网址：

https://github.com/endroid/QrCode

安装命令：

$ composer require endroid/qrcode

参考实例代码：

<?php
  use Endroid\QrCode\QrCode;

  $qrCode = new QrCode();
  $qrCode->setText('Life is too short to be generating QR codes')
         ->setSize(300)
         ->setPadding(10)
         ->setErrorCorrection('high')
         ->setForegroundColor(array('r' => 0, 'g' => 0, 'b' => 0, 'a' => 0))
         ->setBackgroundColor(array('r'=>255,'g'=>255,'b'=>255,'a'=>0))
         ->setLabel('Scan the code')
         ->setLabelFontSize(16)
         ->setImageType(QrCode::IMAGE_TYPE_PNG);

   // now we can directly output the qrcode
   header('Content-Type: '.$qrCode->getContentType());
   $qrCode->render();

具体方法说明：

1. setText($str)-----设置二维码的内容

2. sdfdsf