Laravel Foreach循环

Question

我需要显示迭代数组的先前值，这是代码

<tr>
    <th></th>
    <th>Customer ID</th>
    <th>Customer Name</th>
    <th>Delivery Address</th>
    <th>Contact No.</th>
    <th>Zip Code</th>
    <th>Payment Terms</th>
    <th>Credit Limit</th>
</tr>
<?php $previousValue = null; ?>
@foreach($customer_count as $key => $value)
    <tr>
        <td>{{$previousValue=$value->customer_name }}</td>
        <td>{{ $value->id }}</td>
        <td>{{ $value->customer_name }}</td>
        <td>{{ $value->delivery_address }}</td>
        <td>{{ $value->contact_number }}</td>
        <td>{{ $value->area_id }}</td>
        <td>{{ $value->payment_term_id }}</td>
        <td>{{ $value->credit_limit }}</td>
    </tr>
@endforeach

我需要在迭代中显示客户的名字吗？ 关于如何执行此操作的任何想法？

Answer 1

最后设置值，我首先设置空白

 @foreach($customer_count as $key => $value)
      <tr>
           <td>{{$previousValue or ""}}</td>
           .....
           .....
      </tr>
      <?php $previousValue = $value->customer_name ?>
  @endforeach

Answer 2

$ customer_count [$ key-1]

当然，您需要检查是否存在或使用null-coalesce运算符之类的东西，所以：

@php

$previous = $customer_count[$key - 1] ?? false;

@endphp

然后使用：

@if( $previous ) 
... some stuff ...
@endif

您需要注射的任何地方。

Answer 3

请尝试这个

<td>{{ (!$loop->first) ? $customer_count[$key - 1]->customer_name : '' }}</td>

您可以了解有关foreach循环here的更多信息。

Answer 4

首先将先前的值设置为空白，然后在$previousValue的底部设置值

<?php $previousValue = '';?>
@foreach($customer_count as $key => $value)
    <tr>
        <td>{{ $previousValue }}</td>
        <td>{{ $value->id }}</td>
        <td>{{ $value->customer_name }}</td>
        <td>{{ $value->delivery_address }}</td>
        <td>{{ $value->contact_number }}</td>
        <td>{{ $value->area_id }}</td>
        <td>{{ $value->payment_term_id }}</td>
        <td>{{ $value->credit_limit }}</td>
    </tr>
    <?php $previousValue = $value->customer_name; ?>
@endforeach