1. Go to this page and download the library: Download ctala/yii2-aws-s3 library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
// creating an object
$data = ['one', 'two', 'three'];
Yii::$app->get('s3bucket')->put('path/to/s3object.ext', Json::encode($data));
// uploading an object by streaming the contents of a stream
$resource = fopen('/path/to/local/file.ext', 'r+');
Yii::$app->get('s3bucket')->put('path/to/s3object.ext', $resource);