Get categories for a specific post – Custom post type

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I’m trying to retrieve all the categories which are related to a specific post, using the wp_get_post_categories() function. The problem is that it is a custom post type, so I tried sending it in the $args array : 

wp_get_post_categories($id,array('post_type'=>'product'));

but that returned an empty array as well.
What is the correct way of doing it?

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2 comments

  1. Are you sure it a category, and not a custom taxonomy?

    If it is a category try:

    var_dump( wp_get_post_categories( $id ) );

    or its equivalent since category is a taxonomy:

    var_dump( wp_get_object_terms( $id, 'category' ) );

  2. Your post-type product has probably it’s own “category” taxonomy. Try:

    wp_get_object_terms( $id, '<your-custom-product-category-taxonomy>', array( 'fields' => 'ids' ) );