How to upload files in yii2?

Yii2 UploadedFile implements file upload

To upload files in Yii, you usually use the yii\web\UploadedFile class, which Encapsulate each uploaded file into an UploadedFile object. Combining yii\widgets\ActiveForm and models, you can easily implement a secure file upload mechanism.

#1. Single file upload

First create a model models/UploadForm.php with the following content

namespace app\models;

use yii\base\Model;
use yii\web\UploadedFile;

/**
 * UploadForm is the model behind the upload form.
 */
class UploadForm extends Model
{
    /**
     * @var UploadedFile file attribute
     */
    public $file;

    /**
     * @return array the validation rules.
     */
    public function rules()
    {
        return [
            [['file'], 'file'],
        ];
    }
}

Create another view file with the following content

<?php
use yii\widgets\ActiveForm;
?>

<?php $form = ActiveForm::begin([&#39;options&#39; => [&#39;enctype&#39; => &#39;multipart/form-data&#39;]]) ?>

<?= $form->field($model, &#39;file&#39;)->fileInput() ?>

<button>Submit</button>

<?php ActiveForm::end() ?>

Finally create a controller file with the following content

namespace app\controllers;

use Yii;
use yii\web\Controller;
use app\models\UploadForm;
use yii\web\UploadedFile;

class SiteController extends Controller
{
    public function actionUpload()
    {
        $model = new UploadForm();

        if (Yii::$app->request->isPost) {
            $model->file = UploadedFile::getInstance($model, 'file');

            if ($model->file && $model->validate()) {                
                $model->file->saveAs('uploads/' . $model->file->baseName . '.' . $model->file->extension);
            }
        }

        return $this->render('upload', ['model' => $model]);
    }
}

Note that we do not use model->load(...) here, but use UploadedFile::getInstance(...). The difference is that the latter will not execute $model->validate(), so you need to manually execute $model->validate() to check the validity of the data. If the verification passes, the uploaded file is saved in the uploads folder, that is, uploads in the web directory.

Some optional configuration options
The uploaded file cannot be empty

public function rules(){
    return [
        [['file'], 'file', 'skipOnEmpty' => false],
    ];
}

The upload type can be checked not only based on the extension, but also based on the content of the file

public function rules(){
    return [
        [['file'], 'file', 'extensions' => 'jpg, png', 'mimeTypes' => 'image/jpeg, image/png',],
    ];
}

2. Multiple file upload

If you want to upload multiple files at one time, you only need to adjust a few parameters to achieve the goal

Model:

class UploadForm extends Model
{
    /**
     * @var UploadedFile|Null file attribute
     */
    public $file;

    /**
     * @return array the validation rules.
     */
    public function rules()
    {
        return [
            [[&#39;file&#39;], &#39;file&#39;, &#39;maxFiles&#39; => 10], // <--- here!
        ];
    }
}

View:

<?php
use yii\widgets\ActiveForm;

$form = ActiveForm::begin([&#39;options&#39; => [&#39;enctype&#39; => &#39;multipart/form-data&#39;]]);
?>

<?= $form->field($model, &#39;file[]&#39;)->fileInput([&#39;multiple&#39; => true]) ?>

    <button>Submit</button>

<?php ActiveForm::end(); ?>

The difference from single file upload is the following sentence

$form->field($model, 'file[]')->fileInput(['multiple' => true])

Controller:

namespace app\controllers;

use Yii;
use yii\web\Controller;
use app\models\UploadForm;
use yii\web\UploadedFile;

class SiteController extends Controller
{
    public function actionUpload()
    {
        $model = new UploadForm();

        if (Yii::$app->request->isPost) {
            $model->file = UploadedFile::getInstances($model, 'file');

            if ($model->file && $model->validate()) {
                foreach ($model->file as $file) {
                    $file->saveAs('uploads/' . $file->baseName . '.' . $file->extension);
                }
            }
        }

        return $this->render('upload', ['model' => $model]);
    }
}

This way, multiple files can be uploaded.

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