function create_post_type wp

function create_post_type() {
    register_post_type( 'product',
        array(
            'labels' => array(
                'name' => __( 'Products' ),
                'singular_name' => __( 'Product' )
            ),
        'public' => true,
        'has_archive' => true,
        'exclude_from_search' => true,
        'show_ui' => true,
        'supports' => array('title', 'editor', 'thumbnail', 'custom-fields'),
        )
    );
}
add_action( 'init', 'create_post_type' );

function my_taxonomies_product() {
    $labels = array(
        'name'              => _x( 'Product Categories', 'taxonomy general name' ),
        'singular_name'     => _x( 'Product Category', 'taxonomy singular name' ),
        'search_items'      => __( 'Search Product Categories' ),
        'all_items'         => __( 'All Product Categories' ),
        'parent_item'       => __( 'Parent Product Category' ),
        'parent_item_colon' => __( 'Parent Product Category:' ),
        'edit_item'         => __( 'Edit Product Category' ), 
        'update_item'       => __( 'Update Product Category' ),
        'add_new_item'      => __( 'Add New Product Category' ),
        'new_item_name'     => __( 'New Product Category' ),
        'menu_name'         => __( 'Product Categories' ),
    );
    $rewrite = array(
        'slug' => 'type',
        'with_front' => true,
        'hierarchical' => true,
    );
    $args = array(
        'labels' => $labels,
        'hierarchical' => true,
        'rewrite' => $rewrite,
    );
    register_taxonomy( 'product_category', 'product', $args );
}
add_action( 'init', 'my_taxonomies_product', 0 );