get index of the first existing array element tag - tag of array (AR_LONG or AR_STR) id - array id returns: -1 - array is empty otherwise returns index of the first array elementlong get_first_index(long tag, long id);
get index of the first existing array element tag - tag of array (AR_LONG or AR_STR) id - array id returns: -1 - array is empty otherwise returns index of the first array elementlong get_first_index(long tag, long id);