PHP upload script not working, empty variables - php

Question

I've tried to add image upload to an already working script that posts a subject and description. For some reason it's failing at the point where I'm using move_uploaded_file
The file name is successfully inserting into the database and the print_r statement is showing that the file is going into /tmp. I've tried to echo and print the $tempname and $folder but they seem to be blank and I don't know why. I'm guessing this is the problem.
My php.ini and httpd.conf and permissions are all good as another upload script written by someone else works fine.
if(isset($_POST['submit']))
{
$date = date('Y-m-d H:i:s');
$subject = $_POST['subject'];
$description = $_POST['description'];
$upload_dir = './image';
$filename = $_FILES["choosefile"]["name"];
$tempname = $_FILES["choosefile"]["temp_name"];
move_uploaded_file($tempname, "$upload_dir/$filename");
$insert = mysqli_query($db,"INSERT INTO xv.post (subject, description, creation_date, image) VALUES ('$subject', '$description', '$date', '$filename')");
if(!$insert)
{
echo mysqli_error();
}
else
{
print "<p>Here is some more debugging info:</p>";
print_r($_FILES);
echo $tempname . $folder;
}
}

Answer 1

It should be tmp_name instead of temp_name.
So changing to below should do the trick:
$upload_dir = './image';
$filename = $_FILES["choosefile"]["name"];
$tempname = $_FILES["choosefile"]["tmp_name"];
move_uploaded_file($tempname, "$upload_dir/$filename");
$insert = mysqli_query($db,"INSERT INTO xv.post (subject, description, creation_date, image) VALUES ('$subject', '$description', '$date', '$filename')");

Answer 2

please add a print_r to the $_FILES to see the content:
print_r($_FILES);
Provably there is another structure that you have to get.