例子：
1.在表单中：
<?php $form = \yii\widgets\ActiveForm::begin([ ???????‘options‘=>[ ???????????‘class‘ => ‘form-horizontal‘, ???????????‘enctype‘ => ‘multipart/form-data‘ ???????], ???????‘fieldConfig‘ => [ ???????????‘template‘ => ‘{input}{error}‘, ???????????‘options‘ => [‘class‘ => ‘form-field‘], ???????], ???]); ?>注意：上传图片必须修改表单提交必须是以二进制数据流的形式；必须配置
‘enctype‘ => ‘multipart/form-data‘
<?= $form->field($model, ‘wms_check_certificate‘)->label("差异清单截图")->widget(\kartik\widgets\FileInput::className(), [ ???????????????‘options‘ => [ ???????????????????‘accept‘ => ‘image/jpg, image/jpeg, image/png, image/gif‘, ???????????????????‘multiple‘ => false, ???????????????], ???????????????‘pluginOptions‘ => [ ???????????????????‘previewFileType‘ => ‘image‘, ???????????????????‘initialPreview‘ => !empty($model->wms_check_certificate) ? $model->wms_check_certificate : "", ???????????????????‘initialPreviewConfig‘=>[], ???????????????????‘overwriteInitial‘=>true, ???????????????????‘initialPreviewAsData‘ => true, ???????????????????‘uploadUrl‘ => \yii\helpers\Url::toRoute([‘upload‘]), ???????????????????‘uploadExtraData‘ => [‘id‘=>$model->id], ???????????????????‘allowedFileExtensions‘ => [‘jpg‘, ‘png‘,‘gif‘, ‘jpeg‘], ???????????????????‘uploadAsync‘ => true, ???????????????????‘minFileCount‘ => 0, ???????????????????‘maxFileCount‘ => 1, ???????????????????‘showRemove‘ => true, ???????????????????‘showUpload‘ => true, ???????????????????‘showBrowse‘ => true, ???????????????????‘showPreview‘ => true, ???????????????????‘showCaption‘ => false, ???????????????????‘browseOnZoneClick‘ => true, ???????????????????‘fileActionSettings‘ => [ ???????????????????????‘showZoom‘ => true, ???????????????????????‘showUpload‘ => true, ???????????????????????‘showRemove‘ => true, ???????????????????], ???????????????], ???????????????‘pluginEvents‘ => [ ???????????????????"fileclear" => "function() { $(‘#wmscheck-wms_check_certificate‘).val(‘‘); }", ???????????????????"fileuploaded" => "function (event, data, id, index) { ???????????????????console.log(data); ?????????????????}", ???????????????], ???????????]) ?>注意：
‘accept‘ => ‘image/jpg, image/jpeg, image/png, image/gif‘, 指的是上传的文件的格式必须是jpg，png和gif
‘multiple‘ => false,指的是不支持上传多个文件
‘previewFileType‘ => ‘image‘,指的是上传的文件必须是图片
‘initialPreview‘ => !empty($model->wms_check_certificate) ? $model->wms_check_certificate : "",指的是刚进入页面时默认显示的文件
‘uploadUrl‘ => \yii\helpers\Url::toRoute([‘upload‘]),指的是上传文件的ur地址
‘uploadExtraData‘ => [‘id‘=>$model->id],指的是上传文件时附带的数据
‘allowedFileExtensions‘ => [‘jpg‘, ‘png‘,‘gif‘, ‘jpeg‘],指的是支持的文件后缀
‘uploadAsync‘ => true,指的是是否以异步形式上传
‘showUpload‘ => true,是否显示上传按钮
‘showBrowse‘ => true,是否显示打开文件对话框按钮
‘showRemove‘ => true,是否显示移除按钮
‘showCaption‘ => false,是否显示方法查看按钮
2.在后台处理上传：
public function actionUpload(){ ???????$id = $_REQUEST[‘id‘]; ???????if(!empty($_FILES[‘WmsCheck‘][‘tmp_name‘][‘wms_check_certificate‘])){ ???????????$wms_check_certificate = \common\models\Base::uploadCloud($_FILES[‘WmsCheck‘][‘tmp_name‘][‘wms_check_certificate‘], $_FILES[‘WmsCheck‘][‘name‘][‘wms_check_certificate‘], ‘wms‘); ???????????$model = \core\models\WmsCheck::findOne([‘id‘=>$id]); ???????????if (empty($model)){ ???????????????echo json_encode([‘msg‘=>false]); ???????????}else{ ???????????????$model->wms_check_certificate = $wms_check_certificate; ???????????????$save_handler = $model->save(false); ???????????????echo json_encode([‘msg‘=>$save_handler]); ???????????} ???????}else{ ???????????echo json_encode([‘msg‘=>false]); ???????} ???}Yii2上传图片插件使用
原文地址：https://www.cnblogs.com/liuzhiqaingxyz/p/9042744.html