* Make a new temporary file on the file system.
* Temporary files may be purged when the file object falls out of scope.
*
* Make a new temporary file on the file system.
* Temporary files may be purged when the file object falls out of scope.
*
* @return TempFSFile|null
*/
public static function factory( $prefix, $extension = '' ) {
* @return TempFSFile|null
*/
public static function factory( $prefix, $extension = '' ) {