> For the complete documentation index, see [llms.txt](https://php-fhir-tools.ardenexal.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://php-fhir-tools.ardenexal.net/getting-started/installation.md).

# Installation

{% hint style="info" %}
**Requirements:** PHP 8.3 or newer and [Composer](https://getcomposer.org/). Packages that integrate with Symfony require Symfony `^6.4 | ^7.4`. Code generation additionally needs the `zip` extension.
{% endhint %}

## Standalone components

Install only the packages you need. Each is published independently and shares the `Ardenexal\FHIRTools\Component\…` namespace.

{% tabs %}
{% tab title="Serialization" %}

```bash
composer require ardenexal/fhir-serialization
```

`ardenexal/fhir-serialization` already depends on `ardenexal/fhir-models` (the pre-generated R4 / R4B / R5 model classes) and `ardenexal/fhir-metadata`, so they are pulled in automatically.
{% endtab %}

{% tab title="Validation" %}

```bash
composer require ardenexal/fhir-validation
```

Provides the Symfony Validator constraints and `FHIRValidationService`. It depends on `ardenexal/fhir-models` and `ardenexal/fhir-path`.
{% endtab %}

{% tab title="FHIRPath" %}

```bash
composer require ardenexal/fhir-path
```

Provides the FHIRPath 2.0 engine (`FHIRPathService`). Depends only on `ardenexal/fhir-metadata`, not on the model classes.
{% endtab %}

{% tab title="Code Generation" %}

```bash
composer require ardenexal/fhir-code-generation
```

Generates model classes from FHIR packages. Needs the `zip` extension and pulls in `nette/php-generator` for code emission.
{% endtab %}
{% endtabs %}

## Symfony application

```bash
composer require ardenexal/fhir-bundle
```

The bundle pulls in the code-generation, serialization, validation, FHIRPath, and metadata components and registers all of their services automatically. With Symfony Flex it also registers the bundle, copies the `config/packages/fhir.yaml` configuration, seeds `.env` variables (`FHIR_OUTPUT_DIRECTORY`, `FHIR_CACHE_DIRECTORY`, `FHIR_DEFAULT_VERSION`, `FHIR_VALIDATION_ENABLED`, `FHIR_VALIDATION_STRICT_MODE`), and updates `.gitignore`.

{% hint style="info" %}
Without Symfony Flex, register the bundle manually in `config/bundles.php` and copy the configuration files yourself. See [Installation & Configuration](/symfony-bundle/configuration.md) and the [Flex Recipe](/symfony-bundle/flex-recipe.md) for the full manual steps.
{% endhint %}


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