Method transliterate

/**
 * Transliterate function
 *
 * This method processes a string and replaces all accented UTF-8 characters by unaccented
 * ASCII-7 "equivalents".
 *
 * @param   string  $string  The string to transliterate.
 *
 * @return  string  The transliteration of the string.
 *
 * @since   1.7.0
 */
public function transliterate($string)
{
    // First check for transliterator provided by translation
    if ($this->transliterator !== null) {
        $string = \call_user_func($this->transliterator, $string);
        // Check if all symbols were transliterated (contains only ASCII), otherwise continue
        if (!preg_match('/[\\x80-\\xff]/', $string)) {
            return $string;
        }
    }
    // Run our transliterator for common symbols,
    // This need to be executed before native php transliterator, because it may not have all required transliterators
    $string = Transliterate::utf8_latin_to_ascii($string);
    // Check if all symbols were transliterated (contains only ASCII),
    // Otherwise try to use native php function if available
    if (preg_match('/[\\x80-\\xff]/', $string) && function_exists('transliterator_transliterate') && function_exists('iconv')) {
        return iconv("UTF-8", "ASCII//TRANSLIT//IGNORE", transliterator_transliterate('Any-Latin; Latin-ASCII; Lower()', $string));
    }
    return StringHelper::strtolower($string);
}