composer require endroid/qrcode

<?php

/**

 * Created by PhpStorm.

 * User: cdjyj21

 * Date: 2018/9/4

 * Time: 11:57

 */

namespace app\services;

//引入刚刚添加的composer安装的类  里面的自动加载类

　　use think\facade\App;
　　require_once App::getRootPath().'/extend/vendor/autoload.php';

use Endroid\QrCode\ErrorCorrectionLevel;

use Endroid\QrCode\LabelAlignment;

use Endroid\QrCode\QrCode;

class QrcodeServer

{

    protected $_qr;

    protected $_encoding        = 'UTF-8';              // 编码类型

    protected $_size            = ;                  // 二维码大小

    protected $_logo            = false;                // 是否需要带logo的二维码

    protected $_logo_url        = '';                   // logo图片路径

    protected $_logo_size       = ;                   // logo大小

    protected $_title           = false;                // 是否需要二维码title

    protected $_title_content   = '';                   // title内容

    protected $_generate        = 'display';            // display-直接显示  writefile-写入文件

    protected $_file_name       = './static/qrcode';    // 写入文件路径

    const MARGIN           = ;                        // 二维码内容相对于整张图片的外边距

    const WRITE_NAME       = 'png';                     // 写入文件的后缀名

    const FOREGROUND_COLOR = ['r' => , 'g' => , 'b' => , 'a' => ];          // 前景色

    const BACKGROUND_COLOR = ['r' => , 'g' => , 'b' => , 'a' => ];    // 背景色

    public function __construct($config) {

        isset($config['generate'])      &&  $this->_generate        = $config['generate'];

        isset($config['encoding'])      &&  $this->_encoding        = $config['encoding'];

        isset($config['size'])          &&  $this->_size            = $config['size'];

        isset($config['logo'])          &&  $this->_logo            = $config['logo'];

        isset($config['logo_url'])      &&  $this->_logo_url        = $config['logo_url'];

        isset($config['logo_size'])     &&  $this->_logo_size       = $config['logo_size'];

        isset($config['title'])         &&  $this->_title           = $config['title'];

        isset($config['title_content']) &&  $this->_title_content   = $config['title_content'];

        isset($config['file_name'])     &&  $this->_file_name       = $config['file_name'];

    }

    /**

     * 生成二维码

     * @param $content //需要写入的内容

     * @return array | page input

     */

    public function createServer($content) {

        $this->_qr = new QrCode($content);

        $this->_qr->setSize($this->_size);

        $this->_qr->setWriterByName(self::WRITE_NAME);

        $this->_qr->setMargin(self::MARGIN);

        $this->_qr->setEncoding($this->_encoding);

        $this->_qr->setErrorCorrectionLevel(ErrorCorrectionLevel::HIGH);   // 容错率

        $this->_qr->setForegroundColor(self::FOREGROUND_COLOR);

        $this->_qr->setBackgroundColor(self::BACKGROUND_COLOR);

        // 是否需要title

        if ($this->_title) {

            $this->_qr->setLabel($this->_title_content, , null, LabelAlignment::CENTER);

        }

        // 是否需要logo

        if ($this->_logo) {

            $this->_qr->setLogoPath($this->_logo_url);

            $this->_qr->setLogoWidth($this->_logo_size);

        }

        $this->_qr->setValidateResult(false);

        if ($this->_generate == 'display') {

            // 展示二维码

            // 前端调用 例：<img src="http://localhost/qr.php?url=base64_url_string">

            header('Content-Type: ' . $this->_qr->getContentType());

            return $this->_qr->writeString();

        } else if ($this->_generate == 'writefile') {

            // 写入文件

            $file_name = $this->_file_name;

            return $this->generateImg($file_name);

        } else {

            return ['success' => false, 'message' => 'the generate type not found', 'data' => ''];

        }

    }

    /**

     * 生成文件

     * @param $file_name //目录文件 例: /tmp

     * @return array

     */

    public function generateImg($file_name) {

        $file_path = $file_name . DIRECTORY_SEPARATOR . uniqid() . '.' . self::WRITE_NAME;

        if (!file_exists($file_name)) {

            mkdir($file_name, , true);

        }

        try {

            $this->_qr->writeFile($file_path);

            $data = [

                'url' => $file_path,

                'ext' => self::WRITE_NAME,

            ];

            return ['success' => true, 'message' => 'write qrimg success', 'data' => $data];

        } catch (\Exception $e) {

            return ['success' => false, 'message' => $e->getMessage(), 'data' => ''];

        }

    }

}

<?php

/**

 * Created by PhpStorm.

 * User: cdjyj21

 * Date: 2018/9/4

 * Time: 11:57

 */

namespace app\test\controller;

use app\services\QrcodeServer;

class Qrcode

{

    /**

     * 直接输出二维码 + 生成二维码图片文件

     */

    public function create(){

        // 自定义二维码配置

        $config = [

            'title'         => true,

            'title_content' => 'test',

            'logo'          => true,

            'logo_url'      => './logo.png',

            'logo_size'     => ,

        ];

        // 直接输出

        $qr_url = 'http://www.baidu.com?id=' . rand(, );

        $qr_code = new QrcodeServer($config);

        $qr_img = $qr_code->createServer($qr_url);

        echo $qr_img;

        // 写入文件

        $qr_url = '这是个测试二维码';

        $file_name = './static/qrcode';  // 定义保存目录

        $config['file_name'] = $file_name;

        $config['generate']  = 'writefile';

        $qr_code = new QrcodeServer($config);

        $rs = $qr_code->createServer($qr_url);

        print_r($rs);

        exit;

    }

}

<img src="http://localhost:8080/projecttest/qrtest?id=1234"  alt="这是一个二维码" />

参考原文：https://www.jianshu.com/p/9b933907acd6