php生成二维码可以有以下几种方式

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 '<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