thinkphp6 find_in_set使用实例

FIND_IN_SET(str,strlist)

str 要查询的字符串
strlist 字段名 参数以”,”分隔 如 (1,2,6,8)
查询字段(strlist)中包含(str)的结果，返回结果为null或记录

$main_category =[3,4];

if(!empty($main_category)) {
            $sql_category='';
            foreach($main_category as $v){
                $sql_category .= "FIND_IN_SET('{$v}',main_category) and ";
            }
            $sql_category = rtrim($sql_category," and ");
            $map[] = ['', 'exp', Db::raw($sql_category)];
        }

var_dump($map);

搜索3,4的主营类目。如果用in方法就会搜索遗漏数据