如何在數組中綁定相同的鍵值？

Question

目前在陣列中遇到問題。 我無法得到我想要的輸出。

這是我的數組。

[
 {
  "id": 1,
  "name": "Antonio Trillanes",
  "category": "libel" 
 },
 {
  "id": 2,
  "name": "Liela De Lima",
  "category": "libel" 
 },
 {
  "id": 3,
  "name": "Gloria Macapagal Arroyo",
  "category": "plunder" 
 },
]

這是我想要的輸出。

我想要這樣。

[
 libel: [
          {
           "id": 1,
           "name": "Antonio Trillanes",
           "category": "libel" 
          },
          {
           "id": 2,
           "name": "Liela De Lima",
           "category": "libel" 
          }
        ],
 plunder: [
           {
            "id": 3,
            "name": "Gloria Macapagal Arroyo",
            "category": "plunder" 
           },
          ]
]

這是我的代碼。

$convicted_persons = [];
$persons = Persons::all();
foreach($persons as $person) {
     $convicted_persons [ $person['category'] ] = $person;
}

使用此代碼我沒有得到我想要的輸出。

我錯過了什么？

Answer 1

作為它的對象，你可以這樣做，

$temp = [];
foreach ($arr as $key => $value) {
    $temp[$value->category][] = $value; // if not object $temp[$value['category']][] = $value;
}
print_r($temp);die;

Answer 2

這是我在普通數組中所做的：

$array = array(
        array(
            "id" => 1,
            "name" => "Antonio Trillanes",
            "category" => "libel"
        ),
        array(
            "id" => 2,
            "name" => "Liela De Lima",
            "category" => "libel"
        ),
        array(
            "id" => 3,
            "name" => "Gloria Macapagal Arroyo",
            "category" => "plunder"
    ));
    $new_array = array();
    foreach ($array as $value){
        $new_array[$value['category']][] = $value;
    }

只需按如下方式更新您的行，只需在[ $person['category'] ]之后添加 [ [ $person['category'] ] ：

$convicted_persons [ $person['category'] ] = $person;
$convicted_persons [ $person['category'] ][] = $person;

Answer 3

您可以使用 Laravel 集合：

https://laravel.com/docs/5.8/collections#method-groupby

Persons::all()已經返回了一個充滿Person模型實例的集合，所以你可以這樣做：

$persons = Persons::all();
$convicted_persons = $persons->groupBy('category');