EIO_SYNC(3) 1 EIO_SYNC(3) eio_sync - Commit buffer cache to diskSYNOPSISresource eio_sync ([int $pri = EIO_PRI_DEFAULT], [callable $callback = NULL], [mixed $data = NULL])DESCRIPTIONPARAMETERSThis function has no parameters.RETURN VALUESeio_sync(3) returns request resource on success or FALSE on error. PHP Documentation Group EIO_SYNC(3)