AI Document Processing: Extracting Intelligence from Files

Documents Are Unstructured Data

Business runs on documents—invoices, contracts, forms, reports. AI can extract structured data from these unstructured sources, automating manual data entry and enabling intelligent processing.

PDF Text Extraction

class DocumentProcessor
{
    public function extractText(string $path): string
    {
        $extension = pathinfo($path, PATHINFO_EXTENSION);

        return match ($extension) {
            'pdf' => $this->extractFromPDF($path),
            'docx' => $this->extractFromDocx($path),
            'jpg', 'png' => $this->extractFromImage($path),
            default => throw new UnsupportedDocumentException(),
        };
    }

    private function extractFromPDF(string $path): string
    {
        $parser = new PdfParser();
        $pdf = $parser->parseFile($path);
        return $pdf->getText();
    }
}

Invoice Data Extraction

class InvoiceExtractor
{
    public function extract(string $documentText): array
    {
        $prompt = <<ai->generate($prompt, ['temperature' => 0]), true);
    }
}

Contract Analysis

class ContractAnalyzer
{
    public function analyze(string $contractText): array
    {
        $prompt = <<ai->generate($prompt), true);
    }
}

Form Processing

class FormProcessor
{
    public function processForm(string $imagePath): array
    {
        // Use vision AI to read handwritten/printed forms
        $response = $this->ai->chat([
            ['role' => 'user', 'content' => [
                ['type' => 'text', 'text' => 'Extract all form fields and their values from this image.'],
                ['type' => 'image_url', 'image_url' => [
                    'url' => 'data:image/jpeg;base64,' . base64_encode(file_get_contents($imagePath))
                ]],
            ]],
        ]);

        return $this->parseFormData($response);
    }
}

Validation and Review

class ExtractionValidator
{
    public function validate(array $extracted, string $documentType): ValidationResult
    {
        $rules = $this->getRules($documentType);
        $errors = [];

        foreach ($rules as $field => $rule) {
            if (!$this->checkRule($extracted[$field] ?? null, $rule)) {
                $errors[$field] = "Failed validation: {$rule['message']}";
            }
        }

        return new ValidationResult(
            valid: empty($errors),
            errors: $errors,
            confidence: $this->calculateConfidence($extracted)
        );
    }
}

Conclusion

AI document processing automates tedious data entry and enables intelligent document workflows. Combine text extraction, AI analysis, and validation for reliable automated processing.