$info = explode("\n", $nfo);
$tags = array('games'   => array('text'     => 'Games',
                                 'genres'   => array('keywords' => array('genre', 'game type'),
                                                     'options'  => array('action', 'adventure', 'dance'),
                                                     ),
                                 ),
              'books'   => array('text'     => 'Books',
                                 'genres'   => array('keywords' => array('genre', 'book type'),
                                                     'options'  => array('suspense', 'romance', 'fiction'),
                                                     ),
                                 ),
              'music'   => array('text'     => 'Music',
                                 'genres'   => array('keywords' => array('genre', 'music type'),
                                                     'options'  => array('rap', 'country', 'blues', 'jazz'),
                                                     ),
                                 ),
              );

unset($tags);
foreach ($info as $index => $infoLine)
{
    foreach ($tags as $genre => $genreData)
    {
        $tags .= (($tags) ? ',' : '') . $genreData['text'];

        foreach ($genreData['genres'] as $index => $genreOptions)
        {
            $keywords = $genreOptions['keywords'];
            $options = $genreOptions['options'];

            foreach ($keywords as $index => $keyword)
            {
                if (strpos($infoLine, $keyword) === true)
                {
                    foreach ($options as $index => $option)
                    {
                        if (strpos($infoLine, $option) === true)
                        {
                            $tags .= (($tags) ? ',' : '') . ucwords($option);
                        }
                    }
                }
            }
        }
    }
}