Php 带有无序$key的foreach（$key=>；$categoryTournament）

我使用的是Laravel，但我认为这对PHP来说是通用的

当我尝试使用此代码循环集合时

@foreach($categoryTournaments as $key => $categoryTournament)
   {{ $key }} // Means echo
@endforeach

输出：

120243

我随机获得无序的键，而不是像我预期的那样拥有

01234

CategoryTournament是一个对象，我加入了5个对象：

Collection {#522 ▼
  #items: array:5 [▼
    0 => CategoryTournament {#523 ▼
      #dates: array:3 [▶]
      #table: "category_tournament"
      +timestamps: true
      #fillable: array:2 [▶]
      #connection: null
      #primaryKey: "id"
      #perPage: 15
      +incrementing: true
      #attributes: array:6 [▼
        "id" => 164
        "tournament_id" => 71
        "category_id" => 5
        "created_at" => "2016-03-23 00:04:47"
        "updated_at" => "2016-03-23 00:04:47"
        "deleted_at" => null
      ]
      #original: array:6 [▶]
      #relations: []
      #hidden: []
      #visible: []
      #appends: []
      #guarded: array:1 [▶]
      #dateFormat: null
      #casts: []
      #touches: []
      #observables: []
      #with: []
      #morphClass: null
      +exists: true
      +wasRecentlyCreated: false
      #forceDeleting: false
    }
    1 => CategoryTournament {#524 ▼
      #dates: array:3 [▶]
      #table: "category_tournament"
      +timestamps: true
      #fillable: array:2 [▶]
      #connection: null
      #primaryKey: "id"
      #perPage: 15
      +incrementing: true
      #attributes: array:6 [▶]
      #original: array:6 [▶]
      #relations: []
      #hidden: []
      #visible: []
      #appends: []
      #guarded: array:1 [▶]
      #dateFormat: null
      #casts: []
      #touches: []
      #observables: []
      #with: []
      #morphClass: null
      +exists: true
      +wasRecentlyCreated: false
      #forceDeleting: false
    }
    2 => CategoryTournament {#525 ▼
      #dates: array:3 [▶]
      #table: "category_tournament"
      +timestamps: true
      #fillable: array:2 [▶]
      #connection: null
      #primaryKey: "id"
      #perPage: 15
      +incrementing: true
      #attributes: array:6 [▶]
      #original: array:6 [▶]
      #relations: []
      #hidden: []
      #visible: []
      #appends: []
      #guarded: array:1 [▶]
      #dateFormat: null
      #casts: []
      #touches: []
      #observables: []
      #with: []
      #morphClass: null
      +exists: true
      +wasRecentlyCreated: false
      #forceDeleting: false
    }
    3 => CategoryTournament {#526 ▼
      #dates: array:3 [▶]
      #table: "category_tournament"
      +timestamps: true
      #fillable: array:2 [▶]
      #connection: null
      #primaryKey: "id"
      #perPage: 15
      +incrementing: true
      #attributes: array:6 [▶]
      #original: array:6 [▶]
      #relations: []
      #hidden: []
      #visible: []
      #appends: []
      #guarded: array:1 [▶]
      #dateFormat: null
      #casts: []
      #touches: []
      #observables: []
      #with: []
      #morphClass: null
      +exists: true
      +wasRecentlyCreated: false
      #forceDeleting: false
    }
    4 => CategoryTournament {#527 ▼
      #dates: array:3 [▶]
      #table: "category_tournament"
      +timestamps: true
      #fillable: array:2 [▶]
      #connection: null
      #primaryKey: "id"
      #perPage: 15
      +incrementing: true
      #attributes: array:6 [▶]
      #original: array:6 [▶]
      #relations: []
      #hidden: []
      #visible: []
      #appends: []
      #guarded: array:1 [▶]
      #dateFormat: null
      #casts: []
      #touches: []
      #observables: []
      #with: []
      #morphClass: null
      +exists: true
      +wasRecentlyCreated: false
      #forceDeleting: false
    }
  ]
}

---

知道为什么会这样吗？

您可以使用

ksort

函数根据键对数组进行排序

ksort($categoryTournaments); 

---

此函数按升序排列数组键

列表无序实际上是完全正常的。在PHP中是允许的

如果您想要有一个有序列表，您应该使用以下函数之一：

ksort（$categoryTournaments）

（如果可能的话）

如果不是：

$categoryTournaments->sortBy（'id'）

，其中id是要排序的键。

---

检查您提供的文档中的其他函数。

您能说出Collection类的确切含义吗？可能它的迭代器接口实现包含一些自定义逻辑。@JuliatzindelToro将此函数添加到foreach循环之上