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.
ALC_FREQUENCY
     (integer)
   ALC_REFRESH
     (integer)
   ALC_SYNC
     (integer)
   AL_FREQUENCY
     (integer)
   AL_BITS
     (integer)
   AL_CHANNELS
     (integer)
   AL_SIZE
     (integer)
   AL_BUFFER
     (integer)
   AL_SOURCE_RELATIVE
     (integer)
   AL_SOURCE_STATE
     (integer)
   AL_PITCH
     (integer)
   AL_GAIN
     (integer)
   AL_MIN_GAIN
     (integer)
   AL_MAX_GAIN
     (integer)
   AL_MAX_DISTANCE
     (integer)
   AL_ROLLOFF_FACTOR
     (integer)
   AL_CONE_OUTER_GAIN
     (integer)
   AL_CONE_INNER_ANGLE
     (integer)
   AL_CONE_OUTER_ANGLE
     (integer)
   AL_REFERENCE_DISTANCE
     (integer)
   AL_POSITION
     (integer)
   AL_VELOCITY
     (integer)
   AL_DIRECTION
     (integer)
   AL_ORIENTATION
     (integer)
   AL_FORMAT_MONO8
     (integer)
   AL_FORMAT_MONO16
     (integer)
   AL_FORMAT_STEREO8
     (integer)
   AL_FORMAT_STEREO16
     (integer)
   AL_INITIAL
     (integer)
   AL_PLAYING
     (integer)
   AL_PAUSED
     (integer)
   AL_STOPPED
     (integer)
   AL_LOOPING
     (integer)
   AL_TRUE
     (integer)
   AL_FALSE
     (integer)