php 在 Laravel Blade 中查找 foreach 循环的最后一次迭代
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Find last iteration of foreach loop in laravel blade
提问by user947668
In blade template i use last() method to find last iteration of foreach loop:
在刀片模板中，我使用 last() 方法来查找 foreach 循环的最后一次迭代：
@foreach ($colors as $k => $v)
<option value={!! $v->id !!} {{ $colors->last()->id==$v->id ? 'selected':'' }} > {!! $v->name !!} </option>
@endforeach
Is it ok? Perhaps there is a Laravel-style way to do the same?
可以吗？也许有一种 Laravel 风格的方式来做同样的事情？
回答by Tom Kur
回答by Sebastian Sulinski
What you do is absolutely fine if you want to obtain instance of the last item in the collection.
如果您想获取集合中最后一项的实例，您所做的绝对没问题。
Additionally, in Laravel 5.3 you can use $loopvariable, which allows you to get boolean for last iteration $loop->lastor to obtain current iteration index $loop->iteration, total number of records $loop->countand a few more The Loop Variable
此外，在 Laravel 5.3 中，您可以使用$loop变量，它允许您获取上次迭代的布尔值$loop->last或获取当前迭代索引$loop->iteration、记录总数$loop->count和更多循环变量
@foreach ($posts as $post)
{{ $post->title }} ({{ $loop->iteration }} of {{ $loop->count }})
@endforeach
回答by cresjie
if $colorsis a Collection, $colors->last()and end($colors)both works
if$colors是 a Collection，$colors->last()并且end($colors)两者都有效
回答by mohammad gitipasand
@foreach ($colors as $v)
<option value={!! $v->id !!} {!!($v == end($colors)) ? 'selected="selected"' : '' !!} > {!! $v->name !!} </option>
@endforeach
or
或者
@foreach ($colors as $v)
<option value={!! $v->id !!} {{($v == end($colors)) ? 'selected="selected"' : '' }} > {!! $v->name !!} </option>
@endforeach
回答by bim
Don't know if that last method is working but if not, try this:
不知道最后一种方法是否有效，但如果无效，请尝试以下方法：
@foreach ($colors as $v)
<option value={!! $v->id !!} @if($v == end($colors)) 'selected' @endif > {!! $v->name !!} </option>
@endforeach
