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']);
    $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.

Oldskool · Accepted Answer · 2013-01-26T23:06:50.457

87

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.

edited Jan 26 '13 at 23:06

answered Jun 02 '10 at 14:27

Oldskool

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Jonas · Answer 2 · 2010-06-02T14:49:53.903

35

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.

edited Jun 02 '10 at 14:49

answered Jun 02 '10 at 13:39

Jonas

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@Tristan open your eyes and see: Value: 4; **No file was uploaded** – Your Common Sense Jun 02 '10 at 14:29
@Col. Shrapnel oooops, indeed, i'm sorry, maybe it's time i put my glasses ;p – sf_tristanb Jun 02 '10 at 14:31
1

I checked this out for myself. It is indeed the correct way to check for such a case. Also Note: "If no file is selected for upload in your form, PHP will return $_FILES['userfile']['size'] as 0, and $_FILES['userfile']['tmp_name'] as none." (From the PHP Documentation) http://php.net/manual/en/features.file-upload.post-method.php – Chris Bier Dec 29 '12 at 22:25

baloo · Answer 3 · 2010-06-02T13:43:57.603

14

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

edited Jun 02 '10 at 13:43

answered Jun 02 '10 at 13:37

baloo

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i added some information on my post. if you can look at it. thx – sf_tristanb Jun 02 '10 at 14:08

score 7 · Answer 4 · answered Jun 02 '10 at 13:37

7

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']))

answered Jun 02 '10 at 13:37

Jess

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i added some information on my post. if you can look at it. thx – sf_tristanb Jun 02 '10 at 14:07

score 2 · Answer 5 · edited Mar 21 '21 at 17:30

2

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
}

edited Mar 21 '21 at 17:30

Syscall

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answered Mar 21 '21 at 17:18

Divyanshu

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1

score 0 · Answer 6 · edited Feb 13 '23 at 08:43

0

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";

edited Feb 13 '23 at 08:43

Harsh Mangalam

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answered Feb 09 '23 at 17:27

Er. Harpavandip Singh

1

score -3 · Answer 7 · answered Jun 02 '10 at 13:39

-3

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

is the only right way

answered Jun 02 '10 at 13:39

Your Common Sense

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1

This is contrary to what the PHP Documentation states. This will actually evaluate to true if the file was uploaded successfully. http://php.net/manual/en/features.file-upload.errors.php – Chris Bier Dec 29 '12 at 22:27

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

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