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# PHP OpenFeature provider

> Set up the Unleash OpenFeature provider for PHP to evaluate feature flags through the OpenFeature API.

The [Unleash OpenFeature PHP provider](https://github.com/Unleash/unleash-openfeature-php-provider) lets PHP applications evaluate Unleash feature flags through the [OpenFeature](https://openfeature.dev/) API.

The provider wraps the [Unleash PHP SDK](/sdks/php) and uses the same backend SDK behavior for fetching and caching feature flag data, local evaluation, and metrics.

## Requirements

* PHP 8.4 or later

## Installation

Install the provider with Composer. The provider declares the OpenFeature PHP SDK and the [Unleash PHP SDK](/sdks/php) as dependencies, together with default HTTP client and cache implementations, so you don't need to add them separately.

```bash
composer require unleash/openfeature-provider
```

## Configuration

Create an `UnleashBuilder` with the same [options](/sdks/php#builder) you would use to configure the Unleash PHP SDK client, then pass it to an `UnleashFlagProvider` and register the provider with OpenFeature. The provider builds the Unleash client from the builder.

```php
<?php

use OpenFeature\OpenFeatureAPI;
use Unleash\Client\UnleashBuilder;
use Unleash\OpenFeature\Provider\UnleashFlagProvider;

$builder = UnleashBuilder::create()
    ->withAppName('my-php-app')
    ->withAppUrl('<YOUR_UNLEASH_URL>/api')
    ->withInstanceId('my-php-app-1')
    ->withHeader('Authorization', '<YOUR_API_TOKEN>');

OpenFeatureAPI::getInstance()->setProvider(new UnleashFlagProvider($builder));
```

To log provider diagnostics, such as discarded context fields, pass a [PSR-3](https://www.php-fig.org/psr/psr-3/) logger as the second constructor argument: `new UnleashFlagProvider($builder, $logger)`.

## Evaluate a flag

Build an OpenFeature client and evaluate flags through the OpenFeature API:

```php
<?php

use OpenFeature\implementation\flags\EvaluationContext;

$client = OpenFeatureAPI::getInstance()->getClient();

$context = new EvaluationContext('user-123');

$enabled = $client->getBooleanValue('my-feature', false, $context);
```

The provider supports all OpenFeature evaluation methods. Boolean evaluation uses the flag's enabled state. All other types resolve from the payload of the flag's [variant](/concepts/feature-flag-variants):

* String values accept `string` and `csv` payloads.
* Integer and float values accept `number` payloads.
* Object values accept `json` payloads.

If the flag doesn't exist, the flag is disabled, or the variant payload is missing, has a different type, or can't be parsed, the evaluation returns the default value. The detail methods, such as `getBooleanDetails`, additionally report the evaluation reason and the assigned variant name.

## Context mapping

The provider maps the OpenFeature evaluation context to an [Unleash context](/concepts/unleash-context) before each evaluation.

The following OpenFeature fields map directly to top-level Unleash context fields:

* `currentTime`
* `userId`
* `sessionId`
* `remoteAddress`
* `environment`

If you set a targeting key, the provider maps it to `userId`. The targeting key takes precedence over a `userId` field set on the evaluation context. The `appName` comes from the builder configuration, not the evaluation context.

The provider adds all other scalar fields, such as strings, numbers, booleans, and date-time values, to the Unleash context [properties](/concepts/unleash-context#the-properties-field). It discards nested values, such as arrays.

## Example

To try the provider against your Unleash instance, clone the [provider repository](https://github.com/Unleash/unleash-openfeature-php-provider) and run the [boolean flag example](https://github.com/Unleash/unleash-openfeature-php-provider/blob/main/examples/boolean_flag.php) with your Unleash URL and API token:

```bash
composer install
php examples/boolean_flag.php \
  --url '<YOUR_UNLEASH_URL>/api' \
  --api-key "$UNLEASH_API_KEY" \
  --flag-key my-feature \
  --targeting-key user-123
```

> Set up the Unleash OpenFeature provider for PHP to evaluate feature flags through the OpenFeature API.