wordpress: get category slug from post ID

hi,
did you try this function?
http://codex.wordpress.org/Function_Reference/get_the_category

Yes, previously and again. I don't know why it's not working.

If I use:

$category = get_the_category(); 
	echo $category[0]->cat_name;

Select allOpen in new window

WP_Debug says:
Undefined offset: 0
Trying to get property of non-object

I get the same thing if I pass an ID into get_the_category.

Am I misinterpreting how custom post types work?

maybe you are outside a th loop?

try this
global $post;
$categories = get_the_category($post->ID);
var_dump($categories);

I've tried that too. The code dumps

array(0)

This is happening inside of The Loop.

The wp-e-commerce plugin then operates inside of the the Page, and has its own loop for the product custom post type.

Here are the resources I used to put together the end result, maybe they explain it a little better that I did:

http://justintadlock.com/archives/2010/04/29/custom-post-types-in-wordpress

http://www.deluxeblogtips.com/2010/07/custom-post-type-with-categories-post.html

http://wp.tutsplus.com/tutorials/custom-post-type-pagination-chaining-method/

http://xplus3.net/2010/05/20/wp3-custom-post-type-permalinks/

Wow. If I can really take in all that, and it's been a bit helpful already, I will likely understand enough to answer my own question.

While I chew on that, here's a recap:

I'm using wp-e-commerce. Products are custom post type 'wpsc-product'. They are categorized in a custom taxonomy 'wpsc_product_category'. It has a slug defined.

I know the product ID, and need the slugs of the categories that it is in.

Can you post your code for the custom post type and taxonomy? It might give me a better understanding or what needs to be changed.

The source is here:
http://supersonic.lt/wpec/nav.html?wpsc-core/wpsc-functions.php.source.html

here's the post type

 265          $labels = array(
 266              'name' => _x( 'Products', 'post type name', 'wpsc' ),
 267              'singular_name' => _x( 'Product', 'post type singular name', 'wpsc' ),
 268              'add_new' => _x( 'Add New', 'admin menu: add new product', 'wpsc' ),
 269              'add_new_item' => __('Add New Product', 'wpsc' ),
 270              'edit_item' => __('Edit Product', 'wpsc' ),
 271              'new_item' => __('New Product', 'wpsc' ),
 272              'view_item' => __('View Product', 'wpsc' ),
 273              'search_items' => __('Search Products', 'wpsc' ),
 274              'not_found' =>  __('No products found', 'wpsc' ),
 275              'not_found_in_trash' => __( 'No products found in Trash', 'wpsc' ),
 276              'parent_item_colon' => '',
 277              'menu_name' => __( 'Products', 'wpsc' )
 278            );
 279      // Products
 280      register_post_type( 'wpsc-product', array(
 281          'capability_type' => 'post',
 282          'hierarchical' => true,
 283          'exclude_from_search' => false,
 284          'public' => true,
 285          'show_ui' => true,
 286          'show_in_nav_menus' => true,
 287                  'menu_icon' => WPSC_CORE_IMAGES_URL . "/credit_cards.png",
 288          'labels' => $labels,
 289          'query_var' => true,
 290          'register_meta_box_cb' => 'wpsc_meta_boxes',
 291          'rewrite' => array(
 292              'slug' => $wpsc_page_titles['products'] . '/%wpsc_product_category%',
 293              'with_front' => false
 294          )
 295      ) );

here's the taxonomy:

 323      // Product categories, is heirarchical and can use permalinks
 324      $labels = array(
 325          'name' => _x( 'Categories', 'taxonomy general name', 'wpsc' ),
 326          'singular_name' => _x( 'Product Category', 'taxonomy singular name', 'wpsc' ),
 327          'search_items' => __( 'Search Product Categories', 'wpsc' ),
 328          'all_items' => __( 'All Product Categories', 'wpsc' ),
 329          'parent_item' => __( 'Parent Product Category', 'wpsc' ),
 330          'parent_item_colon' => __( 'Parent Product Category:', 'wpsc' ),
 331          'edit_item' => __( 'Edit Product Category', 'wpsc' ),
 332          'update_item' => __( 'Update Product Category', 'wpsc' ),
 333          'add_new_item' => __( 'Add New Product Category', 'wpsc' ),
 334          'new_item_name' => __( 'New Product Category Name', 'wpsc' )
 335      );
 336      register_taxonomy( 'wpsc_product_category', 'wpsc-product', array(
 337          'hierarchical' => true,
 338          'rewrite' => array(
 339              'slug' => $wpsc_page_titles['products'],
 340              'with_front' => false
 341          ),
 342              'labels' => $labels
 343      ) );

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