Feature flippers for PHP. A port of ruby's rollout.

composer require opensoft/rollout

Initialize a rollout object:

use Opensoft\Rollout\Rollout;
use Opensoft\Rollout\Storage\ArrayStorage;

$rollout = new Rollout(new ArrayStorage());

Check if a feature is active for a particular user:

$rollout->isActive('chat', $user);  // returns true/false

Check if a feature is activated globally:

$rollout->isActive('chat'); // returns true/false

There are a number of different storage implementations for where the configuration for the rollout is stored.

• ArrayStorage - default storage, not persistent
• DoctrineCacheStorageAdapter - requires doctrine/cache
• PDOStorageAdapter - persistent using PDO
• RedisStorageAdapter - persistent using Redis
• MongoDBStorageAdapter - persistent using Mongo

All storage adapters must implement Opensoft\Rollout\Storage\StorageInterface.

Rollout ships with one group by default: all, which does exactly what it sounds like.

You can activate the all group for chat features like this:

$rollout->activateGroup('chat', 'all');

You may also want to define your own groups. We have one for caretakers:

$rollout->defineGroup('caretakers', function(RolloutUserInterface $user = null) {
  if (null === $user) {
    return false;
  }

  return $user->isCaretaker(); // boolean
});

You can activate multiple groups per feature.

Deactivate groups like this:

$rollout->deactivateGroup('chat');

You may want to let a specific user into a beta test or something. If that user isn't part of an existing group, you can let them in specifically:

$rollout->activateUser('chat', $user);

Deactivate them like this:

$rollout->deactivateUser('chat', $user);

Rollout users must implement the RolloutUserInterface.

If you're rolling out a new feature, you may want to test the waters by slowly enabling it for a percentage of your users.

$rollout->activatePercentage('chat', 20);

The algorithm for determining which users get let in is this:

crc32($user->getRolloutIdentifier()) % 100 < $percentage

So, for 20%, users 0, 1, 10, 11, 20, 21, etc would be allowed in. Those users would remain in as the percentage increases.

Deactivate all percentages like this:

$rollout->deactivatePercentage('chat');

Note: Activating a feature for 100% of users will also make it activate globally. This is like calling $rollout->isActive() without a user object.

Deactivate everybody at once:

$rollout->deactivate('chat');

You may wish to disable features programmatically if monitoring tools detect unusually high error rates for example.

After a feature becomes mainstream or a failed experiment, you may want to remove the feature definition from rollout.

$rollout->remove('chat');

Note: If there is still code referencing the feature, it will be recreated with default settings.

A Symfony2 bundle is available to integrate rollout into Symfony2 projects. It can be found at http://github.com/opensoft/OpensoftRolloutBundle.

A Zend Framework 2 module is availabile to intergrate rollout into Zend Framwork 2 projects. It can be found at https://github.com/adlogix/zf2-opensoft-rollout.

• Ruby: http://github.com/FetLife/rollout
• Python: http://github.com/asenchi/proclaim

Copyright © 2017 James Golick, BitLove, Inc. See LICENSE for details.