Example scripts
 Chapter 27. QR (2D-Barcode) 

Example scripts

The following sections shows a number of example script that can be used as a base for further refinement.

Example 1 - Store QR code to file

QR Barcode with specified version and stored to a file

Example 27.6. Storing image to a file (qrexample03.php) 

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<?php
    // Example 3 : QR Barcode with specified version and stored to a file
 
    // Include the library
    require_once ('jpgraph/QR/qrencoder.inc.php');
 
    // Data to be encoded
    $data = '01234567';
    $version = 3;  // Use QR version 3
    $fileName = 'qrexample03.png';
 
    // Create a new instance of the encoder and let the library
    // decide a suitable error level
    $encoder = new QREncoder($version);
 
    // Use the image backend
    $backend = QRCodeBackendFactory::Create($encoder, BACKEND_IMAGE);
 
    // Set the module size (quite big)
    $backend->SetModuleWidth(5);
 
    // Store the barcode in the specifed file
    $backend->Stroke($data,$fileName);
    list($version,$errorcorrection) = $backend->GetQRInfo();
 
    echo "QR Barcode, (<b>Version: $version-$errorcorrection</b>), image stored in file $fileName";
?>


Example 2 - Specified error correction level

QR Barcode with specified version and error correction level

Example 27.7. Specified error correction level (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);
?>


Figure 27.14. Specified error correction level (qrexample04.php)

Specified error correction level (qrexample04.php)


Example 3 - Manual specified encoding

QR Barcode with manually specified encodation

Example 27.8. QR Barcode with manually specified encodation (qrexample05.php) 

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<?php
    // Example 5 : QR Barcode with manually specified encodation
 
    // Include the library
    require_once ('jpgraph/QR/qrencoder.inc.php');
 
    // Data to be encoded
    // We want the data to be encoded using alphanumeric encoding even though
    // it is only numbers
    $data = array(
        array(QREncoder::MODE_ALPHANUM,'01234567')
    );
 
    $version = 3;  // Use QR version 3
    $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(4);
 
    // Store the barcode in the specifed file
    $backend->Stroke($data);
?>


Figure 27.15. QR Barcode with manually specified encodation (qrexample05.php)

QR Barcode with manually specified encodation (qrexample05.php)


Example 4 - JPEG image format

QR Barcode with image in JPG format

Example 27.9. QR Barcode with image in JPG format (qrexample06.php) 

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<?php
    // Example 6 : QR Barcode with image in JPG format
 
    // Include the library
    require_once ('jpgraph/QR/qrencoder.inc.php');
 
    $data      = 'ABCDEFGH01234567'; // Data to be encoded
    $version   = -1;  // -1 = Let the library decide version (same as default)
    $corrlevel = -1; // -1 = Let the library decide error correction level (same as default)
 
    // 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);
 
    // Use JPEG format with 80% quality level
    $backend->SetImgFormat('jpeg',80);
 
    // Set the module size
    $backend->SetModuleWidth(4);
 
    // Store the barcode in the specifed file
    $backend->Stroke($data);
?>


Figure 27.16. QR Barcode with image in JPG format (qrexample06.php)

QR Barcode with image in JPG format (qrexample06.php)


Example 5 - Multiple manual encoding

QR Barcode with multiple manually specified encodation schema.

Note

Normally there would be no need to ever use manually specified encodation)

Example 27.10. multiple manually specified encodation schema. (qrexample07.php) 

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<?php
    // Example 7 : QR Barcode with multiple manually specified encodation schemas
    // (Note: Normally there would be no need to ever use manually specified encodation)
 
    // Include the library
    require_once ('jpgraph/QR/qrencoder.inc.php');
 
    // Data to be encoded
    $data = array(
        array(QREncoder::MODE_ALPHANUM,'01234567'),
        array(QREncoder::MODE_NUMERIC,'89012345')
    );
 
    // Create a new instance of the encoder (automatically determined QR version and
    // error correction level)
    $encoder = new QREncoder();
 
