`int`)

`YAF_ERR_NOTFOUND_ACTION` (`int`)

`YAF_ERR_NOTFOUND_VIEW` (`int`)

`YAF_ERR_CALL_FAILED` (`int`)

`YAF_ERR_TYPE_ERROR` (`int`)