Manual:Hooks/BeforeParserFetchFileAndTitle

Details

 * $parser: Parser object
 * $nt: the image title
 * &$time: the image timestamp (use '0' to force a broken thumbnail)
 * &$sha1: image base 36 sha1 (used to specify the file, $nt will be ignored if this is set)
 * &$descQuery: query string to add to thumbnail URL