1、google開放api
$urlToEncode="
2、php類庫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/
下載：http://sourceforge.net/projects/phpqrcode/
實例：
<?
include "./phpqrcode/phpqrcode.php";
$value="http://fukuchi.org/works/qrencode/index.en.html
php支持請參考：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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