(PECL openal >= 0.1.0)
openal_source_set — Set source property
openal_source_set ( resource $source , int $property , mixed $setting ) : bool
source
An Open AL(Source) resource (previously created by openal_source_create()).
property
 Property to set, one of: AL_BUFFER (OpenAL(Source)), AL_LOOPING (bool), AL_SOURCE_RELATIVE (int), AL_SOURCE_STATE (int), AL_PITCH (float), AL_GAIN (float), AL_MIN_GAIN (float), AL_MAX_GAIN (float), AL_MAX_DISTANCE (float), AL_ROLLOFF_FACTOR (float), AL_CONE_OUTER_GAIN (float), AL_CONE_INNER_ANGLE (float), AL_CONE_OUTER_ANGLE (float), AL_REFERENCE_DISTANCE (float), AL_POSITION (array(float,float,float)), AL_VELOCITY (array(float,float,float)), AL_DIRECTION (array(float,float,float)). 
setting
 Value to assign to specified property. Refer to the description of property for a description of the value(s) expected. 
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/function.openal-source-set.php