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An example of Yii2 using forms to upload files

巴扎黑
巴扎黑Original
2017-08-15 13:15:321592browse

This article mainly introduces the example code of Yii2 using forms to upload files. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor and take a look.

yii2 It is often used to upload files through forms. How to upload them?

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, &#39;file&#39;);

      if ($model->file && $model->validate()) {        
        $model->file->saveAs(&#39;uploads/&#39; . $model->file->baseName . &#39;.&#39; . $model->file->extension);
      }
    }

    return $this->render(&#39;upload&#39;, [&#39;model&#39; => $model]);
  }
}

Note that we did not use model->load(...) here, but used 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 [
    [[&#39;file&#39;], &#39;file&#39;, &#39;skipOnEmpty&#39; => false],
  ];
}

The upload type can not only be based on the extension Check, you can also check based on the content of the file


public function rules()
{
  return [
    [[&#39;file&#39;], &#39;file&#39;, &#39;extensions&#39; => &#39;jpg, png&#39;, &#39;mimeTypes&#39; => &#39;image/jpeg, image/png&#39;,],
  ];
}

2. Multiple file upload

If 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, &#39;file[]&#39;)->fileInput([&#39;multiple&#39; => 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, &#39;file&#39;);

      if ($model->file && $model->validate()) {
        foreach ($model->file as $file) {
          $file->saveAs(&#39;uploads/&#39; . $file->baseName . &#39;.&#39; . $file->extension);
        }
      }
    }

    return $this->render(&#39;upload&#39;, [&#39;model&#39; => $model]);
  }
}

In this way, multiple files can be uploaded.

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