Yii2.0 多文件上传

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首先你得调整模型类，在 file 验证规则里增加一个 maxFiles 选项，用以限制一次上传文件的最大数量。 

upload()方法也得修改, 以便一个一个地保存上传的文件。

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<?php
namespace appmodels;

use yiiaseModel;
use yiiwebUploadedFile;

class UploadForm1 extends Model{
    /**
     * @var UploadedFile[]
     */
    public $imageFiles;

    public function rules()
    {
        return [
            [['imageFiles'], 'file', 'skipOnEmpty' => false, 'extensions' => 'png, jpg', 'maxFiles' => 4],
        ];
    }    
    public function upload()
    {
        foreach ($this->imageFiles as $file) {
            $file->saveAs('./upload/' . $file->baseName . '.' . $file->extension);
        }
        return true;
    }
}

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在视图文件里，你需要把 multiple 选项添加到fileInput()函数调用里， 这样文件输入控件就可以接收多个文件。

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<?php
use yiiwidgetsActiveForm;
use yiihelpersUrl;
?>

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

<table class="table table-bordered table-hover definewidth m10">
<tr>
   <td class="tableleft">上传多个图片</td>
   <td><?= $form->field($model, 'imageFiles[]')->fileInput(['multiple' => true, 'accept' => 'image/*']) ?>

   </td>
</tr>

<tr>
   <td class="tableleft"></td>
   <td>
       <button type="submit" class="btn btn-primary" type="button">保存</button>
   </td>
</tr>

<?php ActiveForm::end() ?>

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最后，在控制器的 action 方法中，你应该调用 UploadedFile::getInstances() 而不是 UploadedFile::getInstance() 来把UploadedFile 实例数组赋值给 UploadForm::imageFiles。

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<?php
namespace backendcontrollers;

use Yii;
use yiiwebController;
use appmodelsUploadForm1;
use yiiwebUploadedFile;

class PhotoController extends Controller
{

    public $enableCsrfValidation = false;
    public function actionIndex()
    {
        $request = Yii::$app->request;
        $model = new UploadForm1();
        if($request->isPost)
        {
            $file=$model->imageFiles = UploadedFile::getInstances($model, 'imageFiles');
            //print_r($file);die;
            foreach ($file as $key => $v) {
                $image[]=$v->name;                
            }
            //print_r($image);die;  
            $images=implode(',',$image);
            if($model->upload())
            {
                $connection = Yii::$app->db;
                $connection->createCommand()->insert('upload', [
                    'image' => $images,
                ])->execute();
            }          
        }
        else
        {
            return $this->render('upload1',['model' => $model]);
        }
    }
}