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LaunchDarkly sample PHP application

We've built a simple console application that demonstrates how LaunchDarkly's SDK works.

Below, you'll find the build procedure. For more comprehensive instructions, you can visit your Quickstart page or the PHP reference guide.

This demo requires PHP 8.1 or higher.

Build instructions

  1. Set the environment variable LAUNCHDARKLY_SDK_KEY to your LaunchDarkly SDK key. If there is an existing boolean feature flag in your LaunchDarkly project that you want to evaluate, set LAUNCHDARKLY_FLAG_KEY to the flag key; otherwise, a boolean flag of sample-feature will be assumed.

    export LAUNCHDARKLY_SDK_KEY="1234567890abcdef"
    export LAUNCHDARKLY_FLAG_KEY="my-boolean-flag"
  2. On the command line, install the dependencies with composer install.

  3. On the command line, run php main.php

You should receive the message "The feature flag evaluates to .". The application will run continuously and react to the flag changes in LaunchDarkly.