comment cat c3 a9goriser et tagger automatiquement les messages dans wordpress

1<?php
2add_action( 'wp_insert_post', 'update_post_terms' );
3function update_post_terms( $post_id ) {
4    if ( $parent = wp_is_post_revision( $post_id ) )
5        $post_id = $parent;
6    $post = get_post( $post_id );
7    if ( $post->post_type != 'post' )
8        return;
9    // add a tag
10    wp_set_post_terms( $post_id, 'new tag', 'post_tag', true );
11    // add a category
12    $categories = wp_get_post_categories( $post_id );
13    $newcat = get_term_by( 'name', 'Some Category', 'category' ); 
14    array_push( $categories, $newcat->term_id );
15    wp_set_post_categories( $post_id, $categories );
16}
17?>