Implementing Feature Toggles in Symfony

Feature toggles, also known as feature flags, are a powerful technique that allows developers to enable or disable features in a running application without deploying new code. This mechanism provides much flexibility in managing your features, allowing you to perform canary releases, A/B testing, and gradual rollouts. In this post, we’ll take a look at how to implement feature toggles in a Symfony application.

There are a couple of ways to implement feature toggles in Symfony, but we will use the FlagceptionBundlerobust feature flag bundle for Symfony that allows you to define and manage feature flags.

GitHub - bestit/flagception-bundle: Feature flags on steroids!

Installation

First, install the bundle via Composer:

composer require bestit/flagception-bundle

Configuration

After installation, you'll need to configure your feature flags. You can do this in the config/packages/flagception.yaml file:

flagception:
    features:
        'feature_one': true
        'feature_two': false