YII installation QR code extension qrcode

For example, to add an extension that Https://github.com/2amigos/yii2-qrcode-helper generates a QR code
The first method:
1, open the root directory of the Composer.json, require there add "2amigos/yii2-qrcode-helper": "~1.0",
"Require": {

"PHP": ">=5.4.0",
"Yiisoft/yii2": "*",
"Yiisoft/yii2-bootstrap": "*",
"Yiisoft/yii2-swiftmailer": "*",
"2amigos/yii2-qrcode-helper": "~1.0 "

},

2, the command line switch to the root directory, run composer update, wait a few minutes just fine

3, according to the extension of the instructions to do some configuration
The second method:

php composer.phar require 2amigos/yii2-qrcode-helper:~1.0 
composer require 2amigos/yii2-qrcode-helper:~1.0 
在SiteController.php中 

 1  use   Dosamigos\qrcode\qrcode;  2   Dosamigos\qrcode\formats\mailto;  3   Public  function   Actionqrcode () { 5   $mailTo  = new  MailTo ([' Email ' = ' [email protected] '  6   $mailTo  );  7 } 

In the index.php

1    <  src= "<?= url::to ([' Site/qrcode '])?>"/>

Success

YII installation QR code extension qrcode