<?php
/**
* QR Code + Logo Generator
*
* http://labs.nticompassinc.com
*/
$data = isset($_GET) ? $_GET : 'http://labs.nticompassinc.com';
$size = isset($_GET) ? $_GET : '200x200';
$logo = isset($_GET) ? $_GET : FALSE;

header('Content-type: image/png');
// Get QR Code image from Google Chart API
// http://code.google.com/apis/chart/infographics/docs/qr_codes.html
$QR = imagecreatefrompng('https://chart.googleapis.com/chart?cht=qr&chld=H|1&chs='.$size.'&chl='.urlencode($data));
if($logo !== FALSE){
$logo = imagecreatefromstring(file_get_contents($logo));

$QR_width = imagesx($QR);
$QR_height = imagesy($QR);

$logo_width = imagesx($logo);
$logo_height = imagesy($logo);

// Scale logo to fit in the QR Code
$logo_qr_width = $QR_width/3;
$scale = $logo_width/$logo_qr_width;
$logo_qr_height = $logo_height/$scale;

imagecopyresampled($QR, $logo, $QR_width/3, $QR_height/3, 0, 0, $logo_qr_width, $logo_qr_height, $logo_width, $logo_height);
}
imagepng($QR);
imagedestroy($QR);
?>