Laravel分裂成5

Question

问题是我分成了五个部分。如何用foreachs打印5 $collection。我该如何对待分裂的$collection。

ExamsController@create

$groups = $questions->split(5);
$groups->toArray();
dd($groups);

dd($groups)

Collection {#455 ▼
  #items: array:5 [▼
    0 => Collection {#394 ▶}
    1 => Collection {#619 ▶}
    2 => Collection {#407 ▶}
    3 => Collection {#398 ▶}
    4 => Collection {#275 ▶}
  ]
}

Create.blade.php

@foreach($questions as $question)
 ......
@endforeach

更新

@foreach ($collections as $i => $collection)
@foreach ($collection as $a => $question)
    var_dump($question);
@endforeach</br>
@foreach ($collection as $b => $question)
    var_dump($question);
@endforeach</br>
@foreach ($collection as $c => $question)
    var_dump($question);
@endforeach</br>
@foreach ($collection as $d => $question)
    var_dump($question);
@endforeach</br>
@foreach ($collection as $e => $question)
    var_dump($question);
@endforeach
@endforeach

Answer 1

您正在将返回的行从模型中拆分为5个集合。每个集合都包含x数量的问题。您需要迭代您的集合以及集合中的问题。

另一个foreach循环应该能做到这一点。

$collections = $questions->split(5);

我们可以想象，$collections看起来会是这样的：

$collections = [   
    ['Q1?', 'Q2?'], // collection 1
    ['Q3?', 'Q4?'], // collection 2
    ['Q5?', 'Q6?'], // collection 3
    ['Q7?', 'Q8?'], // collection 4
    ['Q9?']         // collection 5
];

正如前面提到的那样，迭代这种结构需要2个foreach循环。

• 首先迭代集合
• 第二，迭代当前集合中的每个问题。

看起来是这样的：

foreach ($collections as $i => $collection) {
    foreach ($collection as $j => $question) {
        echo "Collection $i, Question $j : $question \n";
    }
}

更新：

预期产出如下：

(注意$i和$j是如何通过每次迭代与$collection和$question相关联的)

以下是PHP沙箱代码：

http://sandbox.onlinephpfunctions.com/code/77fb25e94a7ab81e699b99d5e354a1c5fe3a0d11

Collection 0, Question 0 : Q1? 

Collection 0, Question 1 : Q2? 

Collection 1, Question 0 : Q3? 

Collection 1, Question 1 : Q4? 

Collection 2, Question 0 : Q5? 

Collection 2, Question 1 : Q6? 

Collection 3, Question 0 : Q7? 

Collection 3, Question 1 : Q8? 

Collection 4, Question 0 : Q9? 

这里是Laravel关于这方面的官方文档：https://laravel.com/docs/5.6/collections#method-split