<?php
  require_once('jpgraph/datamatrix/datamatrix.inc.php');
  
  $data = 'This is a 64x64 datamatrix symbol';
  
  // Create and set parameters for the encoder
  $encoder = DatamatrixFactory::Create(DMAT_64x64);
  $encoder->SetEncoding(ENCODING_TEXT);
  
  // Create the image backend (default)
  $backend = DatamatrixBackendFactory::Create($encoder);
  $backend->SetModuleWidth(3);
  
  // Adjust the Quiet zone
  $backend->SetQuietZone(10);
  
  // Create the barcode from the given data string and write to output file
  try {
      $backend->Stroke($data);
  } catch (Exception $e) {
      $errstr = $e->GetMessage();
      echo "Datamatrix error message: $errstr\n";
  }
  
  ?>