PHP File Upload, files disappearing from /tmp before move_uploaded_files

Question

I have a very basic upload script, probably lifted straight off the php.net/move_upload_files function page.

move_uploaded_file() is failed because it canno

Answer 1

You are using the return value of move_uploaded_file() the wrong way round:

if(move_uploaded_file($_FILES['userfile']['tmp_name'], $upload_file))
{
    $result['error'] = 'true';
}
else
{
    $result['error'] = 'false';
    $result['file_loc'] = $upload_file;
}