php生成带logo 二维码图像的代码分享

<?php
/**
* 二维码图片 添加logo
* edit by bbs.it-home.org
*/
$data = 'http://bbs.it-home.org';
$size = '200x200';
$logo = './logo.jpg'; // 中间那logo图

// 通过google api生成未加logo前的QR图，也可以自己使用RQcode类生成
$png = 'http://chart.googleapis.com/chart?chs=' . $size . '&cht=qr&chl=' . urlencode($data) . '&chld=L|1&choe=UTF-8';

$QR = imagecreatefrompng($png);
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);
 
 $logo_qr_width = $QR_width / 5;
 $scale = $logo_width / $logo_qr_width;
 $logo_qr_height = $logo_height / $scale;
 $from_width = ($QR_width - $logo_qr_width) / 2;
 
 imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width, $logo_qr_height, $logo_width, $logo_height);
}
header('Content-type: image/png');
imagepng($QR);
imagedestroy($QR);
?>