CodeIgniter uploads files with duplicate file extensions

Any obvious reasons why CodeIgniter would duplicate th开发者_运维百科e file extension when using its Upload library? Tried all sort of ways to set the file name (with and without extension) and nothing seem to work. Any tips?

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I've encountered this same issue previously (unsure why, as it certainly doesn't occur in all my projects). The following fixed it for me (where $file_name is name of file):

$ext = end(explode('.',$file_name)); 
$config['file_name'] = basename($file_name,'.'.$ext);