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您可以使用phpBarcode库来生成条形码，并设置尺寸和颜色。以下是一个示例代码：
// Include the library require_once('class/BCGFontFile.php'); require_once('class/BCGColor.php'); require_once('class/BCGDrawing.php'); // Including all required barcode classes require_once('class/BCGcodabar.barcode.php'); // The arguments are R, G, B for color. $colorFront = new BCGColor(0, 0, 0); $colorBack = new BCGColor(255, 255, 255); // Barcode Part $code = new BCGcodabar(); $code->setScale(2); // Resolution $code->setThickness(30); // Thickness $code->setForegroundColor($colorFront); // Color of bars $code->setBackgroundColor($colorBack); // Color of spaces $code->setFont(5); // Font (or 0) $code->parse('1234'); // Drawing Part $drawing = new BCGDrawing('', $colorBack); $drawing->setBarcode($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); 在上面的代码中，您可以通过设置setScale方法来设置条形码的大小，通过设置setForegroundColor和setBackgroundColor来设置条形码的前景色和背景色。您还可以通过设置setThickness方法来设置条形码的粗细。
