The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
GUPNP_TYPE_BOOLEAN
     (integer)
    GUPNP_TYPE_INT
     (integer)
    GUPNP_TYPE_LONG
     (integer)
    GUPNP_TYPE_DOUBLE
     (integer)
    GUPNP_TYPE_FLOAT
     (integer)
    GUPNP_TYPE_STRING
     (integer)
    GUPNP_SIGNAL_DEVICE_PROXY_AVAILABLE
     (integer)
    GUPNP_SIGNAL_SERVICE_PROXY_AVAILABLE
     (integer)
    GUPNP_SIGNAL_ACTION_INVOKED
     (integer)
    GUPNP_SIGNAL_NOTIFY_FAILED
     (integer)
    GUPNP_SIGNAL_SUBSCRIPTION_LOST
     (integer)
    GUPNP_CONTROL_ERROR_INVALID_ACTION
     (integer)
    GUPNP_CONTROL_ERROR_INVALID_ARGS
     (integer)
    GUPNP_CONTROL_ERROR_OUT_OF_SYNC
     (integer)
    GUPNP_CONTROL_ERROR_ACTION_FAILED
     (integer)