列表上方打印组名称

Question

按照以下内容

[
  {
   id: 1,
   group_name: 'usa',
   state : 'San Francisco'  
 },
  {
   id: 2,
   group_name: 'usa',
   state : 'Texas'  
 },
  {
   id: 3,
   group_name: 'usa',
   state : 'North Carolina'  
 },  {
   id: 4,
   group_name: 'aus',
   state : 'Darwin'  
 },
  {
   id: 5,
   group_name: 'aus',
   state : 'Melbourne'  
 },
  {
   id: 6,
   group_name: 'usa',
   state : 'Perth'  
 }
]

我想

Group Name: USA
State: San Francisco
State: Texas
State: North Carolina

Group Name: AUS
State: Darwin
State: Perth
State: Sydney

打印以下内容：我尝试在树枝中关注，但在循环中缺乏逻辑，

             {% for place in places %}
                        <tr>
                            <td>{{ dump(place.getGroupName()) }}</td>
                        </tr>                        
                        <tr>
                                <td>{{ place.state}}</td>
                       </tr>
            {% endif %}

我想把这个国家置于状态列表之上。在国家清单中，该国必须是各州以及其他国家的同一国家。

Answer 1

解决方案：
“ groupby”数组。

$groups = [
    [
        "id"=>1, 
        "group_name"=>"usa", 
        "state" => "San Franciso"
    ],
    [
        "id" => 2,
        "group_name" => "usa" ,
        "state"=> "Texas"
    ],
    [
        "id"=>3,
        "group_name"=>"usa",
        "state"=>"North Carolina"
    ],
    [
        "id" => 4,
        "group_name" => "aus",
        "state" => "Darwin"
    ],
    [
        "id" => 5,
        "group_name" => "aus",
        "state" => "Melbourne"
    ]
];

这是在数组中分组项目的简单方法之一，您应该分组“ group_name”字段。 （ https://wwwww.delftstack.com/ - 阵列）

$grouped = array();

foreach ($groups as $element) {
    $grouped[$element['group_name']][] = $element;
}

您应该得到这样的东西：

[
  "usa" => [
    ["id" => 1, "state" => "Texas", "group_name" => "usa"],
    ["id" => 2, "state" => "North Carolina", "group_name" => "usa"],
    ["id" => 3, "state" => "Texas", "group_name" => "usa"],
  ],
  "aus" => [
    ["id" => 4, "state" => "Melbourne", "group_name" => "aus"],
    ["id" => 5, "state" => "Darwin", "group_name" => "aus"]
  ]
]

建议：
在将数组发送到树枝之前，请尝试以这种方式构造该数组：

$groups = [
   'usa' => [
      [ "id" => 1, "state" => "Texas" ],
      [ "id" => 2, "state" => "North Carolina" ],
      [ "id" => 3, "state" => "Texas" ],
   ],
   'aus" => [ 
      [ "id" => 4, "state" => "Darwin" ],
      [ "id" => 5, "state" => "Melbourne" ],
    ]

]

在创建之后，您只需要迭代数组并显示值，而无需在Twig中分组数组。