Share 5 very useful Laravel Blade instructions

This article mainly introduces 5 very useful Laravel Blade instructions to you. The article introduces it in detail through sample code. It has certain reference learning value for everyone's study or work. Friends who need it can take a look. Let’s take a look

Introduction

Blade is a very simple and powerful template engine provided by Laravel, which is different from other popular PHP Template engine, Blade does not restrict you from using PHP native code in the view. All Blade views are compiled into native PHP code and cached until modified, meaning Blade has essentially zero overhead on application performance. Blade view files use the .blade.php file extension and are stored in the resources/views directory.

Next I will introduce you to five Laravel Blade commands, which will make you even more powerful when solving specific problems. If you are new to Laravel, these tips can help you realize the convenience and efficiency of the Laravel Blade template engine.

Without further ado, let’s get started.

1. Check whether the user is authenticated

You can check whether the user is authenticated by verifying whether it is empty:

@if(auth()->user())
 // 用户已认证
@endif

However, Laravel’s own Blade command can achieve the same function more concisely:

@auth
 // 用户已认证
@endauth

2. Detect whether the user is a guest

#Contrary to authentication, we can use the guest() method of the auth auxiliary function to detect whether the user is a guest Guest:

@if(auth()->guest())
 // 用户未认证
@endif

But Laravel also provides the @guest command for this:

@guest
 // 用户未认证
@endguest

We can also use the else statement to combine these two commands:

@guest
 // 用户未认证
@else
 // 用户已认证
@endguest

##3. If the first view exists, it will be introduced. Otherwise introduce the second

Building a multi-theme site may have the need to introduce one file if it exists, and another if it does not exist. You can simply use conditional judgment to Implementation:

@if(view()->exists('first-view-name'))
 @include('first-view-name')
@else
 @include('second-view-name')
@endif

But there is still a more concise and intuitive command to do this:

@includeFirst(['first-view-name', 'second-view-name']);

4. Introduce views based on conditions

When you only want to view a view based on certain logic (such as: an authenticated When users) add some content, it is very useful to introduce views based on conditions.

You can use @if conditions to write like this:

@if($post->hasComments())
 @include('posts.comments')
@endif

We can do it with just one line of command @includeWhen:

@includeWhen($post->hasComments(), 'posts.comments');

5. Introduce an existing view

If you have a custom theme The system or you need to dynamically create Blade views, then checking whether the file exists is a must.

You can call the exists method on the auxiliary function view():

@if(view()->exists('view-name'))
 @include('view-name')
@endif

You can also use the Blade command includeIf to handle it:

@includeIf('view-name')

You can learn more practical tips to optimize the front-end template in your Laravel project through the Blade official documentation.

Happy refactoring!

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