qrexample04.php
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<?php
    // Example 4 : QR Barcode with specified version and error correction level
 
    // Include the library
    require_once ('jpgraph/QR/qrencoder.inc.php');
 
    // Data to be encoded
    $data = '01234567';
    $version = 12;  // Use QR version 4
    $corrlevel = QRCapacity::ErrH ; // Level H error correction (the highest possible)
 
    // Create a new instance of the encoder using the specified
    // QR version and error correction
    $encoder = new QREncoder($version,$corrlevel);
 
    // Use the image backend
    $backend = QRCodeBackendFactory::Create($encoder, BACKEND_IMAGE);
 
    // Set the module size
    $backend->SetModuleWidth(3);
 
    // Store the barcode in the specifed file
    $backend->Stroke($data);
?>