> ## Documentation Index
> Fetch the complete documentation index at: https://docs.instructorphp.com/llms.txt
> Use this file to discover all available pages before exploring further.

Instructor for PHP is a lightweight library that makes it easy to get structured outputs from Large Language Models (LLMs). Built on top of modern PHP 8.3+ features, it provides a simple, type-safe way to work with AI models.

## Key Features

* **Type Safety**: Full PHP 8.3+ type system support with strict typing
* **Multiple LLM Support**: Works with OpenAI, Anthropic, Gemini, Cohere, and more
* **Validation**: Built-in validation with custom rules and LLM-powered validation
* **Streaming**: Real-time partial object updates for better UX
* **Function Calling**: Native support for LLM function/tool calling
* **Zero Dependencies**: Clean, lightweight implementation

## Quick Example

```php theme={null}
<?php
use Cognesy\Instructor\StructuredOutput;

class Person {
    public string $name;
    public int $age;
    public string $occupation;
}

$text = "Extract: Jason is 25 years old and works as a software engineer.";

$person = (new StructuredOutput)
    ->withResponseClass(Person::class)
    ->withMessages($text)
    ->get();

echo $person->name; // "Jason"
echo $person->age;  // 25
echo $person->occupation; // "software engineer"
```

## Getting Started

Choose your path:

* **[Quick Start](/packages/instructor/quickstart)** - Get up and running in 5 minutes
* **[Setup Guide](/packages/instructor/setup)** - Detailed installation and configuration
* **[Cookbook](/cookbook/introduction)** - Practical examples and recipes

## Architecture

This project consists of several modular packages:

* **[Instructor](/packages/instructor/introduction)** - Main structured output library
* **[Polyglot](/packages/polyglot/overview)** - Low-level LLM abstraction layer
* **[HTTP Client](/packages/http/1-overview)** - Flexible HTTP client for API calls
* **[HTTP Pool](/packages/http/6-pooling)** - Concurrent request execution for fan-out workloads

## Community

* **GitHub**: [cognesy/instructor-php](https://github.com/cognesy/instructor-php)
* **Issues**: [Report bugs or request features](https://github.com/cognesy/instructor-php/issues)
* **Discussions**: [Join the conversation](https://github.com/cognesy/instructor-php/discussions)

***

*Instructor for PHP - Making AI outputs predictable and type-safe.*