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

Question

on a page, i have :
if (!empty($_FILES['logo']['name'])) {
$dossier = 'upload/';
$fichier = basename($_FILES['logo']['name']);
$taille_maxi = 100000;
$taille = filesize($_FILES['logo']['tmp_name']);
$extensions = array('.png', '.jpg', '.jpeg');
$extension = strrchr($_FILES['logo']['name'], '.');
if(!in_array($extension, $extensions)) {
$erreur = 'ERROR you must upload the right type';
}
if($taille>$taille_maxi) {
$erreur = 'too heavy';
}
if(!empty($erreur)) {
// ...
}
}
The problem is, if the users wants to edit information WITHOUT uploading a LOGO, it raises an error : 'error you must upload the right type'
So, if a user didn't put anything in the inputbox in order to upload it, i don't want to enter in these conditions test.
i tested :
if (!empty($_FILES['logo']['name']) and if (isset($_FILES['logo']['name'])
but both doesn't seems to work.
Any ideas?
edit : maybe i wasn't so clear, i don't want to test if he uploaded a logo, i want to test IF he selected a file to upload, because right now, if he doesn't select a file to upload, php raises an error telling he must upload with the right format.
thanks.

Answer 1

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 2

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 3

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

Answer 4

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 5

We Could Use
For Single file:
if ($_FILES['logo']['name'] == "") {
// No file was selected for upload, your (re)action goes here
}
For Multiple files:
if ($_FILES['logo']['tmp_name'][0] == "") {
// No files were selected for upload, your (re)action goes here
}

Answer 6

if($_FILES["uploadfile"]["name"]=="") {}
this can be used
No file was selected for upload, your (re)action goes here in if body
echo "no file selected";

Answer 7

if ($_FILES['logo']['error'] === 0)
is the only right way