php 文件上传异步同步

做php项目的附件上传,使用了jquery uploadify插件.
前台代码:

<form>
    <div id="queue"></div>
    <input id="file_upload" name="file_upload" type="file" multiple="true">
    ......
    <input type="submit" value="提交">
</form>

<script type="text/javascript">
    <?php $timestamp = time();?>
    $(function() {
        $('#file_upload').uploadify({
            'formData'     : {
                'timestamp' : '<?php echo $timestamp;?>',
                'token'     : '<?php echo md5('unique_salt' . $timestamp);?>'
            },
            'swf'      : '/oschina/Addons_Project/Addons/Public/Org/uploadify/uploadify.swf',
            'uploader' : 'http://localhost/oschina/Addons_Project/Addons/index.php/demo/index/uploads'
        });
    });
</script>

后台代码:

    public function index(){
        dump($_FILES);
        $this->display();
    }
    //附件文件上传
    public function uploads(){
        //date("Y/m/d")和date("Y-m-d")生成路径的不同,/直接被转换成了目录层级
        $targetFolder = '/oschina/Addons_Project/Addons/Public/Uploads/Files/'.date("Y/m/d"); // Relative to the root
        $verifyToken = md5('unique_salt' . $_POST['timestamp']);

        if (!empty($_FILES) && $_POST['token'] == $verifyToken) {
            $tempFile = $_FILES['Filedata']['tmp_name'];
            $targetPath = $_SERVER['DOCUMENT_ROOT'] . $targetFolder;
            // 如果没有文件夹则进行创建,默认代码中没有
            is_dir($targetPath)||mkdir($targetPath,0777,true);
            $targetFile = rtrim($targetPath,'/') . '/' . $_FILES['Filedata']['name'];

            // Validate the file type
            $fileTypes = array('jpg','jpeg','gif','png'); // File extensions
            $fileParts = pathinfo($_FILES['Filedata']['name']);

            if (in_array($fileParts['extension'],$fileTypes)) {
                move_uploaded_file($tempFile,$targetFile);
                echo '1';
            } else {
                echo 'Invalid file type.';
            }
        }
    }

文件上传没问题,我想在index方法中,将前台表单提交的数据(包括文件上传的表单)提交到数据库,但是我dump($_FILES);一直是empty.怎么样才能获取uploadify上传的文件信息,并保存到数据库中,包括路径信息.

慕仙森