引用自：https://github.com/endroid/qr-code
关键字：二维码自动生成 二维码源码 qr-code

通过endroid最新稳定版本构建状态总下载量每月下载许可证

这个库可以帮助你快速生成二维码。利用bacon/bacon qr码生成矩阵和khanamiryan/qrcode检测器解码器验证生成的qr码。进一步扩展了细枝扩展，生成路线，一个工厂和一个Symfony捆绑包，便于安装和配置。提供不同的编写器来生成PNG、SVG、EPS或二进制格式的QR码。

安装
使用Composer安装库进行安装。

安装Composer

curl -sS https://getcomposer.org/installer | php
#下载composer.phar
mv composer.phar /usr/local/bin/composer
#把composer.phar移动到环境下让其变成可执行
composer config -g repo.packagist composer https://packagist.phpcomposer.com
#换中国镜像
composer -V
# 输出：Composer version 1.8.4 2019-02-11 10:52:10

安装qrcode

$ composer require endroid/qr-code

基本语法

use Endroid\QrCode\QrCode;
$qrCode = new QrCode('Life is too short to be generating QR codes');
header('Content-Type: '.$qrCode->getContentType());
echo $qrCode->writeString();

高级语法

use Endroid\QrCode\ErrorCorrectionLevel;
use Endroid\QrCode\LabelAlignment;
use Endroid\QrCode\QrCode;
use Endroid\QrCode\Response\QrCodeResponse;

// Create a basic QR code
$qrCode = new QrCode('Life is too short to be generating QR codes');
$qrCode->setSize(300);
$qrCode->setMargin(10); 

// Set advanced options
$qrCode->setWriterByName('png');
$qrCode->setEncoding('UTF-8');
$qrCode->setErrorCorrectionLevel(ErrorCorrectionLevel::HIGH());
$qrCode->setForegroundColor(['r' => 0, 'g' => 0, 'b' => 0, 'a' => 0]);
$qrCode->setBackgroundColor(['r' => 255, 'g' => 255, 'b' => 255, 'a' => 0]);
$qrCode->setLabel('Scan the code', 16, __DIR__.'/../assets/fonts/noto_sans.otf', LabelAlignment::CENTER());
$qrCode->setLogoPath(__DIR__.'/../assets/images/symfony.png');
$qrCode->setLogoSize(150, 200);
$qrCode->setValidateResult(false);

// Round block sizes to improve readability and make the blocks sharper in pixel based outputs (like png).
// There are three approaches:
$qrCode->setRoundBlockSize(true, QrCode::ROUND_BLOCK_SIZE_MODE_MARGIN); // The size of the qr code is shrinked, if necessary, but the size of the final image remains unchanged due to additional margin being added (default)
$qrCode->setRoundBlockSize(true, QrCode::ROUND_BLOCK_SIZE_MODE_ENLARGE); // The size of the qr code and the final image is enlarged, if necessary
$qrCode->setRoundBlockSize(true, QrCode::ROUND_BLOCK_SIZE_MODE_SHRINK); // The size of the qr code and the final image is shrinked, if necessary

// Set additional writer options (SvgWriter example)
$qrCode->setWriterOptions(['exclude_xml_declaration' => true]);

// Directly output the QR code
header('Content-Type: '.$qrCode->getContentType());
echo $qrCode->writeString();

// Save it to a file
$qrCode->writeFile(__DIR__.'/qrcode.png');

// Generate a data URI to include image data inline (i.e. inside an <img> tag)
$dataUri = $qrCode->writeDataUri();

编码
您可以选择以下值之一进行编码：

ISO-8859-1, ISO-8859-2, ISO-8859-3, ISO-8859-4, ISO-8859-5, ISO-8859-6, ISO-8859-7, ISO-8859-8, ISO-8859-9, ISO-8859-10, ISO-8859-11, ISO-8859-12, ISO-8859-13, ISO-8859-14, ISO-8859-15, ISO-8859-16, Shift_JIS, windows-1250, windows-1251, windows-1252, windows-1256, UTF-16BE, UTF-8, US-ASCII, GBK EUC-KR

如果使用条形码扫描仪，则在读取生成的二维码时可能会遇到一些问题。根据您选择的编码，您将拥有与ECI块相对应的额外数据量。有些条形码扫描器没有被编程来解释这个信息块。例如，UTF-8的ECI块为000026，因此上述示例将生成：\000026寿命太短，无法生成二维码。为了确保最大的兼容性，您可以使用ISO-8859-1编码，这是条形码扫描仪使用的默认编码。

