


Several ways to generate QR codes in PHP and their usage examples_PHP tutorial
1.google开放api
$urlToEncode="http://bbs.lewanchina.com";
generateQRfromGoogle($urlToEncode);
function generateQRfromGoogle($chl,$widhtHeight ='150',$EC_level='L',$margin='0')
{
$url = urlencode($url);
echo '
}

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:
include "./phpqrcode/phpqrcode.php";
$value="http://www.weste.net";
$errorCorrectionLevel = "L";
$matrixPointSize = "4";
QRcode::png($value, false, $errorCorrectionLevel, $matrixPointSize);
exit;
?>
主页地址:http://phpqrcode.sourceforge.net/,站点里能直接下载源码,下载后解压到web目录,通过网页访问,就可以看到demo演示。

Data表示要记录的数据,如果是存储utf-8编码的中文,最多984个。
ECC表示纠错级别, 纠错级别越高,生成图片会越大。
L水平 7%的字码可被修正
M水平 15%的字码可被修正
Q水平 25%的字码可被修正
H水平 30%的字码可被修正Size表示图片每个黑点的像素。
代码的调用范例:
include "qrlib.php";
QRcode::png($data, $filename, $errorCorrectionLevel, $matrixPointSize, $margin);
/*
$data 数据
$filename 保存的图片名称
$errorCorrectionLevel 错误处理级别
$matrixPointSize 每个黑点的像素
$margin 图片外围的白色边框像素
*/
QR码详细原理可以参考QR维基百科,中文版介绍比较少,英文版介绍很全面,推荐看英文版的。
另外,现在QR码已经有彩色版的了,还可以嵌入个性图片,我在这方面做了些研究, 如果有兴趣,可以和我联系交流。我的联系邮箱参考网站右边栏目。
3.libqrencode
地址:http://fukuchi.org/works/qrencode/index.en.html
php支持请参考:http://hirokawa.netflowers.jp/entry/4900/
4.QRcode Perl CGI & PHP scripts
地址:http://www.swetake.com/qr/qr_cgi.html

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