check if file exists on a remote server

Dedix

i have something like it:

<?php

if (!isset($f)) {
$file = "http://www.domain.com/files/file.zip";
} else {
$file = $f;
}
if ($fp =@fopen($file, "r")) {
$msg = "<b>OK</b>";
} else {
$msg = "<b>ERROR</b>";
}
print $msg;

?>

It works fine, but if i call the script like this:

file.php?f=http://www.domain.com/files

it also returns true and print OK.

My question is how can i check for files ONLY?

Thanks in advance
Dedix

diego25

Do you have register_globals enabled? If you don't, then you have to use $_GET['f'] instead of $f.

Diego

Dedix

Yes, it's enabled, but i guess my problem is not about register globals...

Dedix

diego25

Well, for some web servers, if you just ask for a directory it will list the files in that directori. Therefore fopen may think that the page actually exists, which is why your programs outputs OK.

Diego

Dedix

Well, here is the plan:-)

I want a form users can post downloads (only remote files, they won't be hosted by my server) with that, so they just put the url with filename (!) in a text box and the script inserts it into a database.
But i don't want to let them to enter fake file urls, and/or non existing files.
So my question is how can i let the script to check if the whole (!) url with path, and filename (eg. http://www.fileserver.com/zip/file.zip) is valid?
I don't want my visitors to get 404 error when they clicks on a link on my site...

Any help would be appreciated!
Dedix