문제가 생겨서 그러는데 아시는고수님,,,,

select * from g4_write_B13 where wr_is_comment = 0 order by wr_n..........를


select * from 'g4_write_B13' where wr_is_comment = 0 order by .......또는


$board = "g4_write_B13";

select * from $board where wr_is_comment = 0 order by wr_num limit 0, 4 등으로 테스트 해보세요.