(PECL id3 >= 0.1)
id3_get_genre_id — Get the id for a genre
$genre
   )id3_get_genre_id() returns the id for a genre.
genreGenre name as string.
   The genre id or FALSE on errors.
  
Example #1 id3_get_genre_id() example
<?php
$id = id3_get_genre_id("Alternative");
echo $id;
?>
The above example will output:
20