php 如何知道是否在视图中设置了变量
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How to know if a variable is set in the view
提问by Israel Ortu?o
I'd like to know if there's a way to know if a variable exists in a view.
我想知道是否有办法知道视图中是否存在变量。
I'm creating a custom form's builder for my app theme and I'd like to include the $errorsvariable in a HTML tag. Any way to know if it's previously set in the view?
我正在为我的应用程序主题创建自定义表单的构建器，并且我想将该$errors变量包含在 HTML 标记中。有什么方法可以知道它以前是否在视图中设置过？
UpdateI meant how to access a view var outside the view. How to access the $errors var from somewhere else, a package for instance.
更新我的意思是如何访问视图外的视图变量。如何从其他地方访问 $errors var，例如一个包。
I'm currently creating a custom form builder:
我目前正在创建一个自定义表单构建器：
{{ MyFormBuilder::text('name', 'value', array()) }}
It should print
它应该打印
<input name="name" value="value" ... />
<p>ERRORS NAME REQUIRED</p>
The errors <p>tag only if an error found validating this field. I want to check from my text()function if there's an error in $errors.
<p>仅当发现验证此字段的错误时才使用错误标记。我想从我的text()函数中检查$errors.
I've tried using global $errorsin my function, but it does not work...
我试过global $errors在我的函数中使用，但它不起作用......
I hope it's a bit more clear ;)
我希望它更清楚一点;)
SolvedUsing Session::get('errors');;D
Thanks to @machuga.
使用Session::get('errors');;D解决，感谢@machuga。
回答by Deepak Mallah
this should work
这应该有效
if(isset($var))
回答by Tim F
Are you talking to the $errorsvariable that is returned by the validatorclass? If so, don't bother with the extra code to check if it exists. From the L4 docs:
你是在和类$errors返回的变量说话validator吗？如果是这样，不要用额外的代码来检查它是否存在。来自 L4 文档：
Laravel will always check for errors in the session data, and automatically bind them to the view if they are available. So, it is important to note that an $errors variable will always be available in all of your views, on every request, allowing you to conveniently assume the $errors variable is always defined and can be safely used.
Laravel 将始终检查会话数据中的错误，并在它们可用时自动将它们绑定到视图。因此，重要的是要注意 $errors 变量将始终在您的所有视图中可用，在每个请求中，允许您方便地假设 $errors 变量始终已定义并且可以安全使用。
Simply checking if( isset($errors))will always return truein Laravel 4.
简单的检查if( isset($errors))总是会true在 Laravel 4 中返回。
回答by jairobg
You are using blade Code:
您正在使用刀片代码：
@if($var)
--php code--
@endif回答by jairobg
回答by Moeed Farooqui
if(isset($errors) && !empty($errors)){
// your code here
}
