php Laravel 4.2 刀片：检查是否为空
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Laravel 4.2 blade: check if empty
提问by Marten
In Laravel blade you can do:
在 Laravel 刀片中，您可以执行以下操作：
{{ $variable or 'default' }}
This will check if a variable is set or not. I get some data from the database, and those variables are always set, so I can not use this method.
这将检查是否设置了变量。我从数据库中获取了一些数据，并且这些变量总是被设置的，所以我不能使用这种方法。
I am searching for a shorthand 'blade' function for doing this:
我正在寻找用于执行此操作的速记“刀片”功能：
{{ ($variable != '' ? $variable : '') }}
It is hard to use this piece or code for doing this beacuse of, I do not know how to do it with a link or something like this:
很难使用这篇文章或代码来做这件事，因为我不知道如何用链接或类似的东西来做：
<a href="{{ $school->website }}" target="_blank">{{ $school->website }}</a>
I tried:
我试过：
{{ ($school->website != '' ? '<a href="{{ $school->website }}" target="_blank">{{ $school->website }}</a>' : '') }}
But, it does not work. And, I would like to keep my code as short as possible ;)
但是，它不起作用。而且，我想让我的代码尽可能短；)
Can someone explain it to me?
有人可以向我解释一下吗？
UPDATE
更新
I do not use a foreach because of, I get a single object (one school) from the database. I passed it from my controller to my view with:
我不使用 foreach，因为我从数据库中获得了一个对象（一所学校）。我将它从我的控制器传递到我的视图：
$school = School::find($id);
return View::make('school.show')->with('school', $school);
So, I do not want to make an @if($value != ''){}around each $variable (like $school->name).
所以，我不想@if($value != ''){}围绕每个 $variable （如 $school->name）。
采纳答案by soroush gholamzadeh
try this:
尝试这个：
@if ($value !== '')
{{ HTML::link($value,'some text') }}
@endif
回答by Jeff Puckett
I prefer the @unlessdirectivefor readability in this circumstance.
在这种情况下，我更喜欢可读性@unless指令。
@unless ( empty($school->website) )
<a href="{{ $school->website }}" target="_blank">{{ $school->website }}</a>
@endunless
回答by Rajitha Bandara
With php 7, you can use null coalescing operator. This is a shorthand for @m0z4rt's answer.
使用 php 7，您可以使用空合并运算符。这是@m0z4rt 答案的简写。
{{ $variable ?? 'default' }}
回答by lieroes
{{ ($school->website != '' ? '<a href="{{ $school->website }}" target="_blank">{{ $school->website }}</a>' : '') }}
change to
改成
{{ ($school->website != '') ? '<a href="' . $school->website . '" target="_blank">' . $school->website . '</a>' : '' }}
or the same code
或相同的代码
{{ ($school->website != '') ? "<a href='$school->website' target='_blank'>$school->website</a>" : '' }}
回答by m0z4rt
{{ isset($variable) ? $variable : 'default' }}
回答by R. Gurung
I wonder why nobody talked about $variable->isEmpty()it looks more better than other. Can be used like:
我想知道为什么没有人谈论$variable->isEmpty()它看起来比其他人更好。可以像这样使用：
@if($var->isEmpty())
Do this
@else
Do that
@endif
