ManaPHP\Text\Crossword::guess PHP Метод

    public function guess($words, $word)
    {
        if (is_string($words)) {
            $words = strpos($words, ',') !== false ? explode(',', $words) : [$words];
        }
        $word = strtolower($word);
        /** @noinspection ForeachSourceInspection */
        foreach ($words as $v) {
            if (strtolower($v) === $word) {
                return $v;
            }
        }
        /** @noinspection ForeachSourceInspection */
        foreach ($words as $k => $v) {
            if (strspn($word, strtolower($v)) !== strlen($word)) {
                unset($words[$k]);
            }
        }
        if (count($words) === 0) {
            return false;
        } elseif (count($words) === 1) {
            return array_values($words)[0];
        } else {
            return false;
        }
    }