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(PECL openal >= 0.1.0)
openal_buffer_get — Retrieve an OpenAL buffer property
$buffer 
   ,  int $property 
   )buffer An Open AL(Buffer) resource (previously created by openal_buffer_create() ).
property 
      Specific property, one of:
       AL_FREQUENCY ,
       AL_BITS ,
       AL_CHANNELS  和 
       AL_SIZE .
     
   Returns an integer value appropriate to the property
   requested 或者在失败时返回  FALSE .