"insert into things(i_id,i_name,i_price)values(\'$i_id\',\'$i_name\',\'$i_price\')"
改为
"insert into things(i_id,i_name,i_price)values(".intval($i_id).",'".mysql_real_escape_string ($i_name,$sqllink)."',".intval($i_price).")"