function hide_my_metabox( $post_type, $context, $post ) {
if ( ! in_category( array( 'category1', 'category2' ), $post ) ) {
remove_meta_box( 'css-block-taxonomydiv', 'post', 'side' );
}
}
add_action( 'do_meta_boxes', 'hide_my_metabox', 10, 3 );function add_class_to_list( $content ) {
if ( is_single( '1' ) ) { // 1 = ID записи
$content = str_replace( '<ul>', '<ul class="list2">', $content );
}
return $content;
}
add_filter( 'the_content', 'add_class_to_list' );