_</var> prefix, in the first parameter.  The prefix is added
automatically based on which database driver is currently being used.  This permits you to run the same function on different database platforms.
Obviously not all function calls are identical between platforms, so there are limits to how useful this function can be in terms of portability.</p>

<p>Any parameters needed by the function you are calling will be added to the second parameter.</p>

<code>$this->db->call_function('<var>some_function</v