How to register twig filter into symfony?

@mallory_cormier 

To register a Twig filter in Symfony, follow these steps:

1. Create a new Twig extension class. This class will define the filter and its functionality. For example, create a file MyTwigExtension.php in the src/Twig directory:

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// src/Twig/MyTwigExtension.php

namespace AppTwig;

use TwigExtensionAbstractExtension;
use TwigTwigFilter;

class MyTwigExtension extends AbstractExtension
{
    public function getFilters()
    {
        return [
            new TwigFilter('my_filter', [$this, 'myFilterFunction'])
        ];
    }

    public function myFilterFunction($input)
    {
        // Filter logic
        // Return the filtered value
    }
}

1. Register the extension as a service in the Symfony configuration file services.yaml. Add the following code under the services section:

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# config/services.yaml

services:
    AppTwigMyTwigExtension:
        tags: [twig.extension]

1. Clear the Symfony cache by running the command php bin/console cache:clear in your project's root directory.
2. Now you can use your custom filter my_filter in Twig templates. For example:

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{{ some_variable|my_filter }}

The some_variable will be passed as the input parameter to the myFilterFunction method in the MyTwigExtension class, and the filtered value will be returned and displayed in the template.

Note: Make sure the Twig extension class is placed in the correct namespace and directory, and the service configuration is properly defined in the services.yaml file.