function uploadRear() {
		$.ajaxFileUpload({
			url:'{url:/ucenter/ajax_addr_identity_upload}',secureuri:false,fileElementId: 'strPhotoRear1',dataType: 'json',success: function (data) {
				if(data.error == '200'){
					$("#img-r").attr('src','{url:/' + data.data + '}');
					$('input[name="card_id_reverse"]').val(data.data);
					$('#strPhotoRear1').val();
				} else {
					art.dialog({
						content: data.data
					});
				}
			}
		});
	}

##php后台代码 利用了一个IUpload的类，foreach $_FILES，检查扩展名和图片木马，然后再上传。 先要了解PHP预定义变量$_FILES的格式：

Array
(
    [file1] => Array
        (
            [name] => MyFile.txt (comes from the browser,so treat as tainted)
            [type] => text/plain  (not sure where it gets this from)
            [tmp_name] => /tmp/php/php1h4j1o
            [error] => UPLOAD_ERR_OK  (= 0)
            [size] => 123   (the size in bytes)
        )

    [file2] => Array
        (
            [name] => MyFile.jpg
            [type] => image/jpeg
            [tmp_name] => /tmp/php/php6hst32
            [error] => UPLOAD_ERR_OK
            [size] => 98174
        )
)

这是在input name为file1和file2的情况，如果是写为file[img1],file[img2]，则处理为了以下模式（官方文档推荐了diverse_array(）的trick）：

Array
(
    [file] => Array
        (
            [name] => Array
                (
                    [img1] => MyFile.txt
                    [img2] => MyFile.jpg
                )
        ...

controller中的代码，返回处理后的消息给前台：

public function ajax_addr_identity_upload(){
        $file_dir = 'upload/addr_identity/';
        $uploader = new IUpload('5120'); //5M
        $sub_dir = date('Y') . '/' . date('m') . '/'. date('d');
        $uploader->setDir(trim($file_dir,'/') . '/' . $sub_dir);
        $res = $uploader->execute();
        //判断文件上传并生成数据
        if ((isset($res['picfront']) && $res['picfront'][0]['flag'] == 1) || (isset($res['picback']) && $res['picback'][0]['flag'] == 1)) {
            $return['error'] = '200';
            $return['data'] = empty($res['picfront'][0]['fileSrc']) ? $res['picback'][0]['fileSrc'] : $res['picfront'][0]['fileSrc'];
            $size = filesize($result['data']) / 1024;
            $code = new Config('code_config');
            $max_size = $code->card_id_max_size;
            if($size > $max_size){
                $proportion = number_format(($max_size/$size)*100);
                $this->createThumb($return['data'],$proportion);
            }
        }
        else
        {
            $return['error'] = '301';
            $return['data'] = '上传失败';
        }
        echo json_encode($return);exit();
    }

IUpload类中比较关键的方法

public function setDir($path,$chmod=0777){
    $dir = is_dir($path) or (self::mkdir(dirname($path),$chmod) and mkdir($path,$chmod));
    $dir = strtr($dir,'\\','/');
    $this->dir = substr($dir,-1)=='/' ? $dir : $dir.'/';
}
public function execute(){
    //总的文件上传信息
    $info = array();
    foreach($_FILES as $fid => $file) {
            $fileInfo = array();
             //不存在上传的文件名
            if(!isset($_FILES[$fid]['name']) || $_FILES[$fid]['name'] == '')
            {
            	continue;
            }
            //上传控件为数组格式 file[]格式
            if(is_array($_FILES[$fid]['name'])){
                 $keys = array_keys($_FILES[$fid]['name']);
                 foreach($keys as $key) {
                    //调用成员检查上传类型，pathinfo(）获取
                    $fileInfoArray = pathinfo($_FILES[$fid]['name'][$key]);
                     #code 检查上传大小 $_FILES[$field]['size'][$key] 
                     #code 图片木马检测
                     #开始上传 is_uploaded_file/mkdir/move_upload_file(tmp_name,dir+name)
                 }
           } else{
                //非文件数组上传方式
                #$fileInfo[0]['name'] = $_FILES[$field]['name'];
           }
            $info[$fid] = $fileInfo;   
    }