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 openal_listener_get    (PECL) openal_listener_get -- 
     Retrieve a listener property
     说明mixed  openal_listener_get ( int property ) 参数- 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)).
        
 返回值
     Returns a float or array of floats (as appropriate), or FALSE on failure.
     
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