PHP Extension Requires Chilkat v11.7.0+

QR Code Colors and Transparent Background

See more QR Code Examples

Demonstrates colored QR codes. render.foreground is the color of the dark modules and render.background the color behind them, each as #RRGGBB. Either can instead be an object with a color and an opacity from 0 to 1, and a background opacity of 0 gives a PNG with a transparent background to place over a page or a design. Readers need contrast: keep the modules clearly darker than whatever ends up behind them. 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.

$fmt = new CkFormats();
$jsonOut = new CkJsonObject();

//  Dark blue modules on a pale yellow background.
$json = new CkJsonObject();
$json->UpdateString('payload.text','https://www.chilkatsoft.com/');
$json->UpdateInt('render.moduleSize',6);
$json->UpdateString('render.foreground','#1B3A6B');
$json->UpdateString('render.background','#FFF8DC');
$json->UpdateString('output.path','qa_output/qr_blue.png');
$json->UpdateBool('output.overwrite',true);
$json->UpdateString('output.return','none');
$success = $fmt->QrCode('generate',$json,$jsonOut);
if ($success == false) {
    print $fmt->lastErrorText() . "\n";
    exit;
}

print 'colored: ' . $jsonOut->stringOf('outputs[0].path') . ', ' . $jsonOut->IntOf('outputs[0].byteCount') . ' bytes' . "\n";

//  The image written to qa_output/qr_blue.png:

//  

//  The same modules on a fully transparent background.
$json2 = new CkJsonObject();
$json2->UpdateString('payload.text','https://www.chilkatsoft.com/');
$json2->UpdateInt('render.moduleSize',6);
$json2->UpdateString('render.foreground','#1B3A6B');
$json2->UpdateString('render.background.color','#FFFFFF');
$json2->UpdateNumber('render.background.opacity','0');
$json2->UpdateString('output.path','qa_output/qr_transparent.png');
$json2->UpdateBool('output.overwrite',true);
$json2->UpdateString('output.return','none');
$success = $fmt->QrCode('generate',$json2,$jsonOut);
if ($success == false) {
    print $fmt->lastErrorText() . "\n";
    exit;
}

print 'transparent: ' . $jsonOut->stringOf('outputs[0].path') . ', ' . $jsonOut->IntOf('outputs[0].byteCount') . ' bytes' . "\n";

//  qa_output/qr_transparent.png, placed here over a checkerboard and over a colored page
//  to show that whatever is behind the image shows through:

//  

//  Sample output:

//  colored: qa_output/qr_blue.png, 1345 bytes
//  transparent: qa_output/qr_transparent.png, 1377 bytes

?>