Langfuse PHP - A PHP Client for Langfuse API

This package provides a wrapper around the Langfuse Api, allowing you to easily integrate Langfuse into your PHP applications. It uses as few dependencies as possible.

This package supports the following features:

Prompts

• Get text prompts
• Get chat prompts
• Compile text prompts
• Compile chat prompts
• Create text prompts
• Create chat prompts
• Fallback handling for prompt fetching errors
• Fallback handling when no prompt is found

Ingestion

• Create traces
• Create generations

Requires PHP 8.3 or PHP 8.4

⚡️ Install the package using Composer:

composer require dij-digital/langfuse-php  

How to use this package

Prompt

use DIJ\Langfuse\PHP;
use DIJ\Langfuse\PHP\Transporters\HttpTransporter;  
use GuzzleHttp\Client;

$langfuse = new Langfuse(new HttpTransporter(new Client([  
  'base_uri' => 'https://cloud.langfuse.com', //choose as needed
    'auth' => ['PUBLIC_KEY', 'SECRET_KEY'],  //generate a set in your project
])));

$langfuse->prompt()->text(promptName: 'promptName')->compile(params: ['key' => 'value']);
$langfuse->prompt()->text(promptName: 'promptName')->compile(params: ['key' => 'value']);
$langfuse->prompt()->chat(promptName: 'chatName')->compile(params: ['key' => 'value']);
$langfuse->prompt()->list();
$langfuse->prompt()->create(promptName: 'promptName', prompt: 'text', type: PromptType::TEXT);

Ingestion

use DIJ\Langfuse\PHP;

// Creates a trace and a generation visible in Langfuse UI
$traceId = 'trace-id-123';

$langfuse->ingestion()->trace(
    input: 'prompt text',
    output: null,
    traceId: $traceId,
    name: 'name',
    sessionId: null,
    metadata: ['key' => 'value']
);

$langfuse->ingestion()->generation(
    input: 'prompt text',
    output: 'model output',
    traceId: $traceId,
    name: 'name',
    sessionId: null,
    promptName: 'promptName',
    promptVersion: 1,
    model: 'gpt-4o',
    modelParameters: ['temperature' => 0.7],
    metadata: ['key' => 'value']
);

Langfuse PHP was created by Tycho Engberink and is maintained by DIJ Digital under the MIT license.