(PECL openal >= 0.1.0)
openal_listener_get — Retrieve a listener property
property
Property to retrieve, one of:
AL_GAIN (float),
AL_POSITION (array(float,float,float)),
AL_VELOCITY (array(float,float,float)) 和
AL_ORIENTATION (array(float,float,float)).
Returns a float or array of floats (as appropriate) 或者在失败时返回 FALSE.