php生成条形码 源码解释

<?php
// Including all required classes
require_once(‘class/BCGFontFile.php‘); //引入字体生成文件
require_once(‘class/BCGColor.php‘);//引入背景颜色文件
require_once(‘class/BCGDrawing.php‘);//引入图片生成文件

// Including the barcode technology
require_once(‘class/BCGcode39.barcode.php‘);//引入条形码编码规则文件

// Loading Font
$font = new BCGFontFile(‘./font/Arial.ttf‘, 18);//引入字体，并设置字号

// Don‘t forget to sanitize user inputs
$text = isset($_GET[‘text‘]) ? $_GET[‘text‘] : ‘dsfdfasda‘; //设置条形码的原文本的内容

// The arguments are R, G, B for color.
$color_black = new BCGColor(0, 0, 0); //设置黑色的rgb 颜色
$color_white = new BCGColor(255, 255, 255);//设置白色的rgb颜色

$drawException = null;
try {
    $code = new BCGcode39(); //创建一个新的对象
    $code->setScale(1.4); // Resolution //设置缩放的比例
    $code->setThickness(60); // Thickness  //设置高度
    $code->setForegroundColor($color_black); // Color of bars 
    $code->setBackgroundColor($color_white); // Color of spaces
    $code->setFont($font); // Font (or 0) //设置字体
    $code->parse($text); // Text //转换字体
} catch(Exception $exception) {
    $drawException = $exception;
}
/* Here is the list of the arguments
1 - Filename (empty : display on screen)
2 - Background color */

$drawing = new BCGDrawing(‘‘, $color_white);//创建一块画布
if($drawException) {
    $drawing->drawException($drawException); //假如捕获到错误就输出
} else {
    $drawing->setBarcode($code); //设置条形码
    $drawing->draw();//生成图片
}

// Header that says it is an image (remove it if you save the barcode to a file)
header(‘Content-Type: image/png‘); //告诉浏览器这是一张png格式的图片
header(‘Content-Disposition: inline; filename="barcode.png"‘); //配置，在行内,设置文件名称

// Draw (or save) the image into PNG format.
$drawing->finish(BCGDrawing::IMG_FORMAT_PNG);  //输出图像是png格式
?>