php - Laravel3：如何检查是否有文件上传

Question

我有一个带有表单的页面，用户可以在其中上传图像以替换他现有的头像。

但是，如果用户提交表单而不上传图片，我不会更新他的头像，用户可以保留他的旧头像。

这是一个更新问题，所以我需要这样的伪代码：

if (Input::has_uploaded_file() === true)
    //User uploaded something, update avatar column/remove old avatar etc.
else
    //User didn't upload anything so don't update avatar column

不过，我只需要第一行。

有人可以帮忙吗？我在文档中找不到太多关于此的内容。

Answer 1

If Input::has_file('name') does not work for you then you can use the equivalent of what it is doing, like this...

if (Input::file('name.tmp_name', '') != '')

Taken from laravel/input.php

Answer 2

I read laravel source code, i think its this:

Input::has_file('input_name');

If that's not work, try using native php:

$_FILES['input_name']['error'] = UPLOAD_ERR_NO_FILE;

Or same above with laravel:

$i = Input::file('input_name');

$i['error'] = UPLOAD_ERR_NO_FILE;

Code above is to check if user leave the upload form empty.