Claude API — PHP

Note: The PHP SDK is the official Anthropic SDK for PHP. Tool runner and Agent SDK are not available. Bedrock, Vertex AI, and Foundry clients are supported.

Installation

```bash composer require "anthropic-ai/sdk" ```

Client Initialization

```php use Anthropic\Client;

// Using API key from environment variable $client = new Client(apiKey: getenv("ANTHROPIC_API_KEY")); ```

Amazon Bedrock

```php use Anthropic\BedrockClient;

$client = new BedrockClient( region: 'us-east-1', ); ```

Google Vertex AI

```php use Anthropic\VertexClient;

$client = new VertexClient( region: 'us-east5', projectId: 'my-project-id', ); ```

Anthropic Foundry

```php use Anthropic\FoundryClient;

$client = new FoundryClient( authToken: getenv("ANTHROPIC_AUTH_TOKEN"), ); ```

Basic Message Request

```php $message = $client->messages->create( model: '{{OPUS_ID}}', maxTokens: 1024, messages: [ ['role' => 'user', 'content' => 'What is the capital of France?'], ], ); echo $message->content[0]->text; ```

Streaming

```php $stream = $client->messages->createStream( model: '{{OPUS_ID}}', maxTokens: 1024, messages: [ ['role' => 'user', 'content' => 'Write a haiku'], ], );

foreach ($stream as $event) { echo $event; } ```

Tool Use (Manual Loop)

The PHP SDK supports raw tool definitions via JSON schema. See the shared tool use concepts for the tool definition format and agentic loop pattern.

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