Automatically categorize and tag posts when saved

Adding this snippet to the functions.php of your wordpress theme will let you automatically categorize and tag posts when you save them. Don't forget to add a new tag or a new category

( example screenshot )


add_action( 'wp_insert_post', 'update_post_terms' );

function update_post_terms( $post_id ) {
    if ( $parent = wp_is_post_revision( $post_id ) )
        $post_id = $parent;
    $post = get_post( $post_id );
    if ( $post->post_type != 'post' )

    // add a tag
    wp_set_post_terms( $post_id, 'new tag', 'post_tag', true );

    // add a category
    $categories = wp_get_post_categories( $post_id );
    $newcat    = get_term_by( 'name', 'Some Category', 'category' );

    array_push( $categories, $newcat->term_id );
    wp_set_post_categories( $post_id, $categories );

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