Laravel - 如何在刀片视图中计算数组中对象的总和
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Laravel - how to calculate the sum of objects in an array in blade view
提问by Leff
I have a foreach loop in a blade view, where I am listing the objects that have a pivot property price:
我在刀片视图中有一个 foreach 循环，我在其中列出了具有枢轴属性价格的对象：
@foreach($transaction->options as $option)
<div class="row">
<div class="col-md-6">
<p>Option description: {{ $option->description }}</p>
<p>Price: {{ $option->pivot->price }}</p>
</div>
</div>
<hr>
@endforeach
<div class="row">
<div class="col-md-6">
<h4>Options total: </h4>
</div>
</div>
I would like to since I am doing a foreach loop here, calculate the sum of all the options so that I could write it next to Options total:
我想，因为我在这里做一个 foreach 循环，计算所有选项的总和，这样我就可以把它写在 Options total:
I have tried with this:
我试过这个：
@foreach($transaction->options as $option)
<div class="row">
<div class="col-md-6">
<p>Option description: {{ $option->description }}</p>
<p>Price: {{ $option->pivot->price }}</p>
@php($total += $option->pivot->price)
</div>
</div>
<hr>
@endforeach
<div class="row">
<div class="col-md-6">
<h4>Options total: {{ $total }}</h4>
</div>
</div>
But, that didn't work, I got an error:
但是，这不起作用，我收到了一个错误：
Undefined variable: total
未定义变量：总计
How can I do this?
我怎样才能做到这一点？
回答by Alexey Mezenin
Define the variable first:
首先定义变量：
@php($total = 0);
You can also get sum of pivot column with:
您还可以通过以下方式获得数据透视列的总和：
$transaction->options()->sum('price')
回答by CHARITRA SHRESTHA
You can simply do the calculations in the blade template. This can be helpful for other users. Just do the calculation inside blade syntax {{ }} and use the display:none; css property. For example
您可以简单地在刀片模板中进行计算。这对其他用户很有帮助。只需在刀片语法 {{ }} 中进行计算并使用 display:none; css 属性。例如
<div style="display: none">
{{ $total = 0 }}
</div>
@foreach($report as $device)
<tr>
<td>{{$device->id}}</td>
<td>{{$device->price}}</td>
<div style="display: none">{{$total += $device->price}}</div>
</tr>
@endforeach
<tr>
<th>Total Distance Travelled</th>
<th>{{$total}}</th>
</tr>回答by hlscalon
Blade has a @phpdirective to execute a block of plain PHP within your template. Be aware that this may be a sign of bad design, and you should avoid put much logic inside your template. Ie:
Blade 有一个@php指令来在你的模板中执行一段普通的 PHP。请注意，这可能是糟糕设计的标志，您应该避免在模板中放置太多逻辑。IE：
@php
$total = 0;
@endphp
@foreach ($items as $item)
<tr>
<td>{{ $item->name }}</td>
<td>{{ $item->code }}</td>
<td>{{ $item->price }}</td>
</tr>
@php
$total += $item->price;
@endphp
@endforeach
....
<p>Total {{ $total }}</p>
