Yii2学习笔记（八）：文件上传Upload

<?php
namespace app\models;
use yii\base\Model;
class Upload extends Model
{
public $file;

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

//文件上传功能
public function actionUpload()
{
$model = new Upload();

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]);
}

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

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

<?= $form->field($model, 'file')->fileInput() ?>
<button>Submit</button>

<?php ActiveForm::end() ?>