QR碼詳細原理可以參考QR維基百科，中文版介紹比較少，英文版介紹很全面，推薦看英文版的。
Description
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.
Features
•Supports QR Code versions (size) 1-40
•Numeric, Alphanumeric, 8-bit and Kanji encoding.
•Implemented purely in PHP, no external dependencies except GD2
•Exports to PNG, JPEG images, also exports as bit-table
•TCPDF 2-D barcode API integration
•Easy to configure
•Data cache for calculation speed-up
•Debug data dump, error logging, time benchmarking
•Provided merge tool helps deploy library as a one file
•new! API documentation
•new! Over 30 detailed examples
•100% Open Source, LGPL Licensed
Demo
項目地址：http://sourceforge.net/projects/phpqrcode/
Generate fixed size images
* phpqrcode本身未提供固定大小二維碼的設置，請參考 http://sourceforge.net/p/phpqrcode/discussion/1111884/thread/f739531a/
代碼如下--- original/phpqrcode/qrimage.php 2010-08-18 07:06:24.000000000 -0700
+++ qrimage.php 2012-07-13 00:51:57.000000000 -0700
@@ -86,10 +86,15 @@
}
}
- $target_image =ImageCreate($imgW * $pixelPerPoint, $imgH * $pixelPerPoint);
- ImageCopyResized($target_image, $base_image, 0, 0, 0, 0, $imgW * $pixelPerPoint, $imgH * $pixelPerPoint, $imgW, $imgH);
+
+ $targetW = (defined('IMAGE_WIDTH') ? IMAGE_WIDTH : $imgW * $pixelPerPoint );
+ $targetH = (defined('IMAGE_HEIGHT') ? IMAGE_HEIGHT : $imgH * $pixelPerPoint );
+
+ $target_image =ImageCreate($targetW, $targetH);
+
+ ImageCopyResized($target_image, $base_image, 0, 0, 0, 0, $targetW, $targetH, $imgW, $imgH);
ImageDestroy($base_image);
return $target_image;
}
- }
No newline at end of file
+ }
用法，設置生成的二維碼寬高為 500px
define('IMAGE_WIDTH', 500);
define('IMAGE_HEIGHT', 500);
QRcode::png('http://www.111cn.net/)');
