Extend Laravel Collections with `macro()`

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The Laravel Collection class is incredibly powerful and can be extended even further using the macro() method. This method allows you to define custom methods for collections, tailoring them to your specific needs. In this blog post, we'll explore how to use macro() to create a custom method and demonstrate its practical application.

What is macro()?

The macro() method enables you to add custom methods to the Collection class. This is particularly useful when you have repetitive tasks or specific data manipulations that you want to encapsulate in a reusable method.

Example: Converting Strings to Uppercase

Suppose you frequently need to convert all strings in a collection to uppercase. Instead of repeating the logic every time, you can define a custom method using macro().

Step-by-Step Implementation

  1. Create a Service Provider

If you don't have a custom service provider yet, you can create one using the Artisan command:

php artisan make:provider CollectionMacroServiceProvider
  1. Register the Macro

Open the service provider you just created (or an existing one) and register the macro in the boot method. Here’s how you can define the toUpper macro:

// app/Providers/CollectionMacroServiceProvider.php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Collection;

class CollectionMacroServiceProvider extends ServiceProvider
     * Register any application services.
     * @return void
    public function register()

     * Bootstrap any application services.
     * @return void
    public function boot()
        Collection::macro('toUpper', function () {
            return $this->map(function ($item) {
                return strtoupper($item);
  1. Register the Service Provider

Ensure the service provider is registered in the config/app.php file:

// config/app.php

'providers' => [
    // Other service providers...

  1. Using the Macro

After defining and registering your macro, you can use it anywhere in your application:

$collection = collect(['a', 'b', 'c'])->toUpper();

// Result: ['A', 'B', 'C']

Benefits of Using macro()

  1. Code Reusability: Encapsulate repetitive logic in a single method that can be reused throughout your application.
  2. Cleaner Code: Simplify your codebase by reducing the need for repetitive code blocks.
  3. Enhanced Readability: Custom methods can make your code more expressive and easier to understand.


The macro() method is a powerful feature that allows you to extend the functionality of Laravel collections. By creating custom methods, you can make your code more reusable, readable, and maintainable. Whether it's for converting strings, filtering data, or performing calculations, macro() can help you streamline your development process.

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