php - Deprecated error in pass by reference in latest version of localhost -


all project error free on localhost vertrigo_222 (and on livehost).
now trying upgrade localhost latest version vertrigo_230.
i facing following deprecated error: enter image description here

here line number 1170 , 1171:

calculate_city_row_col($row['attacker_city_id'], &$att_city_row, &$att_city_col); calculate_city_row_col($row['defender_city_id'], &$def_city_row, &$def_city_col);

please give me solution.
thank in advance.

i think can try remove & before $att_city_row , $att_city_col, $def_city_row, $def_city_col


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