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How to produce and download php QR code

一个新手
Release: 2023-03-16 13:40:01
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<?php
 //引入phpqrcode库文件
define(&#39;IN_ECS&#39;, true);
 
require(dirname(__FILE__) . &#39;/includes/init.php&#39;);
include(&#39;includes/phpqrcode.php&#39;);
 
// 二维码数据
$data = &#39;http://www.baidu.com&#39;;
$filename = &#39;shopEwm/&#39;.&#39;baidu.png&#39;;
 
//down_file(&#39;baidu.png&#39;,BASE_PATH);
setShopEwm($data,$filename);
 
//生成二维码图片
function setShopEwm($data,$filename){
// 纠错级别:L、M、Q、H
 
    $errorCorrectionLevel = &#39;L&#39;;
    // 点的大小:1到10
    $matrixPointSize = 4;
    //创建一个二维码文件
    QRcode::png($data, $filename, $errorCorrectionLevel, $matrixPointSize, 2);
    //输入二维码到浏览器
    //QRcode::png($data);
}
//下载二维码图片
function down_file($file_name){
    $file_sub_dir = str_replace(&#39;\\&#39;,&#39;/&#39;,realpath(dirname(__FILE__).&#39;/&#39;))."/shopEwm/";
    //原因 php文件函数,比较古老,需要对中文转码 gb2312
    $file_name=iconv("utf-8","gb2312",$file_name);
 
    //绝对路径
    $file_path=$file_sub_dir.$file_name;
    //1.打开文件
    if(!file_exists($file_path)){
        echo "文件不存在!";
        return ;
    }
 
    $fp=fopen($file_path,"r");
    //2.处理文件
    //获取下载文件的大小
    $file_size=filesize($file_path);
 
    /* if($file_size>30){
 
    echo "<script language=&#39;javascript&#39;>window.alert(&#39;过大&#39;)</script>";
    return ;
    } */
 
    //返回的文件
    header("Content-type: application/octet-stream");
    //按照字节大小返回
    header("Accept-Ranges: bytes");
    //返回文件大小
    header("Accept-Length: $file_size");
    //这里客户端的弹出对话框,对应的文件名
    header("Content-Disposition: attachment; filename=".$file_name);
 
    //向客户端回送数据
 
    $buffer=1024;
    //为了下载的安全,我们最好做一个文件字节读取计数器
    $file_count=0;
    //这句话用于判断文件是否结束
    while(!feof($fp) && ($file_size-$file_count>0) ){
        $file_data=fread($fp,$buffer);
        //统计读了多少个字节
        $file_count+=$buffer;
        //把部分数据回送给浏览器;
        echo $file_data;
    }
 
    //关闭文件
    fclose($fp);
 
}
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