(PECL gupnp >= 0.1.0)
gupnp_service_introspection_get_state_variable — Returns the state variable data
$introspection
   , string $variable_name
   )
   Returns the state variable data by the name variable_name in this service.
  
introspectionA introspection identifier.
variable_nameThe name of the variable to retreive.
   Return the state variable data or FALSE.