Ultimate Member - Display name, first and last name cases

Ultimate Member - Display name, first and last name cases

// Requires Ultimate Member v 1.3.69 above.

add_filter("um_user_first_name_case","um_custom_name_case");
add_filter("um_user_last_name_case","um_custom_name_case");
function um_custom_name_case( $string )
    {

        $word_splitters = array(' ', '-', "O'", "L'", "D'", 'St.', 'Mc', 'Mac');
        $lowercase_exceptions = array('the', 'van', 'den', 'von', 'und', 'der', 'de', 'di', 'da', 'of', 'and', "l'", "d'");
        $uppercase_exceptions = array('III', 'IV', 'VI', 'VII', 'VIII', 'IX');

        $string = strtolower($string);
        foreach ($word_splitters as $delimiter) {
            $words = explode($delimiter, $string);
            $newwords = array();
            foreach ($words as $word) {
                if (in_array(strtoupper($word), $uppercase_exceptions))
                    $word = strtoupper($word);
                else
                    if (!in_array($word, $lowercase_exceptions))
                        $word = ucfirst($word);

                $newwords[] = $word;
            }

            if (in_array(strtolower($delimiter), $lowercase_exceptions))
                $delimiter = strtolower($delimiter);

            $string = join($delimiter, $newwords);
        }
        return $string;
    }