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.

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.