Mysql User-Defined Function SQL query error ?????????

[liang chen]

$mysqli->multi_query("

delimiter $$
drop function if exists newcount$$

CREATE FUNCTION newcount(u char)
RETURNS VARCHAR(60)
BEGIN
DECLARE c varchar(1000);
DECLARE tc varchar(1000);
DECLARE n int;
set c='';
set tc=(select ~~~~~~~~~~~~);
set n=0;
WHILE tc!='' DO
if(c='') then set c=tc;
else set c=CONCAT(c, ',', tc);
end if;
set tc=(select ~~~~~~~~~~~);
set n=n+1;
END WHILE;
return c;
END$$
delimiter ;
select newcount(1) as c;

");


error !

run the sql on mysql command line client was correct ????