udm_get_res_param() returns result parameter value on success, FALSE on error.
res - a link to result identifier, received after call to udm_find().
param - parameter identifier, may have the following values:
UDM_PARAM_NUM_ROWS - number of received found links on the current page. It is equal to UDM_PARAM_PAGE_SIZE for all search pages, on the last page - the rest of links.
UDM_PARAM_FOUND - total number of results matching the query.
UDM_PARAM_WORDINFO - information on the words found. E.g. search for "a good book" will return "a: stopword, good:5637, book: 120"
UDM_PARAM_SEARCHTIME - search time in seconds.
UDM_PARAM_FIRST_DOC - the number of the first document displayed on current page.
UDM_PARAM_LAST_DOC - the number of the last document displayed on current page.