PHP Extension Requires Chilkat v11.7.0+

Get the Modules of a QR Code (Bit Matrix)

See more QR Code Examples

Demonstrates getting the QR code itself, as a grid of dark and light modules, to draw with something other than the built-in PNG and SVG output: on a canvas, in a PDF, on a display, or with a label printer language. With output.includeModuleData the response has symbols[0].moduleData, a bit matrix with one bit per module, each row starting on a new byte, most significant bit first, 1 for dark. The quiet zone is not part of the matrix. The example prints the symbol using two characters per module. PHP Extension

<?php

include("chilkat.php");

$success = false;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

$json = new CkJsonObject();
$json->UpdateString('payload.text','CHILKAT');
$json->UpdateBool('output.includeModuleData',true);

$fmt = new CkFormats();
$jsonOut = new CkJsonObject();
$success = $fmt->QrCode('generate',$json,$jsonOut);
if ($success == false) {
    print $fmt->lastErrorText() . "\n";
    exit;
}

$width = $jsonOut->IntOf('symbols[0].moduleData.width');
$height = $jsonOut->IntOf('symbols[0].moduleData.height');
$rowBytes = $jsonOut->IntOf('symbols[0].moduleData.rowBytes');
print 'kind: ' . $jsonOut->stringOf('symbols[0].moduleData.kind') . "\n";
print 'modules: ' . $width . ' x ' . $height . ', ' . $rowBytes . ' bytes per row' . "\n";

//  The matrix is height rows of rowBytes bytes.
$bd = new CkBinData();
$success = $bd->AppendEncoded($jsonOut->stringOf('symbols[0].moduleData.bytesBase64'),'base64');
if ($success == false) {
    print $bd->lastErrorText() . "\n";
    exit;
}

$sbRow = new CkStringBuilder();

$mask = 128;
for ($row = 0; $row <= $height - 1; $row++) {
    $sbRow->Clear();
    for ($col = 0; $col <= $width - 1; $col++) {
        //  The module at (col,row) is a bit of the byte at (row * rowBytes) + (col / 8).
        //  The leftmost module of each byte is its most significant bit.
        if (($col % 8) == 0) {
            $mask = 128;
        }

        $b = $bd->GetByte(($row * $rowBytes) + ($col / 8));
        if ((($b / $mask) % 2) == 1) {
            $sbRow->Append('##');
        }
        else {
            $sbRow->Append('  ');
        }

        $mask = $mask / 2;
    }

    print $sbRow->getAsString() . "\n";
}

//  The same symbol as the PNG that the call also returned:

//  

//  Sample output:

//  kind: bitMatrix
//  modules: 21 x 21, 3 bytes per row
//  ##############              ##############
//  ##          ##      ####    ##          ##
//  ##  ######  ##  ##  ####    ##  ######  ##
//  ##  ######  ##  ##          ##  ######  ##
//  ##  ######  ##  ##  ##  ##  ##  ######  ##
//  ##          ##  ####  ##    ##          ##
//  ##############  ##  ##  ##  ##############
//                  ####
//  ##  ##########      ####    ##########
//      ####          ##  ########    ######
//  ####  ########    ####  ##  ####      ####
//        ##  ##      ############    ####  ##
//    ######  ####  ######  ##    ##  ##
//                  ##  ##  ##    ##  ##    ##
//  ##############        ##  ##    ##      ##
//  ##          ##  ##  ##        ######  ####
//  ##  ######  ##  ####  ##  ##    ##
//  ##  ######  ##  ##  ############    ##
//  ##  ######  ##  ##      ##  ####  ##
//  ##          ##    ##  ########          ##
//  ##############  ##      ##      ######

?>