Claude API — PHP

Note: The PHP SDK is the official Anthropic SDK for PHP. Tool runner and Agent SDK are not available.

Installation

```bash composer require "anthropic-ai/sdk 0.5.0" ```

Client Initialization

```php use Anthropic\Client;

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

Basic Message Request

```php $message = $client->messages->create( model: 'claude-opus-4-6', maxTokens: 1024, messages: [ ['role' => 'user', 'content' => 'What is the capital of France?'], ], ); echo $message->content[0]->text; ```

Streaming

```php $stream = $client->messages->createStream( model: 'claude-opus-4-6', 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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