yii2 multi-image upload component usage tutorial php example

use kartik\widgets\FileInput
// or 'use kartikile\FileInput' if you have only installed yii2-widget-fileinput in isolation
// 使用ActiveForm 和 model绑定的单张图片示例
echo $form->field($model, 'avatar')->widget(FileInput::classname(), [
  'options' => ['accept' => 'image/*'],
]);
// 多图上传示例
echo &#39;<label class="control-label">Add Attachments</label>&#39;;
echo FileInput::widget([
  &#39;model&#39; => $model,
  &#39;attribute&#39; => &#39;attachment_1[]&#39;,
  &#39;options&#39; => [&#39;multiple&#39; => true]
]);
// 不绑定model的使用方法
echo &#39;<label class="control-label">Upload Document</label>&#39;;
echo FileInput::widget([
  &#39;name&#39; => &#39;attachment_3&#39;,
]);
// 不可点击的示例
echo &#39;<label class="control-label">Select Attachment</label>&#39;;
echo FileInput::widget([
  &#39;name&#39; => &#39;attachment_4&#39;,
  &#39;disabled&#39; => true
]);

<?= $form->field($model, &#39;image[]&#39;)->label($label)->widget(FileInput::classname(), [
  // &#39;name&#39; => &#39;ImgSelect&#39;,
  &#39;language&#39; => &#39;zh-CN&#39;, 
  &#39;options&#39; => [&#39;multiple&#39; => true, &#39;accept&#39; => &#39;image/*&#39;], 
  &#39;pluginOptions&#39; => [ 
    &#39;initialPreview&#39; => $initialPreview, 
    &#39;initialPreviewConfig&#39; => $initialPreviewConfig, 
    &#39;allowedPreviewTypes&#39; => [&#39;image&#39;], 
    &#39;allowedFileExtensions&#39; => [&#39;jpg&#39;, &#39;gif&#39;, &#39;png&#39;], 
    &#39;previewFileType&#39; => &#39;image&#39;, 
    &#39;overwriteInitial&#39; => false, 
    &#39;browseLabel&#39; => &#39;选择图片&#39;,
    &#39;msgFilesTooMany&#39; => "选择上传的图片数量({n}) 超过允许的最大图片数{m}！", 
    &#39;maxFileCount&#39; => 5,//允许上传最多的图片5张 
    &#39;maxFileSize&#39; => 2048,//限制图片最大200kB 
    &#39;uploadUrl&#39; => Url::to([&#39;/upload/image&#39;]),
    //&#39;uploadExtraData&#39; => [&#39;testid&#39; => &#39;listimg&#39;], 
    &#39;uploadAsync&#39; => true,//配置异步上传还是同步上传 
  ],
  &#39;pluginEvents&#39; => [ 
    &#39;filepredelete&#39; => "function(event, key) { 
        return (!confirm(&#39;确认要删除&#39;)); 
      }", 
    &#39;fileuploaded&#39; => &#39;function(event, data, previewId, index) { 
        $(event.currentTarget.closest("form")).append(data.response.imgfile);
      }&#39;, 
    &#39;filedeleted&#39; => &#39;function(event, key) { 
        $(event.currentTarget.closest("form")).find("#"+key).remove(); 
        return;
      }&#39;, 
  ]
]); ?>

/** 
  * 上传图片到临时目录 
  * @return string 
  * @throws \yii\base\Exception 
  */ 
 public function actionImage() 
 { 
   if (Yii::$app->request->isPost) { 
     $res = []; 
     $initialPreview = []; 
     $initialPreviewConfig = []; 
     $images = UploadedFile::getInstancesByName("UploadImage[image]"); 
     if (count($images) > 0) { 
       foreach ($images as $key => $image) { 
         if ($image->size > 2048 * 1024) { 
           $res = ['error' => '图片最大不可超过2M']; 
           return json_encode($res); 
         } 
         if (!in_array(strtolower($image->extension), array('gif', 'jpg', 'jpeg', 'png'))) { 
           $res = ['error' => '请上传标准图片文件, 支持gif,jpg,png和jpeg.']; 
           return json_encode($res); 
         } 
         $dir = '/uploads/temp/'; 
         //生成唯一uuid用来保存到服务器上图片名称 
         $pickey = ToolExtend::genuuid(); 
         $filename = $pickey . '.' . $image->getExtension();
         //如果文件夹不存在，则新建文件夹 
         if (!file_exists(Yii::getAlias('@backend') . '/web' . $dir)) { 
           FileHelper::createDirectory(Yii::getAlias('@backend') . '/web' . $dir, 777); 
         } 
         $filepath = realpath(Yii::getAlias('@backend') . '/web' . $dir) . '/'; 
         $file = $filepath . $filename; 
         if ($image->saveAs($file)) { 
           $imgpath = $dir . $filename; 
           /*Image::thumbnail($file, 100, 100) 
             ->save($file . '_100x100.jpg', ['quality' => 80]); 
*/ 
          //  array_push($initialPreview, "<img src=&#39;" . $imgpath . "&#39; class=&#39;file-preview-image&#39; alt=&#39;" . $filename . "&#39; title=&#39;" . $filename . "&#39;>"); 
           $config = [ 
             &#39;caption&#39; => $filename, 
             &#39;width&#39; => &#39;120px&#39;, 
             &#39;url&#39; => &#39;../upload/delete&#39;, // server delete action 
             &#39;key&#39; => $pickey,
             &#39;extra&#39; => [&#39;filename&#39; => $filename] 
           ];
           array_push($initialPreviewConfig, $config); 
           $res = [ 
             "initialPreview" => $initialPreview, 
             "initialPreviewConfig" => $initialPreviewConfig, 
             "imgfile" => "<input name=&#39;image[]&#39; id=&#39;" . $pickey . "&#39; type=&#39;hidden&#39; value=&#39;" . $imgpath . "&#39;/>",
             &#39;filename&#39; => $filename,
             &#39;imagePath&#39; => $imgpath,
           ]; 
         }
       } 
     } 
     return json_encode($res); 
   } 
 }