//控制器層

 <?php

 namespace app\controllers;

 use app\models\Uploads;

 use Yii;

 use yii\web\Controller;

 use yii\web\UploadedFile;

 class UploadsController extends Controller

 {

     public function actionUpload()

     {

         //實例化數據表

         $model = new Uploads();

         $id = yii::$app->db->createCommand("select id from upload order by id desc limit 1")->queryOne();

         $cid = $id['id'];

         //判斷傳值方式是否為post提交方式

         if (Yii::$app->request->isPost) {

             $model->imageFiles = UploadedFile::getInstances($model, 'imageFiles');

             $model->imageFiles = $model->upload();

             $arr = $model->imageFiles;

             foreach ($arr as $key=>$val){

                 yii::$app->db->createCommand("insert into uploads (cid,imageFiles) values ('$cid','$val')")->execute();

             }

         }

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

     }

 }

 //模型層

 <?php

 namespace app\models;

 use yii\db\ActiveRecord;

 class Uploads extends ActiveRecord

 {

     //設定圖片上傳驗證規則  eg:上傳圖片格式&圖片個數等等

     public function rules()

     {

         return [

             [['imageFiles'], 'file', 'skipOnEmpty' => true, 'extensions' => 'png, jpg', 'maxFiles' => 8],

         ];

     }

     public function upload()

     {

         if ($this->validate()) {

             foreach ($this->imageFiles as $file) {

                 $file->saveAs('uploads/' . $file->baseName . '.' . $file->extension);

                 //實現文件上傳入庫路徑全名

                 $arr[] =  'http://www.wechat.com/uploads/' . $file->baseName . '.' . $file->extension;

             }

             return $arr;

         } else {

             return false;

         }

     }

 }

 <?php

 use yii\widgets\ActiveForm;

 ?>

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

 <?= $form->field($model, 'imageFiles[]')->fileInput(['multiple' => true, 'accept' => 'image/*']) ?>

     <button>Submit</button>

 <?php ActiveForm::end() ?>