(PECL eio >= 0.0.1dev)
eio_close — Close file
eio_close() closes file specified by fd.
The file descriptor
The request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL. If NULL passed, pri internally is set to EIO_PRI_DEFAULT.
callback function is called when the request is done. It should match the following prototype:
void callback($data, $result);
Arbitrary variable passed to callback.
eio_close() returns request resource on success or FALSE on error.