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PHP生成条形码大揭秘_PHP

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May 29, 2016 am 11:48 AM

1.什么是条形码？

百度百科定义：条形码(barcode)是将宽度不等的多个黑条和空白，按照一定的编码规则排列，用以表达一组信息的图形标识符。常见的条形码是由反射率相差很大的黑条（简称条）和白条（简称空）排成平行线的图案。在日常生活中，条形码可以标出物品的生产国、制造厂家、商品名称、生产日期、图书分类号、邮件地点起止、类别、日期等许多信息。条形码编码格式具体请参考

打印出来的优惠券，商家需要用验证器读取条形码，来获得其有效性。

2.如何生成条形码？

首先找到强大的开源资料，在barcode官网下载barcodegen.1d-php5.v5.0.1.zip版本，然后解压文件放到你的Apache服务器的根目录下

2.1文件结构：

2.2具体解析

（1）class文件夹是已封装好生成条形码的类，只需要调用即可。

（2）index.php是一个可选择条件生成条形码的功能，是主程序的入口，而html文件夹是提供的被引用的代码，code39.php指的是指向默认的编码格式。

<&#63;php 
header('Location: html/code39.php'); 
&#63;>

（3）test.php是另外一个例子，通过代码直接生成HELLO条形码。　

View Code  
 
<&#63;php 
// 引用class文件夹对应的类 
require_once('class/BCGFontFile.php'); 
require_once('class/BCGColor.php'); 
require_once('class/BCGDrawing.php'); 
 
// 条形码的编码格式 
require_once('class/BCGcode39.barcode.php'); 
 
// 加载字体大小 
$font = new BCGFontFile('./class/font/Arial.ttf', 18); 
 
//颜色条形码 
$color_black = new BCGColor(0, 0, 0); 
$color_white = new BCGColor(255, 255, 255); 
 
$drawException = null; 
try { 
  $code = new BCGcode39(); 
  $code->setScale(2);  
  $code->setThickness(30); // 条形码的厚度 
  $code->setForegroundColor($color_black); // 条形码颜色 
  $code->setBackgroundColor($color_white); // 空白间隙颜色 
  $code->setFont($font); //  
  $code->parse('HELLO'); // 条形码需要的数据内容 
} catch(Exception $exception) { 
  $drawException = $exception; 
} 
 
//根据以上条件绘制条形码 
$drawing = new BCGDrawing('', $color_white); 
if($drawException) { 
  $drawing->drawException($drawException); 
} else { 
  $drawing->setBarcode($code); 
  $drawing->draw(); 
} 
 
// 生成PNG格式的图片 
header('Content-Type: image/png'); 
 
 
$drawing->finish(BCGDrawing::IMG_FORMAT_PNG); 
&#63;>

3.实际应用

对于上面有个大概的了解后，下面我们可以重新整合下代码，更加方便的使用它。

首先新建buildcode.php文件中，根据test.php文件进行改写，从请求的文件中获取数据：

1）.条形码的编码格式

2）.条形码需要的数据内容

View Code  
<&#63;php 
// Including all required classes 
require_once('class/BCGFontFile.php'); 
require_once('class/BCGColor.php'); 
require_once('class/BCGDrawing.php');  
$codebar = $_REQUEST['codebar']; //条形码将要数据的内容  
// Including the barcode technology 
require_once('class/'.$codebar.'.barcode.php');  
// Loading Font 
$font = new BCGFontFile('./class/font/Arial.ttf', 12);  
// The arguments are R, G, B for color. 
$color_black = new BCGColor(0, 0, 0); 
$color_white = new BCGColor(255, 255, 255);  
$drawException = null; 
try { 
  $code = new $codebar();//实例化对应的编码格式 
  $code->setScale(2); // Resolution 
  $code->setThickness(23); // Thickness 
  $code->setForegroundColor($color_black); // Color of bars 
  $code->setBackgroundColor($color_white); // Color of spaces 
  $code->setFont($font); // Font (or 0) 
  $text = $_REQUEST['text']; //条形码将要数据的内容 
  $code->parse($text); 
} catch(Exception $exception) { 
  $drawException = $exception; 
}  
/* Here is the list of the arguments 
 - Filename (empty : display on screen) 
 - Background color */ 
$drawing = new BCGDrawing('', $color_white); 
if($drawException) { 
  $drawing->drawException($drawException); 
} else { 
  $drawing->setBarcode($code); 
  $drawing->draw(); 
}  
// Header that says it is an image (remove it if you save the barcode to a file) 
header('Content-Type: image/png');  
// Draw (or save) the image into PNG format. 
$drawing->finish(BCGDrawing::IMG_FORMAT_PNG); 
&#63;>

然后新建test.html文件，向buildcode.php请求数据

<!DOCTYPE html> 
<html> 
<head> 
<title>Test with embedded image</title> 
</head> 
<body> 
 <img  src="/static/imghwm/default1.png"  data-src="buildcode.php&#63;codebar=BCGcode39&text=abc123"  class="lazy"/ alt="PHP生成条形码大揭秘_PHP" > 
</body> 
</html>

最后进行访问，浏览器直接生成png格式的条形码

其中codebar支持的编码格式可以由用户请求所得：

/*'BCGcodabar','BCGcode11','BCGcode39','BCGcode39extended','BCGcode93',　
'BCGcode128','BCGean8','BCGean13','BCGisbn','BCGi25','BCGs25','BCGmsi',　
'BCGupca','BCGupce','BCGupcext2','BCGupcext5','BCGpostnet','BCGothercode'*/　
剩下的就是验证了

4.验证

我们如何验证条形码是否有效，即能否读出条形码中的内容。

先将图片保存下来，然后访问官网提供的验证功能，将图片上传就Ok了！　

今天和大家一起揭秘了php如何生成条形码的，希望大家可以对条形码的形成有个大概的了解，对今后的学习有所帮助。

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