可读性

二维码的可读性主要由尺寸、输入长度、纠错级别和图像上任何可能的徽标决定，因此您可以调整这些参数。

使用教程可搜索：qr-code

PHP源码，转载自：https://blog.csdn.net/lqm417626953/article/details/103215874

新建Qrcodes.php二维码生成类

use Endroid\QrCode\ErrorCorrectionLevel;
use Endroid\QrCode\LabelAlignment;
use Endroid\QrCode\QrCode;
use Endroid\QrCode\Response\QrCodeResponse;
use think\Controller;
 
/**
 * 二维码生成类
 * Class Qrcodes
 * @package app\api\controller
 */
class Qrcodes extends Controller
{
    protected $param;
    public function __construct(Request $request = null)
    {
        parent::__construct($request);
        $this->param = [
            'setSize' => 300,//设置二维码尺寸
            'setWriterByName' => 'png',
            'setMargin' => 5,//设置二维码边界
            'setEncoding' => 'UTF-8',//设置编码
            'setErrorCorrectionLevel' => ErrorCorrectionLevel::HIGH(),//设置容错等级 等级越高识别度越高
            'setLabelStatus' => false,//是否开启二维码标题
            'setLabel' => '这是二维码标题',//设置二维码标题
            'setLogoPathStatus' => false,//是否开启二维码中间logo
            'setLogoPath' => 'logo.png',//设置二维码中间logo
            'setLogoSizeW' => 100,//设置二维码中间logo宽度
            'setLogoSizeH' => 100,//设置二维码中间logo高度
        ];
    }
 
    //生成二维码 --直接输出二维码
    public function returnQrcodeImg($content = '这是二维码内容',$param = [])
    {
        // Create a basic QR code创建一个基本的二维码
        $qrCode = new QrCode($content);
        //设置二维码尺寸
        $qrCode->setSize(isset($param['setSize']) ? $param['setSize'] : $this->param['setSize']);
        // Set advanced options设置高级选项
        $qrCode->setWriterByName(isset($param['setWriterByName']) ? $param['setWriterByName'] : $this->param['setWriterByName']);
        //设置二维码边界
        $qrCode->setMargin(isset($param['setMargin']) ? $param['setMargin'] : $this->param['setMargin']);
        //设置编码
        $qrCode->setEncoding(isset($param['setEncoding']) ? $param['setEncoding'] : $this->param['setEncoding']);
        //设置容错等级 等级越高识别度越高
        $qrCode->setErrorCorrectionLevel(isset($param['setErrorCorrectionLevel']) ? $param['setErrorCorrectionLevel'] : $this->param['setErrorCorrectionLevel']);
        //设置二维码颜色
        $qrCode->setForegroundColor(['r' => 0, 'g' => 0, 'b' => 0, 'a' => 0]);
        //设置二维码背景颜色
        $qrCode->setBackgroundColor(['r' => 255, 'g' => 255, 'b' => 255, 'a' => 0]);
        //设置二维码标题 在图片下方显示文字
        //$qrCode->setLabel('Scan the code', 16, __DIR__.'/../assets/fonts/noto_sans.otf', LabelAlignment::CENTER());
        if (isset($param['setLabelStatus']) ? $param['setLabelStatus'] : $this->param['setLabelStatus']) {
            $qrCode->setLabel(isset($param['setLabel']) ? $param['setLabel'] : $this->param['setLabel'], 16, null, LabelAlignment::CENTER());
        }
        //设置二维码中间logo
        if (isset($param['setLogoPathStatus']) ? $param['setLogoPathStatus'] : $this->param['setLogoPathStatus']) {
            $logo = isset($param['setLogoPath']) ? $param['setLogoPath'] : $this->param['setLogoPath'];
            $qrCode->setLogoPath(__DIR__.'/../../../public/static/images/'.$logo);
            //logo尺寸
            $setLogoSizeW = isset($param['setLogoSizeW']) ? $param['setLogoSizeW'] : $this->param['setLogoSizeW'];
            $setLogoSizeH = isset($param['setLogoSizeH']) ? $param['setLogoSizeH'] : $this->param['setLogoSizeH'];
            $qrCode->setLogoSize($setLogoSizeW, $setLogoSizeH);
        }
        //设置二维码内边距，true表示有内边距  false表示没有
        $qrCode->setRoundBlockSize(true);
        //启用内置的验证读取器(默认情况下禁用)
        $qrCode->setValidateResult(false);
        //排除xml声明
        $qrCode->setWriterOptions(['exclude_xml_declaration' => true]);
 
