1、Google开放api

$urlToEncode=”http://bbs.phpchina.com“;
generateQRfromGoogle($urlToEncode);
function generateQRfromGoogle($chl,$widhtHeight =’150′,$EC_level=’L’,$margin=’0′)
{
 $url = urlencode($url);
 echo ‘<img src=”http://chart.apis.google.com/chart?chs=’.$widhtHeight.’x’.$widhtHeight.’&cht=qr&chld=’.$EC_level.’|’.$margin.’&chl=’.$chl.’” alt=”QR code” widhtHeight=”‘.$size.'” widhtHeight=”‘.$size.'”/>’;
}

 

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/

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