php file upload script

[kender]

i have a script for my users to upload files to my server...

the upload directory is chmod to 777 and files upload properly.

the only trouble is that I am having trouble getting it to verify if a filename is in use or not, it just overwrites the file regardless, can someone take a look and tell me what i'm missing?

here is the code

$file_dir = "./files";

foreach($_FILES as $file_name => $file_array)
{
	echo "Creating temporary file..... ".$file_array['tmp_name']."
\n";
	echo "Checking file name: ".$file_array['name']."
\n";
	echo "File type: ".$file_array['type']."
\n";
	echo "File size: ".$file_array['size']."

\n";

	if (is_uploaded_file($file_array['tmp_name']))
	{
		move_uploaded_file($file_array['tmp_name'], "$file_dir/$file_array[name]")
		or die ("Couldn't copy, file name already in use.");
		echo "File was moved successfully.
";
	}
}

this is based off of sams teach yourself php books script
all works except the verifying a filename

[kender]

Never mind, added this bit of code, and got it working fine!

thanks for looking though

if (file_exists("$file_dir/$file_array[name]")) 
{
   echo "Couldn't copy.
File name (<font color=navy>".$file_array['name']."</font>) already in use.
Please rename file and attempt upload again.";
} 
	else 
	{