        // Directly output the QR code直接输出二维码
        header('Content-Type: '.$qrCode->getContentType());
        echo $qrCode->writeString();
 
        // Create a response object创建一个响应对象
        //$response = new QrCodeResponse($qrCode);
    }
 
    //生成二维码--保存图片并返回路径
    public function returnQrcodePath($content = '这是二维码内容',$filename = 'qrlogo.png',$param = [])
    {
        // Create a basic QR code创建一个基本的二维码
        $qrCode = new QrCode($content);
        //设置二维码尺寸
        $qrCode->setSize(isset($param['setSize']) ? $param['setSize'] : $this->param['setSize']);
        // Set advanced options设置高级选项
        $qrCode->setWriterByName(isset($param['setWriterByName']) ? $param['setWriterByName'] : $this->param['setWriterByName']);
        //设置二维码边界
        $qrCode->setMargin(isset($param['setMargin']) ? $param['setMargin'] : $this->param['setMargin']);
        //设置编码
        $qrCode->setEncoding(isset($param['setEncoding']) ? $param['setEncoding'] : $this->param['setEncoding']);
        //设置容错等级 等级越高识别度越高
        $qrCode->setErrorCorrectionLevel(isset($param['setErrorCorrectionLevel']) ? $param['setErrorCorrectionLevel'] : $this->param['setErrorCorrectionLevel']);
        //设置二维码颜色
        $qrCode->setForegroundColor(['r' => 0, 'g' => 0, 'b' => 0, 'a' => 0]);
        //设置二维码背景颜色
        $qrCode->setBackgroundColor(['r' => 255, 'g' => 255, 'b' => 255, 'a' => 0]);
        //设置二维码标题 在图片下方显示文字
        //$qrCode->setLabel('Scan the code', 16, __DIR__.'/../assets/fonts/noto_sans.otf', LabelAlignment::CENTER());
        if (isset($param['setLabelStatus']) ? $param['setLabelStatus'] : $this->param['setLabelStatus']) {
            $qrCode->setLabel(isset($param['setLabel']) ? $param['setLabel'] : $this->param['setLabel'], 16, null, LabelAlignment::CENTER());
        }
        //设置二维码中间logo
        if (isset($param['setLogoPathStatus']) ? $param['setLogoPathStatus'] : $this->param['setLogoPathStatus']) {
            $logo = isset($param['setLogoPath']) ? $param['setLogoPath'] : $this->param['setLogoPath'];
            $qrCode->setLogoPath(__DIR__.'/../../../public/static/images/'.$logo);
            //logo尺寸
            $setLogoSizeW = isset($param['setLogoSizeW']) ? $param['setLogoSizeW'] : $this->param['setLogoSizeW'];
            $setLogoSizeH = isset($param['setLogoSizeH']) ? $param['setLogoSizeH'] : $this->param['setLogoSizeH'];
            $qrCode->setLogoSize($setLogoSizeW, $setLogoSizeH);
        }
        //设置二维码内边距，true表示有内边距  false表示没有
        $qrCode->setRoundBlockSize(true);
        //启用内置的验证读取器(默认情况下禁用)
        $qrCode->setValidateResult(false);
        //排除xml声明
        $qrCode->setWriterOptions(['exclude_xml_declaration' => true]);
 
        // Directly output the QR code直接输出二维码
        //header('Content-Type: '.$qrCode->getContentType());
        //echo $qrCode->writeString();
 
        // Save it to a file保存到文件中
        $qrCode->writeFile(__DIR__.'/../../../public/qrcode/'.$filename);
        return $_SERVER['SERVER_ADDR'].'/public/qrcode/'.$filename;
        // Create a response object创建一个响应对象
        //$response = new QrCodeResponse($qrCode);
    }
}

HTML中调用

//直接输出二维码
    public function outputQrcodeImg()
    {
        $qrcode = new \app\common\controller\Qrcodes();
        $param = [
            'setLogoPathStatus' => true,
        ];
        //直接输出二维码
        $qrcode->returnQrcodeImg('https://www.baidu.com/',$param);
    }

    //返回二维码路径
    public function returnQrcodePath()
    {
        $qrcode = new \app\common\controller\Qrcodes();
        $param = [
            'setLogoPathStatus' => true,
        ];
        $filename = mt_rand(1,100000);
        //返回二维码路径
        $path = $qrcode->returnQrcodePath('https://www.baidu.com/',$filename.'.png',$param);
        return $path;

    }