图片上传问题 uniapp+php

chooseImage: async function() {
uni.chooseImage({
sourceType: sourceType[this.sourceTypeIndex],
// #ifdef MP-WEIXIN
sizeType: sizeType[this.sizeTypeIndex],
// #endif
count: this.imageLength - this.imageList.length,
success: (res) => {
console.log(res);
this.imageList = this.imageList.concat(res.tempFilePaths);
var file = [{
"name":"refund_pic",
"uri": res.tempFilePaths[0]
}]

                         uni.uploadFile({  
                            url: this.apiServer + '/Memberrefund/upload_pic', //仅为示例，非真实的接口地址  
                            filePath: res.tempFilePaths[0],  
                            // files:file,  
                            name: 'refund_pic1',  
                            fileType:'image',  
                            header: {  
                                    'content-type': 'multipart/form-data' //自定义请求头信息  
                            },  
                            formData: {  
                                'user': 'test'  
                            },  
                            success: (uploadFileRes) => {  
                                console.log('chenggong');  
                                console.log(uploadFileRes.data);  
                            },  
                            fail:(shibai)=>{  
                                console.log('shibai');  
                            }  
                        });  
                    }  
                })  

-------------------------------------------------------PHP--------------------------------------------------------

public function upload_pic() {

   var_dump(request()->file('refund_pic1'));die;  
    $refund_pic = array();  
    $refund_pic[1] = 'refund_pic1';  
    $refund_pic[2] = 'refund_pic2';  
    $refund_pic[3] = 'refund_pic3';  
    $pic_array = array();  
    $dir = BASE_UPLOAD_PATH.DS.ATTACH_PATH . DS . 'refund' . DS;  
    $count = 1;  
    foreach ($refund_pic as $pic) {  
        if (!empty($_FILES[$pic]['name'])) {  
            $upload=request()->file($pic);  
            $result = $upload->rule('uniqid')->validate(['ext' => ALLOW_IMG_EXT])->move($dir);  
            if ($result) {  
                $pic_array[$count] = $result->getFilename();  
            } else {  
                $pic_array[$count] = '';  
            }  
        }  
        $count++;  
    }  
    return $pic_array;  
}

request()->file() 接收不到数据。。。