How to test if a user has SELECTED a file to upload?

Question

on a page, i have :

if (!empty($_FILES[\'logo\'][\'name\'])) {
    $dossier     = \'upload/\';
    $fichier     = basename($_FILES[\'logo\'][\'name\']);
            


        

Answer 1

There is a section in php documentation about file handling. You will find that you can check various errors and one of them is

UPLOAD_ERR_OK
    Value: 0; There is no error, the file uploaded with success.
<...>
UPLOAD_ERR_NO_FILE
    Value: 4; No file was uploaded.

In your case you need code like

if ($_FILES['logo']['error'] == UPLOAD_ERR_OK) { ... }

or

if ($_FILES['logo']['error'] != UPLOAD_ERR_NO_FILE) { ... }

You should consider checking (and probably providing appropriate response for a user) for other various errors as well.

Answer 2

You can check this with:

if (empty($_FILES['logo']['name'])) {
    // No file was selected for upload, your (re)action goes here
}

Or you can use a javascript construction that only enables the upload/submit button whenever the upload field has a value other then an empty string ("") to avoid submission of the form with no upload at all.

Answer 3

I would test if (file_exists($_FILES['logo']['tmp_name'])) and see if it works.

Or, more approperately (thanks Baloo): if (is_uploaded_file($_FILES['logo']['tmp_name']))

Answer 4

if ($_FILES['logo']['error'] === 0)

is the only right way

Answer 5

You should use is_uploaded_file($_FILES['logo']['tmp_name']) to make sure that the file was indeed uploaded through a POST.