How to delete the file

File deletion is not part of a framework but a native php function. You are looking for the function unlink() (http://php.net/manual/en/function.unlink.php)

A small note, you cant delete a file based on the URL, the example you provide refers to a url (http://somedomain.com/uploads/images/somefile.jpg), you need to provide the (filebased) path to the file, for example:

PHP Code:

unlink(APPPATH . '/uploads/images/somefile.jpg');