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/
实例：
<?
include "./phpqrcode/phpqrcode.php";
$value="http://www.weste.net";
$errorCorrectionLevel = "L";
$matrixPointSize = "4";
QRcode::png($value, false, $errorCorrectionLevel, $matrixPointSize);
exit;
?>
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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