PHP 将来自 3 table 关系的数据循环到每个 div 元素中

Question

我需要帮助。我想在我的 Codeigniter PHP 页面中显示来自 3 table 关系的 div 元素：

my Table is=

    Category =>category_id, category_name 
    Sub_Category => sub_category_id,category_id, sub_category_name  
    Item => item_id, sub_category_id,item_name

型号=

public function item_data()
   {
   $query = $this->db->query('SELECT A.item_name, B.sub_category_name, C.category_name FROM 
   item A
   sub_kategori A 
   LEFT JOIN sub_category B ON B.sub_category_id = A.sub_category_id
   LEFT JOIN category C ON C.category_id = B.category_id
   ');
   return $query->result();
   }

控制器：

function item_view()
{
//--------
$item_data = $this->model_app->data_ticket();
$data['item_data'] = $item_data;

$this->load->view('template', $data);
}

查看：

<?php $no = 0; foreach($item_data as $row) : $no++;?>
 <div class="card">           
   <div class="card-header">
     <h3 class=""><?php echo $row->sub_category_name;?></h3>
     <h5 class=""><?php echo $row->category_name;?></h5>
   </div>
   <div class="card-footer">
     <ul>

//... How to show/Looping item_name by sub_category_id ...?

       <li class="nav-item">
         <a href="#" class="nav-link">
           <?php echo $row->item_name;?>
         </a>
       </li>                                          
     </ul>
   </div>
 </div>
<?php endforeach;?>

以上代码显示 item_name 重复了 sub_category_name。现在输出=

sub_category1 => category1=>item1
sub_category1 => category1=>item2
sub_category1 => category1=>item3

sub_category2 => category1=>item4
sub_category2 => category1=>item5
sub_category2 => category1=>item6
...

我要获取实现数据回显=

sub_category1 => category1=>item1,item2,item3
sub_category2 => category1=>item4,item5,item6
.....

问题：如何 show/Looping item_name 每个 sub_category_id ...?

感谢您的帮助。

Answer 1

我假设您的查询结果如下：

Iphone Xr 64 GB|Iphone|Apple

Iphone XS 128 GB|Iphone|Apple

Airpod 2| Headphone|Apple

Airpod Pro| Headphone|Apple

Macbook air 2020 128Gb| laptop|Apple

所以，如果你想按子类别显示分组，你应该在模型或控制器中重组你的数据，而不是在视图中这样做，因为嵌套 php 代码和 html代码很难调试和重用。结构如下：

[Note]：因为你查询的输出是stdclass，所以在使用我的代码之前将其转换为数组：

$arr = json_decode(json_encode($yourObject), TRUE);

['Iphone'=>
    [
        'category'=>'Apple',
        'items'=> ['Iphone Xr 64 GB','Iphone XS 128 GB']
    ]
]

我有一些代码供您按 sub_category

对列表进行分组

$arr = [
    ['category'=>'Apple','sub_category'=>'Iphone','item'=>'Iphone XR'],
    ['category'=>'Apple','sub_category'=>'Iphone','item'=>'Iphone XS'],
    ['category'=>'Apple','sub_category'=>'Iphone','item'=>'Iphone X'],
    ['category'=>'Apple','sub_category'=>'HeadPhone','item'=>'AirPod 2'],
    ['category'=>'Apple','sub_category'=>'Laptop','item'=>'Macbook air'],
    ['category'=>'Samsung','sub_category'=>'MobilePhone','item'=>'Galaxy S10'],
];
$newArr = [];
foreach ($arr as $key => $item) {
    $newArr[$item['sub_category']][$key] = $item;
}

结果将是：

$newArr = [
    'Iphone'=>[
        ['category'=>'Apple','sub_category'=>'Iphone','item'=>'Iphone XR'],
        ['category'=>'Apple','sub_category'=>'Iphone','item'=>'Iphone XS'],
        ['category'=>'Apple','sub_category'=>'Iphone','item'=>'Iphone X'],
    ],
    ...
];

视图应该是：

<?php foreach($new_arr as $key => $value)?>
 <div class="card">           
   <div class="card-header">
     <h3 class=""><?php echo $key;?></h3>
     <h5 class=""><?php echo $value[0]['category'];?></h5>
   </div>
   <div class="card-footer">
     <ul>
       <?php foreach($value as $item) ?>
          <li class="nav-item">
             <a href="#" class="nav-link">
           <?php echo $item['item']?>
         </a>
       </li> 
       <?php endforeach;?>                                         
     </ul>
   </div>
 </div>
<?php endforeach;?>

PHP 将来自 3 table 关系的数据循环到每个 div 元素中

PHP Looping data from 3 table relation into each div element

php

loops

codeigniter