Laravel：View::share() 和 View::composer() 的区别
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Laravel: Difference between View::share() and View::composer()
提问by enchance
In relation to the question Passing default variables to view, to pass variables available among all views, is there a technical or functional difference between the use of View::composer():
关于将默认变量传递给视图、在所有视图之间传递可用变量的问题，使用以下方法之间是否存在技术或功能差异View::composer()：
View::composer('*', function($view) {
$thundercats = 'Woooooohh!!';
$view->with('thundercats', $thundercats);
})
in the filters.phpfile or the use of View::share()in the BaseController.phpfile:
在filters.php文件或使用View::share()在BaseController.php文件：
public function __construct {
$thundercats = 'Woooooohh!!';
View::share('thundercats', $thundercats);
}
I've only recently learned about View::share()and find it exceptionally intruiging although I've already started using the former in another project.
View::share()尽管我已经开始在另一个项目中使用前者，但我最近才了解并发现它非常有趣。
Edit:
编辑：
My first assumption is that the former is a file (filters.php) while the the latter is a class (BaseController.php). With this in mind, I'm guessing a class is much better? Although, I'm not quite sure why at this point. :)
我的第一个假设是前者是一个文件（filters.php），而后者是一个类（BaseController.php）。考虑到这一点，我猜一个班级会好得多？虽然，我不太确定为什么在这一点上。:)
回答by tplaner
Technically they are not at all alike. View::sharesimply sets a variable, while View::composeris a callback function.
从技术上讲，它们完全不同。View::share简单地设置一个变量，View::composer而是一个回调函数。
Let me explain in greater detail:
让我更详细地解释一下：
View::shareis really straight forward it sets a variable which can be used within any of the views, think of it like a global variable.
View::share非常简单，它设置了一个可以在任何视图中使用的变量，把它想象成一个全局变量。
View::composerregisters an event which is called when the view is rendered, don't confuse it with a View::creatorwhich is fired when a view is instantiated.
View::composer注册一个在呈现视图时调用的事件，不要将它与View::creator实例化视图时触发的 a混淆。
View::composer/ View::creatorcan both be used as a class which is well documented.
View::composer/View::creator都可以用作一个有据可查的类。
While these give you the ability to pass additional data to a view, they also give you to ability to do a lot of other things, for example they could:
虽然这些使您能够将附加数据传递给视图，但它们也使您能够执行许多其他操作，例如它们可以：
- Aid in debugging a view
- Log information about views
- Be used to create custom caching (probably not a great idea, but possible)
- 帮助调试视图
- 记录视图信息
- 用于创建自定义缓存（可能不是一个好主意，但可能）
These are just some examples of what couldbe possible using View::composerand View::creator.
这些只是什么一些例子可以是可能的使用View::composer和View::creator。
回答by Atrakeur
View::composer('*', callback());
Means that the callback will be called for all views (*).
意味着将为所有视图 (*) 调用回调。
View::share
Means that a variable will be shared with all outputed views.
意味着一个变量将与所有输出的视图共享。
Because the first is in filters.php, it'll apply for all routes.
因为第一个在filters.php 中，它将适用于所有路由。
The second is in a controller contructor, so it'll apply for all views triggered by this controller.
第二个在控制器构造函数中，因此它将应用于由该控制器触发的所有视图。
One last thing: when overriding a constructor, it's a good pratice to allways call the parent constructor with this code:
最后一件事：在覆盖构造函数时，始终使用以下代码调用父构造函数是一种很好的做法：
parent::_construct();
