Tcpdf Bundle Laravel Package

Getting Started

Minimal Steps

1. Installation:

   composer require acucchieri/tcpdf-bundle
   

   Ensure Composer is installed globally.

2. Enable the Bundle: Add to config/bundles.php (Symfony 4.3+):

   return [
       // ...
       AC\TcpdfBundle\ACTcpdfBundle::class => ['all' => true],
   ];
   

   (Note: Update from AppKernel.php to config/bundles.php for modern Symfony versions.)

3. First PDF Generation: Inject PdfBuilder into a controller/service:

   use AC\TcpdfBundle\Pdf\PdfBuilder;
   
   public function generatePdf(PdfBuilder $pdfBuilder)
   {
       $pdf = $pdfBuilder->create();
       $pdf->AddPage();
       $pdf->SetFont('helvetica', 'B', 16);
       $pdf->Cell(0, 10, 'Hello, TCPDF in Symfony!', 0, 1, 'C');
       return $pdf->output('example.pdf', 'D'); // 'D' = download
   }
   

First Use Case

Generate a simple invoice PDF with dynamic data:

$pdf = $pdfBuilder->create();
$pdf->AddPage();
$pdf->SetFont('helvetica', '', 12);
$pdf->Cell(0, 10, "Invoice #{$invoice->id}", 0, 1, 'L');
$pdf->Ln(10);
$pdf->writeHTML("<table><tr><td>Item</td><td>Price</td></tr></table>", true, false, true, false, '');
return $pdf->output('invoice_{$invoice->id}.pdf', 'D');

Implementation Patterns

Core Workflows

1. Dependency Injection: Always inject PdfBuilder into controllers/services for reusability:

   public function __construct(private PdfBuilder $pdfBuilder) {}
   

2. Reusable PDF Templates: Create a service to encapsulate PDF logic:

   // src/Service/PdfGenerator.php
   class PdfGenerator {
       public function __construct(private PdfBuilder $pdfBuilder) {}
   
       public function generateReport(array $data): string {
           $pdf = $this->pdfBuilder->create();
           $pdf->AddPage();
           $pdf->writeHTML($this->renderReportHtml($data));
           return $pdf->output('report.pdf', 'S'); // 'S' = send to browser
       }
   }
   

3. Dynamic Content Injection: Use TCPDF’s methods (Cell(), writeHTML(), MultiCell()) with Symfony’s twig:

   $html = $this->twig->render('pdf/report.html.twig', ['data' => $data]);
   $pdf->writeHTML($html);
   

4. Streaming Large PDFs: For memory efficiency, stream directly to response:

   $response = new StreamedResponse(function () use ($pdf) {
       echo $pdf->Output('large_report.pdf', 'D');
   });
   return $response;
   

Integration Tips

• Twig Integration: Extend Twig with TCPDF filters for reusable PDF components:

  // src/Twig/PdfExtension.php
  class PdfExtension extends \Twig\Extension\AbstractExtension {
      public function getFilters() {
          return [
              new \Twig\TwigFilter('pdf_table', [$this, 'renderTable']),
          ];
      }
  }
  

  Use in Twig:

  {{ data|pdf_table }}
  

• Event-Driven PDFs: Trigger PDF generation via Symfony events (e.g., post-order confirmation):

  // src/EventListener/OrderListener.php
  class OrderListener {
      public function __construct(private PdfGenerator $pdfGenerator) {}
  
      public function onOrderConfirmed(OrderEvent $event) {
          $this->pdfGenerator->generateInvoice($event->getOrder());
      }
  }
  

• Configuration: Override TCPDF defaults in config/packages/ac_tcpdf.yaml:

  ac_tcpdf:
      default:
          format: 'a4'
          orientation: 'P'
          unit: 'mm'
          font_size: 10
          font: 'helvetica'
  

Gotchas and Tips

Pitfalls

1. Bundle Registration:

   • Symfony 4.3+: Use config/bundles.php (not AppKernel.php).
   • Symfony < 4.3: Ensure ACTcpdfBundle is in the registerBundles() array.
   • Error: ClassNotFoundException → Verify Composer autoload (composer dump-autoload).

2. Memory Limits:

   • TCPDF can exhaust memory for large PDFs. Use Output() with streaming:

     $pdf->Output('large_file.pdf', 'D', true); // Force download + streaming
     

   • Fix: Increase PHP memory (ini_set('memory_limit', '512M')) or optimize content.

3. Font Paths:

   • TCPDF requires font files (e.g., helvetica.php). Ensure they’re copied to vendor/tecnickcom/tcpdf/fonts/.
   • Fix: Manually copy fonts or use a custom font path:

     $pdf->SetFont('dejavusans', '', 12, '', true);
     

4. Caching Issues:

   • TCPDF caches compiled PDFs. Clear cache if changes aren’t reflected:

     php bin/console cache:clear
     

   • Debug: Disable caching temporarily:

     $pdf->setPrintHeader(false);
     $pdf->setPrintFooter(false);
     

Debugging

1. TCPDF Errors:

   • Enable TCPDF error logging:

     $pdf->setErrorAction('error');
     $pdf->SetErrorHandler('myErrorHandler');
     

   • Check Symfony logs (var/log/dev.log) for TCPDF exceptions.

2. Output Issues:

   • Blank PDF: Verify AddPage() is called before content.
   • Corrupted PDF: Ensure no unclosed tags in writeHTML() (e.g., <table> must close).

3. Symfony Response Conflicts:

   • Avoid mixing output() with Symfony’s Response:

     // Wrong:
     return $pdf->output('file.pdf', 'D'); // Returns string, not Response
     
     // Correct:
     return new Response($pdf->Output('file.pdf', 'S'), 200, ['Content-Type' => 'application/pdf']);
     

Extension Points

1. Custom TCPDF Classes: Extend PdfBuilder to add methods:

   // src/Pdf/CustomPdfBuilder.php
   class CustomPdfBuilder extends PdfBuilder {
       public function addLogo(string $path, float $width = 30) {
           $this->Image($path, 10, 10, $width);
       }
   }
   

   Bind to Symfony’s container:

   # config/services.yaml
   services:
       App\Pdf\CustomPdfBuilder:
           tags: ['ac_tcpdf.pdf_builder']
   

2. Hooks for Pre/Post Processing: Use Symfony’s compiler passes to modify TCPDF behavior:

   // src/DependencyInjection/Compiler/PdfPass.php
   class PdfPass implements CompilerPassInterface {
       public function process(ContainerBuilder $container) {
           $definition = $container->findDefinition('ac_tcpdf.pdf_builder');
           $definition->addMethodCall('setCustomHeader', ['My Header']);
       }
   }
   

3. Dynamic Font Loading: Load fonts dynamically from a database:

   $pdf->AddFont('custom_font', '', 'custom_font.php', true);
   

Performance Tips

• Reuse PDF Instances: Cache PdfBuilder instances for repeated use:

  # config/services.yaml
  services:
      App\Service\PdfGenerator:
          arguments:
              $pdfBuilder: '@ac_tcpdf.pdf_builder'
  

• Lazy-Load Content: Stream data in chunks for large PDFs:

  $pdf->startTransaction();
  foreach ($largeData as $item) {
      $pdf->Cell(0, 5, $item->name);
      $pdf->endTransaction();
      $pdf->startTransaction();
  }