在library/comment.php上的链接

function getSelectedOneFieldJoin2TblGroupOrder($select, $table, $where, $join_table1, $join_condition1, $join_table2, $join_condition2, $order_by=null)
{
    $this->CI->db->select($select);
    $this->CI->db->from($table);
    
    $where2 = substr($where,6);
    $this->CI->db->where($where2);
          
        $this->CI->db->join($join_table1, $join_condition1, 'left');
        $this->CI->db->join($join_table2, $join_condition2, 'left');
            
    $this->CI->db->order_by($order_by);

    $query = $this->CI->db->get();
    $result = $query->row_array();

    if ($result) {
        return $result[$select];
    }
    
    return null; 
}

字符串
在控制器/ Jmeter 板. php上

$res1=$this->common->getSelectedOneFieldJoin2TblGroupOrder(
" 'Product Order Placed' as activity_title, u.created_on as created_on, m.first_name AS created_by",
"tbl_product_order u",
"WHERE u.status != 2 and u.status != 0",
"tbl_package_master p", // $join_table1
"p.id = u.package_id",
"tbl_user_master m", // $join_table2
"m.user_id = u.user_id",
"u.created_on", "ASC"
 );

型
在view/dashboard.php上查看

foreach($form_data as $Res)
{
    echo $Res['activity_title'] . " :: ";
    echo $Res['created_on'];
}

型
显示空结果。
当我把return**$result[$select];改为return $result;**时，它会显示3个结果，但在数组索引中没有值...
如何正确显示结果？