id3_get_genre_id() returns the id for a genre. If the specified genre is not available in the genre list, id3_get_genre_id() will return FALSE
注: Instead of a filename you may also pass a valid stream resource.
In an ID3 tag, the genre is stored using a integer ranging from 0 to 147.
See also id3_get_genre_list() and id3_get_genre_name().