*
* Write operations should *never* be done on this file as some backends
* may do internal tracking or may be instances of FileBackendMultiWrite.
*
* Write operations should *never* be done on this file as some backends
* may do internal tracking or may be instances of FileBackendMultiWrite.
* Additionally, further calls to this function may return the same file.
*
* @param array $params Parameters include:
* Additionally, further calls to this function may return the same file.
*
* @param array $params Parameters include: