麻烦帮忙图片无法上传是什么原因？

数据库能写入信息，但是图片没有上传到服务器上，不知道什么原因，麻烦大神帮忙看看
/**
* 店铺编辑
*/
public function store_editOp(){
/**
* 读取语言包
*/
$lang = Language::getLangContent();

$model_store = Model('store');
/**
* 保存
*/
if (chksubmit()){

/**
* 上传图片
*/
$upload = new UploadFile();
$upload->set('default_dir',ATTACH_COMMON);
/**
* 取店铺等级的审核
*/
$model_grade = Model('store_grade');
$grade_array = $model_grade->getOneGrade(intval($_POST['grade_id']));
if (empty($grade_array)){
showMessage($lang['please_input_store_level']);
}
/**
* 上传店铺广告图片
*/
if (!empty($_FILES['shopad']['name'])){
$upload = new UploadFile();
$upload->set('default_dir',ATTACH_COMMON);
$result = $upload->upfile('shopad');
}
/**
* 结束时间
*/
$time = '';
if(trim($_POST['end_time']) != ''){
$time = strtotime($_POST['end_time']);
}
$update_array = array();
$update_array['store_id'] = intval($_POST['store_id']);
$update_array['store_owner_card'] = trim($_POST['store_owner_card']);
$update_array['store_name'] = trim($_POST['store_name']);
$update_array['sc_id'] = intval($_POST['sc_id']);
$update_array['area_id'] = intval($_POST['area_id']);
$update_array['area_info'] = trim($_POST['area_info']);
$update_array['store_address'] = trim($_POST['store_address']);
$update_array['store_zip'] = trim($_POST['store_zip']);
$update_array['store_tel'] = trim($_POST['store_tel']);
$update_array['grade_id'] = intval($_POST['grade_id']);
$update_array['store_end_time'] = $time;
$update_array['store_state'] = intval($_POST['store_state']);
$store_info = $model_store->shopStore(array('store_name'=>$update_array['store_name']));
if($store_info['store_id'] > 0 && $store_info['store_id'] != $update_array['store_id']) {//检查店铺名称是否存在
showMessage($lang['store_name_exists']);
}
if ($_POST['store_state'] == '0'){
/**
* 根据店铺状态修改该店铺所有商品状态
*/
$model_goods = Model('goods');
$model_goods->updateGoodsStoreStateByStoreId($update_array['store_id'], 'close');
$update_array['store_close_info'] = trim($_POST['store_close_info']);
$update_array['store_recommend'] = 0;
}else {
/**
* 店铺开启后商品不在自动上架，需要手动操作
*/
$update_array['store_close_info'] = '';
$update_array['store_recommend'] = intval($_POST['store_recommend']);
}
$update_array['name_auth'] = intval($_POST['name_auth']);
$update_array['store_auth'] = intval($_POST['store_auth']);
$update_array['store_sort'] = intval($_POST['store_sort']);
if (!empty($_POST['shopad'])){
$update_array['shopad'] = $_POST['shopad'];
}
$result = $model_store->storeUpdate($update_array);

if ($result){

/**
* 判断有没有之前的图片，如果有则删除
*/
if (!empty($_POST['shopad']) && !empty($_POST['shopad'])){
@unlink(BasePath.DS.ATTACH_COMMON.DS.$_POST['shopad']);
}
//站内短信息通知
if ($_POST['store_state'] == 0){
//获取店铺信息
$store_info = $model_store->shopStore(array(
'store_id'=>$_POST['store_id']
));
//管理员关闭店铺
//向店主发送关闭通知消息
$msg_code = 'msg_toseller_store_closed_notify';
//内容
$param = array('reason'=>$_POST['store_close_info']);
self::send_notice($store_info['member_id'],$msg_code,$param);
}
$url = array(
array(
'url'=>'index.php?act=store&op=store',
'msg'=>$lang['back_store_list'],
),
array(
'url'=>'index.php?act=store&op=store_edit&store_id='.intval($_POST['store_id']),
'msg'=>$lang['countinue_add_store'],
),
);
showMessage($lang['update_store_ok'],$url);
}else {
showMessage($lang['update_fail_fail']);
}
}
/**
* 取店铺信息
*/
$condition['store_id'] = intval($_GET['store_id']);
$store_array = $model_store->shopStore($condition);
if (empty($store_array)){
showMessage($lang['store_no_exist']);
}
/**
* 整理店铺内容
*/
$store_array['store_end_time'] = $store_array['store_end_time']?date('Y-m-d',$store_array['store_end_time']):'';
/**
* 店铺分类
*/
$model_store_class = Model('store_class');
$parent_list = $model_store_class->getTreeClassList(2);
if (is_array($parent_list)){
foreach ($parent_list as $k => $v){
$parent_list[$k]['sc_name'] = str_repeat(" ",$v['deep']*2).$v['sc_name'];
}
}
/**
* 店铺等级
*/
$model_grade = Model('store_grade');
$grade_list = $model_grade->getGradeList();
Tpl::output('grade_list',$grade_list);
Tpl::output('class_list',$parent_list);
Tpl::output('store_array',$store_array);
Tpl::showpage('store.edit');
}

回复讨论(解决方案)

/**
* 上传店铺广告图片 */
if (!empty($_FILES['shopad']['name'])){
$upload = new UploadFile();
$upload->set('default_dir',ATTACH_COMMON);
$result = $upload->upfile('shopad');
}
/**
* 判断有没有之前的图片，如果有则删除 */
if (!empty($_POST['shopad']) && !empty($_POST['shopad'])){
@unlink(BasePath.DS.ATTACH_COMMON.DS.$_POST['shopad']);
}
你的判断删除图片在上传之后?那肯定会把之前上传的给删掉了阿

/**
* 上传店铺广告图片 */
if (!empty($_FILES['shopad']['name'])){
$upload = new UploadFile();
$upload->set('default_dir',ATTACH_COMMON);
$result = $upload->upfile('shopad');
}
/**
* 判断有没有之前的图片，如果有则删除 */
if (!empty($_POST['shopad']) && !empty($_POST['shopad'])){
@unlink(BasePath.DS.ATTACH_COMMON.DS.$_POST['shopad']);
}
你的判断删除图片在上传之后?那肯定会把之前上传的给删掉了阿

我已经把 * 判断有没有之前的图片，如果有则删除 */ 下面的代码删除了，还是不能上传，不知道什么原因！