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Flagsmith Client

The SDK client for PHP Flagsmith allows you to manage feature flags and remote config across multiple projects, environments and organisations.

The source code for the client is available on Github.

Installing VIA composer

composer require bullettrainhq/bullet-train-php-client


Retrieving feature flags for your project. For full documentation visit

use BulletTrain\BulletTrain;

$bt = new BulletTrain('H8YyJ3vxBaSFVfX229MUFU');

$flags = $bt->getFlags();
foreach ($flags as &$value) {

Available Options

Property Description Required Default Value
environmentID Defines which project environment you wish to get flags for. example ACME Project - Staging. YES null

Available Functions

Property Description
getFlags() Trigger a manual fetch of the environment features, if a user is identified it will fetch their features
featureEnabled(key) Get the value of a particular feature e.g. bulletTrain.hasFeature("powerUserFeature") // true
featureEnabled(key, userId) Get the value of a particular feature for a user e.g. bulletTrain.hasFeature("powerUserFeature", 1234) // true
getValue(key) Get the value of a particular feature e.g. bulletTrain.getValue("font_size") // 10
getValue(key, userId) Get the value of a particular feature for a specificed user e.g. bulletTrain.getValue("font_size", 1234) // 15
setTrait(userId, key, value) Sets a trait for a particular user e.g. bulletTrain.setTrait(1234, "accepted_cookie_policy", true)
getTraits(userId) Gets all the traits for the Identity


Please read Contributing for details on our code of conduct, and the process for submitting pull requests to us.

Getting Help

If you encounter a bug or feature request we would like to hear about it. Before you submit an issue please search existing issues in order to prevent duplicates.

Get in touch

If you have any questions about our projects you can email