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());
$qrCode->render();
具体方法说明：
setText($str)-----设置二维码的内容
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