layui多文件上传与PHP后端对接的解决方案

<script src="js/layui/layui.js"></script>
    <link rel="stylesheet" href="js/layui/css/layui.css">

<div class="layui-upload">
    <button type="button" class="layui-btn layui-btn-normal" id="testList">选择多文件</button>
    <div class="layui-upload-list" style="max-width: 1000px;">
        <table class="layui-table">
            <colgroup>
                <col>
                <col width="150">
                <col width="260">
                <col width="150">
            </colgroup>
            <thead>
            <th>文件名</th>
            <th>大小</th>
            <th>上传进度</th>
            <th>操作</th>
            </thead>
            <tbody id="demoList"></tbody>
        </table>
    </div>
    <button type="button" class="layui-btn" id="testListAction">开始上传</button>
</div>

layui.use(['upload', 'element', 'layer'], function () {
        var $ = layui.jquery
                , upload = layui.upload
                , element = layui.element
                , layer = layui.layer;
        //演示多文件列表
        var uploadListIns = upload.render({
            elem: '#testList'
            , elemList: $('#demoList') //列表元素对象
            , url: 'http://test.com/get.php'
            , accept: 'file'
            , multiple: true
            , number: 10
            , auto: false
            , bindAction: '#testListAction'
            , choose: function (obj) {
                var that = this;
                var files = this.files = obj.pushFile(); //将每次选择的文件追加到文件队列
                //读取本地文件
                obj.preview(function (index, file, result) {
                    var tr = $(['<tr id="upload-' + index + '">'
                        , '<td>' + file.name + '</td>'
                        , '<td>' + (file.size / 1014).toFixed(1) + 'kb</td>'
                        , '<td><div class="layui-progress" lay-filter="progress-demo-' + index + '"><div class="layui-progress-bar" lay-percent=""></div></div></td>'
                        , '<td>'
                        , '<button class="layui-btn layui-btn-xs demo-reload layui-hide">重传</button>'
                        , '<button class="layui-btn layui-btn-xs layui-btn-danger demo-delete">删除</button>'
                        , '</td>'
                        , '</tr>'].join(''));
                    //单个重传
                    tr.find('.demo-reload').on('click', function () {
                        obj.upload(index, file);
                    });
                    //删除
                    tr.find('.demo-delete').on('click', function () {
                        delete files[index]; //删除对应的文件
                        tr.remove();
                        uploadListIns.config.elem.next()[0].value = ''; //清空 input file 值，以免删除后出现同名文件不可选
                    });
                    that.elemList.append(tr);
                    element.render('progress'); //渲染新加的进度条组件
                });
            }
            , done: function (res, index, upload) { //成功的回调
                var that = this;
                console.log(res);
                if (res.code == 0) { //上传成功
                    var tr = that.elemList.find('tr#upload-' + index), tds = tr.children();
                    tds.eq(3).html(''); //清空操作
                    delete this.files[index]; //删除文件队列已经上传成功的文件
                    return;
                }
                this.error(index, upload);
            }
            , allDone: function (obj) { //多文件上传完毕后的状态回调
                var json = JSON.stringify(obj);
                console.log(json);
            }
            , error: function (index, upload) { //错误回调
                var that = this;
                var tr = that.elemList.find('tr#upload-' + index)
                        , tds = tr.children();
                tds.eq(3).find('.demo-reload').removeClass('layui-hide'); //显示重传
            }
            , progress: function (n, elem, e, index) {
                element.progress('progress-demo-' + index, n + '%'); //执行进度条。n 即为返回的进度百分比
            }
        });
    });

<?php
$dir        = "uploadFile/";
//初始化返回数组
$arr = array(
  'code' => 0,
  'msg'  => '',
  'data' => array(
    'src' => $dir . $_FILES["file"]["name"]
  ),
);
$file_info  = $_FILES['file'];
$file_error = $file_info['error'];
$file = $dir . $_FILES["file"]["name"];
if (!file_exists($file)) {
  if ($file_error == 0) {
    if (move_uploaded_file($_FILES["file"]["tmp_name"], $dir . $_FILES["file"]["name"])) {
      $arr['msg'] = "上传成功";
    } else {
      $arr['msg'] = "上传失败";
    }
  } else {
    switch ($file_error) {
      case 1:
        $arr['msg'] = '上传文件超过了PHP配置文件中upload_max_filesize选项的值';
        break;
      case 2:
        $arr['msg'] = '超过了表单max_file_size限制的大小';
        break;
      case 3:
        $arr['msg'] = '文件部分被上传';
        break;
      case 4:
        $arr['msg'] = '没有选择上传文件';
        break;
      case 6:
        $arr['msg'] = '没有找到临时文件';
        break;
      case 7:
      case 8:
        $arr['msg'] = '系统错误';
        break;
    }
  }
} else {
  $arr['code'] = "1";
  $arr['msg']  = "当前目录中，文件" . $file . "已存在";
}
$res = json_encode($arr);
die($res);