yii2文件上传

首先我们创建model\Upload.php文件

<?php
namespace backend\models;
use Yii;
use yii\web\UploadedFile;
class Upload extends \yii\db\ActiveRecord
{
/**
* @var UploadedFile|Null file attribute
*/
public $file;
/**
* @return array the validation rules.
*/
public function rules()
{
return [
[["file"], "file",],
];
}
}

下面我们看看view层是怎么渲染的

<?php
use yii\widgets\ActiveForm;
$form = ActiveForm::begin(["options" => ["enctype" => "multipart/form-data"]]); ?>
<?= $form->field($model, "file")->fileInput() ?>
<button>Submit</button>
<?php ActiveForm::end(); ?>

最后实现controller层的实现

namespace backend\controllers;
use backend\models\Upload;
use yii\web\UploadedFile;
class ToolsController extends \yii\web\Controller
{
/**
* 文件上传
* 我们这里上传成功后把图片的地址进行返回
*/
public function actionTopic()
    {
       
        //实例化
        $model=new Topic();
        if ($request->isPost)
        {
            $post=$request->post();
            $image= UploadedFile::getInstance($model, 'image');
            //文件上传存放的目录
            $dir = "../web/image/".date("Ymd");
//            var_dump($dir);die;
            if (!is_dir($dir))
            {
                mkdir($dir);
            }else{
                //文件名
                $fileName = date("HiiHsHis").$image->baseName . "." .$image->extension;
                //保存路径
                $dir = $dir."/". $fileName;
                //保存文件
                $image->saveAs($dir);
            }
        }else{

            return $this->renderPartial('save_topic',['model'=>$model]);
        }
    }
}