Struktur PHP SDK

PHP adapter for the Struktur structured data extraction CLI. Zero runtime dependencies. Type-safe DTOs. Real-time event streaming.

What is Struktur?

Struktur converts documents (PDFs, text, images) into validated JSON using LLMs. You define a JSON Schema, pick a strategy, and it handles parsing, chunking, extraction, validation, retries, and deduplication. Works with OpenAI, Anthropic, Google, OpenRouter, and any OpenAI-compatible provider.

Installation

composer require mateffy/struktur

You also need the Struktur CLI. Choose one:

npm install -g @struktur/cli          # global npm install
bun install -g @struktur/cli          # global bun install

Requires PHP 8.2+.

Quick start

use Mateffy\Struktur\Client;
use Mateffy\Struktur\Input;
use Mateffy\Struktur\Dto\ExtractionRequest;

$client = new Client();

$result = $client->extract(new ExtractionRequest(
    inputs: [Input::fromPath('./invoice.pdf')],
    schema: [
        'type' => 'object',
        'properties' => [
            'invoice_number' => ['type' => 'string'],
            'total'          => ['type' => 'number'],
        ],
        'required' => ['invoice_number', 'total'],
    ],
    strategy: 'agent',
    model: 'openrouter/moonshotai/kimi-k2.5',
    tokens: ['openrouter' => getenv('OPENROUTER_API_KEY')],
));

// $result->data is a typed array matching your schema
echo $result->data['invoice_number']; // "INV-1042"
echo $result->usage->totalTokens;     // 420

Event streaming

The CLI emits typed NDJSON events on stderr. The SDK parses them in real time:

$client->extract(
    request: new ExtractionRequest(
        inputs: [Input::fromPath('./contract.pdf')],
        schema: $schema,
        model: 'openai/gpt-4o',
        strategy: 'agent',
        maxSteps: 200,
    ),
    onEvent: function (\Mateffy\Struktur\Dto\Event\ExtractionEvent $event) {
        match (true) {
            $event instanceof \Mateffy\Struktur\Dto\Event\StatusEvent =>
                printf("[%s] %s\n", $event->phase, $event->message['key'] ?? ''),

            $event instanceof \Mateffy\Struktur\Dto\Event\ToolStartEvent =>
                printf("tool start: %s\n", $event->toolName),

            $event instanceof \Mateffy\Struktur\Dto\Event\TokenUsageEvent =>
                printf("tokens: %d\n", $event->totalTokens),

            default => null,
        };
    }
);

Use StatusEvent for human-facing progress UIs — it carries a coarse, strategy-independent phase (starting, analyzing, extracting, retrying, completed, failed) so you can render localized status without matching internal tool names or step labels.

Image extraction

Enable images: true and use imagesOutput to receive extracted images as a virtual-path → base64 map:

$result = $client->extract(new ExtractionRequest(
    inputs: [Input::fromPath('./brochure.pdf')],
    schema: $schema,
    model: 'openrouter/moonshotai/kimi-k2.5',
    strategy: 'agent',
    images: true,
    imagesOutput: '/tmp/images.json',
    tokens: ['openrouter' => getenv('OPENROUTER_API_KEY')],
));

// $result->images['/images/artifact-…-page-1-image-1.png'] → base64 bytes

Direct parsing

Use parse() to convert files into artifact JSON (text + extracted images) without LLM extraction. Useful for pre-processing pipelines:

$result = $client->parse(new \Mateffy\Struktur\Dto\ParseRequest(
    inputs: [Input::fromPath('./report.pdf')],
    images: true,
    screenshots: true,
));

Provider tokens

Pass tokens per-request via ExtractionRequest::$tokens — no global env variables needed. The SDK maps provider names to environment variables:

Provider	Config key	Env variable
OpenAI	openai	OPENAI_API_KEY
Anthropic	anthropic	ANTHROPIC_API_KEY
Google	google	GOOGLE_GENERATIVE_AI_API_KEY
OpenRouter	openrouter	OPENROUTER_API_KEY
OpenCode	opencode	OPENCODE_API_KEY
Ollama	ollama	OLLAMA_BASE_URL

Tokens are injected as environment variable prefixes on the CLI command — never written to disk and never leak across requests.

Error handling

use Mateffy\Struktur\Exception\ProcessException;
use Mateffy\Struktur\Exception\ExtractionFailedException;

try {
    $result = $client->extract(...);
} catch (ProcessException $e) {
    // CLI binary not found or failed to start
} catch (ExtractionFailedException $e) {
    // Extraction exited with non-zero code or validation failure
}

Documentation

• Struktur docs — full documentation
• PHP tutorial — detailed walkthrough with Laravel examples
• Struktur monorepo — source code, issues, releases

License

FSL-1.1-MIT (Functional Source License, MIT future). See LICENSE.