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It's very easy to write your own functions for validation or sanitation. Check the example below.

The function must require one parameter ($data), and can optionally accept a second.

public function my_name ($data, $options)
{
   // do some validating here
   // or sanitizing. Depends on which library you're writing
   // the function for.
 
   // If you want to support options, add the $options to the second parameter
 
   // return TRUE on success and FALSE on failure
   // ... or return sanitized $data    
}

If you've written your own functions, why not share them with us here? :)