    // Use the image backend
    $backend = QRCodeBackendFactory::Create($encoder, BACKEND_IMAGE);
 
    // Set the module size
    $backend->SetModuleWidth(4);
 
    // Store the barcode in the specifed file
    $backend->Stroke($data);
?>


Figure 27.17. multiple manually specified encodation schema. (qrexample07.php)

multiple manually specified encodation schema. (qrexample07.php)


Example 6 - Reading data from file

QR Barcode with data read from file

Example 27.11. data read from file (qrexample08.php) 

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<?php
    // Example 8 : QR Barcode with data read from file
 
    // Include the library
    require_once ('jpgraph/jpgraph.php');
    require_once ('jpgraph/QR/qrencoder.inc.php');
 
    $readFromFilename = 'qr-input.txt';
 
    // Create a new instance of the encoder and let the library
    // decide a suitable QR version and error level
    $encoder=new QREncoder();
 
    // Use the image backend
    $backend=QRCodeBackendFactory::Create($encoder, BACKEND_IMAGE);
 
    // Set the module size (quite big)
    $backend->SetModuleWidth(5);
 
    // .. send the barcode back to the browser for the data in the file
    $backend->StrokeFromFile($readFromFilename);
?>


Figure 27.18. data read from file (qrexample08.php)

data read from file (qrexample08.php)


Example 7 - Adjusting colors

QR Barcode with data read from file and different colors

Example 27.12.  (qrexample09.php) 

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<?php
    // Example 9 : QR Barcode with data read from file and different colors
 
    // Include the library
    require_once ('jpgraph/jpgraph.php');
    require_once ('jpgraph/QR/qrencoder.inc.php');
 
    $readFromFilename = 'qr-input.txt';
 
    // Create a new instance of the encoder and let the library
    // decide a suitable QR version and error level
    $encoder = new QREncoder();
 
    // Use the image backend
    $backend = QRCodeBackendFactory::Create($encoder, BACKEND_IMAGE);
 
    // Set the module size (quite big)
    $backend->SetModuleWidth(5);
 
    // Use blue and white colors instead
    $backend->SetColor('navy','white');
 
    // .. send the barcode back to the browser for the data in the file
    $backend->StrokeFromFile($readFromFilename);
?>


Figure 27.19.  (qrexample09.php)

(qrexample09.php)


Example 8 - Setting error correction level

Specified error correction level

Example 27.13. Specified error correction level (qrexample10.php) 

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<?php
    // Example 10 : Specified error correction level
 
    // Include the library
    require_once ('jpgraph/QR/qrencoder.inc.php');
 
    $data      = 'ABCDEFGH01234567'; // Data to be encoded
    $version   = -1;  // -1 = Let the library decide version (same as default)
    $corrlevel = QRCapacity::ErrH; // Error correction level H (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);
 
    // Set color
    $backend->SetColor('brown','white');
 
    // Store the barcode in the specifed file
    $backend->Stroke($data);
?>


Figure 27.20. Specified error correction level (qrexample10.php)

Specified error correction level (qrexample10.php)


Example 9 - Generating ASCII output

Using the ASCII backend

Example 27.14. Using the ASCII backend (qrexample12.php) 

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<?php
// Include the library
require_once ('jpgraph/QR/qrencoder.inc.php');
 
// Example 11 : Generate postscript output
 
$data         = 'ABCDEFGH01234567'; // Data to be encoded
$version      = -1;  // -1 = Let the library decide version (same as default)
$corrlevel    = QRCapacity::ErrH; // Error correction level H (Highest possible)
$modulewidth  = 1;
 
// 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_ASCII);
 
// Set the module size
$backend->SetModuleWidth($modulewidth);
 
// Store the barcode in the specifed file
$ps_str = $backend->Stroke($data);
 
echo '<pre>'.$ps_str.'</pre>';
?>


Figure 27.21. QR With ASCII rendering

QR With ASCII rendering

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