1.      require_once('./barcode/class/BCGColor.php');  
2.      require_once('./barcode/class/BCGDrawing.php');  
3.      require_once('./barcode/class/BCGcode128.barcode.php');  
4. $colorFront = new \BCGColor(0, 0, 0);  
5. $colorBack = new \BCGColor(255, 255, 255);  
6.   
7. // Barcode Part  
8. $font = new \BCGFontFile('./barcode/font/Arial.ttf', 14);  
9. $code = new \BCGcode128();  
10. $code->setScale(2);  
11. $code->setFont($font);  
12. $code->setColor($colorFront, $colorBack);  
13. $code->parse(I('code','error'));  
14.   
15. // Drawing Part  
16. $drawing = new \BCGDrawing('', $colorBack);  
17. $drawing->setBarcode($code);  
18. $drawing->draw();  
19.   
20. 'Content-Type: image/png');  
21.   
22. $drawing->finish(\BCGDrawing::IMG_FORMAT_PNG);

所需库下载地址：

​​https://www.barcodebakery.com/en/resources/api/php/databarexpanded  ​​