php生成二维码 （类库PHP QR Code）

http://blog.youkuaiyun.com/small_rice_/article/details/22922455

2.php类库PHP QR Code

PHP QR Code is open source (LGPL) library for generating QR Code, 

2-dimensional barcode. Based on libqrencode C library, 

provides API for creating QR Code barcode images (PNG, JPEG thanks to GD2).

Implemented purely in PHP, with no external dependencies (except GD2 if needed).

地址：http://phpqrcode.sourceforge.net/

下载：http://sourceforge.net/projects/phpqrcode/

实例：

自己写的如下：

<?
include "./phpqrcode/phpqrcode.php";
$value="http://www.baidu.com";
$errorCorrectionLevel = "L";
$matrixPointSize = "6";
QRcode::png($value, false, $errorCorrectionLevel, $matrixPointSize);
exit;
?>