How to Declare Global Variables Available to All Blade Files in Laravel

Learn how to efficiently declare global variables in Laravel for use across all Blade files, ensuring seamless data access in your application.
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This video is based on the question https://stackoverflow.com/q/68634469/ asked by the user 'rockstardev' ( https://stackoverflow.com/u/146366/ ) and on the answer https://stackoverflow.com/a/68634655/ provided by the user 'Eric Qvarnström' ( https://stackoverflow.com/u/9807661/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

When developing applications in Laravel, there may be situations where you need to access the same data across multiple views or Blade templates. A common example is working with a list of products stored in a database. Instead of fetching this data in every controller method and passing it to each view, you can declare these products as global variables to simplify and streamline your code. In this guide, we'll cover how to declare global variables that are available to all Blade files in your Laravel application.

The Need for Global Variables

Fetching data repeatedly for each view can quickly become cumbersome and prone to errors. For instance, consider the following block of code that retrieves products from the database:

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Doing this for every controller can lead to repetitive code. To overcome this, we need a method to declare global variables that automatically become available in all templates.

Solution Overview

The best way to achieve this in Laravel is through middleware. Middleware provides a convenient mechanism to filter HTTP requests entering your application and thus can be used for tasks such as sharing data across all views.

Steps to Declare Global Variables Using Middleware

Here's a step-by-step guide to implementing global variables using middleware.

Step 1: Create the Middleware

First, create a middleware class that will handle sharing the global variable. You can do this by creating a new file named GlobalVariablesMiddleware.php within the app/Http/Middleware directory.

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Step 2: Register Middleware in Kernel

Now, you need to register your newly created middleware in the Kernel.php located in the app/Http directory. Add your middleware to the $routeMiddleware array.

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Step 3: Apply Middleware to Routes

Next, you'll want to decide where to apply this middleware. You can apply it to individual routes or group routes together. For example:

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By applying the middleware to a group of routes, the $products variable will be available in all views rendered for those routes.

Conclusion

By following these steps, you can create a middleware to effectively declare your global variables in Laravel. This approach not only minimizes repetitive code but also enhances the maintainability of your application. If you decide in the future that you no longer require global access to certain data, you can easily modify or remove the middleware without complex changes throughout your codebase.

With global variables, you can simplify your setup and make your Blade templates cleaner, allowing you to focus more on building features that matter!

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