下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

ALC_FREQUENCY (int)

Context Attribute

ALC_REFRESH (int)

Context Attribute

ALC_SYNC (int)

Context Attribute

AL_FREQUENCY (int)

Buffer Setting

AL_BITS (int)

Buffer Setting

AL_CHANNELS (int)

Buffer Setting

AL_SIZE (int)

Buffer Setting

AL_BUFFER (int)

Source/Listener Setting (Integer)

AL_SOURCE_RELATIVE (int)

Source/Listener Setting (Integer)

AL_SOURCE_STATE (int)

Source/Listener Setting (Integer)

AL_PITCH (int)

Source/Listener Setting (Float)

AL_GAIN (int)

Source/Listener Setting (Float)

AL_MIN_GAIN (int)

Source/Listener Setting (Float)

AL_MAX_GAIN (int)

Source/Listener Setting (Float)

AL_MAX_DISTANCE (int)

Source/Listener Setting (Float)

AL_ROLLOFF_FACTOR (int)

Source/Listener Setting (Float)

AL_CONE_OUTER_GAIN (int)

Source/Listener Setting (Float)

AL_CONE_INNER_ANGLE (int)

Source/Listener Setting (Float)

AL_CONE_OUTER_ANGLE (int)

Source/Listener Setting (Float)

AL_REFERENCE_DISTANCE (int)

Source/Listener Setting (Float)

AL_POSITION (int)

Source/Listener Setting (Float Vector)

AL_VELOCITY (int)

Source/Listener Setting (Float Vector)

AL_DIRECTION (int)

Source/Listener Setting (Float Vector)

AL_ORIENTATION (int)

Source/Listener Setting (Float Vector)

AL_FORMAT_MONO8 (int)

PCM Format

AL_FORMAT_MONO16 (int)

PCM Format

AL_FORMAT_STEREO8 (int)

PCM Format

AL_FORMAT_STEREO16 (int)

PCM Format

AL_INITIAL (int)

Source State

AL_PLAYING (int)

Source State

AL_PAUSED (int)

Source State

AL_STOPPED (int)

Source State

AL_LOOPING (int)

Source State

AL_TRUE (int)

Boolean value recognized by OpenAL

AL_FALSE (int)

Boolean value recognized by OpenAL