thinkphp 5.1 同时选中多个文件上传

<form id="ajaxform" enctype="multipart/form-data" class="form">
<input type="file" class="input-file" accept="image/gif, image/jpeg" id="uploadimg"  name="image[]" multiple />

<input type="button" id="postbtn" class="input-btn" value="上传" /> 
</form> 

<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
<!--
    $(function(){

        $("#postbtn").on("click",function(){
            var formData = new FormData($("#ajaxform")[0]);
            console.log(formData);
            $.ajax({
                type: "POST",
                data:formData,
                url:"imgupload",
                contentType:false,
                processData:false,
                success: function(data){
                    console.log(data);
                }});
            });
    });
//-->
</script>

//图片上传 ROOT_PATH.'uploads'
    public function imgupload(){

        $files = request()->file('image');
        foreach($files as $file){
            // 移动到框架应用根目录/public/uploads/ 目录下
            $info = $file->validate(['size'=>156780,'ext'=>'jpg,png,gif'])->move(ROOT_PATH . 'public' . DS . 'upload');
            if(!$info){
                // 上传失败获取错误信息
                echo $file->getError();
            }
        }
    }