Official LaunchDarkly SDK for PHP


Code Climate

Circle CI


  1. PHP 5.5 or higher.

Quick setup

  1. Install the PHP SDK and monolog for logging with Composer

     php composer.phar require launchdarkly/launchdarkly-php
  2. After installing, require Composer's autoloader:

     require 'vendor/autoload.php';
  3. Create a new LDClient with your SDK key:

     $client = new LaunchDarkly\LDClient("your_sdk_key");

Your first feature flag

  1. Create a new feature flag on your dashboard

  2. In your application code, use the feature's key to check whether the flag is on for each user:

     $user = new LaunchDarkly\LDUser("user@test.com");
     if ($client->variation("your.flag.key", $user)) {
         # application code to show the feature
     } else {
         # the code to run if the feature is off

Fetching flags

There are two approaches to fetching the flag rules from LaunchDarkly:

  • Making HTTP requests (using Guzzle)
  • Setting up the ld-daemon to store the flags in Redis

Using Guzzle

To use Guzzle it must be required as a dependency:

php composer.phar require "guzzlehttp/guzzle:6.2.1"
php composer.phar require "kevinrob/guzzle-cache-middleware:1.4.1"

It will then be used as the default way of fetching flags.

Using Redis

  1. Require Predis as a dependency:

    php composer.phar require "predis/predis:1.0.*"

  2. Create the LDClient with the Redis feature requester as an option:

    $client = new LaunchDarkly\LDClient("your_sdk_key", ['feature_requester_class' => 'LaunchDarkly\LDDFeatureRequester']);

Learn more

Check out our documentation for in-depth instructions on configuring and using LaunchDarkly. You can also head straight to the complete reference guide for this SDK.


We encourage pull-requests and other contributions from the community. We've also published an SDK contributor's guide that provides a detailed explanation of how our SDKs work.

About LaunchDarkly