(PECL openal >= 0.1.0)
openal_buffer_destroy — Destroys an OpenAL buffer
openal_buffer_destroy ( resource $buffer ) : bool
buffer
An Open AL(Buffer) resource (previously created by openal_buffer_create()).
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/function.openal-buffer-destroy.php