利用phpqrcode生成二维码实例代码

--- 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，设置生成的二维码宽高为 500px

define('IMAGE_WIDTH', 500);
define('IMAGE_HEIGHT', 500);
QRcode::png('http://www.111cn.net/)');