morphos\Russian::checkLastConsonantSoftness PHP Method

    public function checkLastConsonantSoftness($word)
    {
        if (($substring = last_position_for_one_of_chars(lower($word), array_map(__NAMESPACE__ . '\\lower', self::$consonants))) !== false) {
            if (in_array(slice($substring, 0, 1), ['й', 'ч', 'щ'])) {
                // always soft consonants
                return true;
            } else {
                if (length($substring) > 1 && in_array(slice($substring, 1, 2), ['е', 'ё', 'и', 'ю', 'я', 'ь'])) {
                    // consonants are soft if they are trailed with these vowels
                    return true;
                }
            }
        }
        return false;
    }