**Course Title:** Mastering Yii Framework: Building Scalable Web Applications **Section Title:** Working with File Uploads and Storage **Topic:** Create a file upload feature in a Yii application that stores files in a local or cloud storage system.(Lab topic) **Objective:** By the end of this topic, you will be able to create a file upload feature in a Yii application that stores files in a local or cloud storage system. You will learn how to handle file uploads, validate and store files securely, and implement file versioning and processing. **Prerequisites:** * Basic knowledge of Yii framework and its ecosystem * Understanding of file handling and storage concepts * Familiarity with cloud storage options (AWS S3, Google Cloud Storage) **Step 1: Setting up File Upload** To create a file upload feature in a Yii application, you need to set up the necessary configuration and dependencies. You can use the `yii2-upload` extension, which provides a simple and efficient way to handle file uploads. * Install the `yii2-upload` extension using Composer: `composer require --prefer-dist yiisoft/yii2-upload` * Configure the file upload settings in the `config/web.php` file: ```php 'components' => [ 'upload' => [ 'class' => 'yii\upload\Upload', 'tempPath' => '@runtime/uploads/temp', 'uploadPath' => '@runtime/uploads', 'allowedExtensions' => ['jpg', 'png', 'gif'], 'maxSize' => 1024 * 1024 * 5, // 5MB ], ], ``` **Step 2: Creating a File Upload Form** Create a file upload form in your view file (e.g., `views/file-upload.php`): ```php use yii\helpers\Html; use yii\widgets\ActiveForm; <?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]); ?> <?= $form->field($model, 'file')->fileInput() ?> <?= Html::submitButton('Upload File', ['class' => 'btn btn-primary']) ?> <?php ActiveForm::end(); ?> ``` **Step 3: Handling File Upload** Create a controller action to handle the file upload: ```php use yii\web\Controller; use yii\web\UploadedFile; class FileUploadController extends Controller { public function actionUpload() { $model = new FileUploadModel(); if ($model->load(Yii::$app->request->post()) && $model->save()) { // File uploaded successfully return $this->redirect(['view', 'id' => $model->id]); } else { // File upload failed return $this->render('file-upload', ['model' => $model]); } } } ``` **Step 4: Storing Files in Local Storage** To store files in a local storage system, such as a directory on your server. You can use the `yii\upload\Upload` component to handle file uploads and store them in a local directory: ```php 'components' => [ 'upload' => [ 'class' => 'yii\upload\Upload', 'tempPath' => '@runtime/uploads/temp', 'uploadPath' => '@runtime/uploads', 'allowedExtensions' => ['jpg', 'png', 'gif'], 'maxSize' => 1024 * 1024 * 5, // 5MB ], ], ``` **Step 5: Storing Files in Cloud Storage** To store files in a cloud storage system, such as AWS S3 or Google Cloud Storage, you need to use a cloud storage library, such as `aws/aws-sdk-php` or `google/cloud-storage`. You can then use the library to upload files to your cloud storage account: ```php use Aws\S3\S3Client; $s3 = new S3Client([ 'version' => 'latest', 'region' => 'us-west-2', 'credentials' => [ 'key' => 'YOUR_ACCESS_KEY', 'secret' => 'YOUR_SECRET_KEY', ], ]); $file = new UploadedFile(); $file->saveToS3($s3, 'your-bucket-name'); ``` **Conclusion:** In this topic, you learned how to create a file upload feature in a Yii application that stores files in a local or cloud storage system. You learned how to handle file uploads, validate and store files securely, and implement file versioning and processing. You can now use this knowledge to create a file upload feature in your own Yii application. **Additional Resources:** * Yii2 Upload Extension: <https://github.com/yiisoft/yii2-upload> * AWS SDK for PHP: <https://github.com/aws/aws-sdk-php> * Google Cloud Storage Client Library: <https://github.com/google/cloud-storage> **Leave a comment or ask for help if you have any questions or need further assistance.**