I created a custom post type called 'map' and registered a new taxonomy for it. Now, I need to get, through a loop, every term of 'map'. So far, I had a "invalid taxonomy" which I do not understand why so. Everything is working perfectly except this!

How I register my new taxonomy (in functions.php):

function create_map_taxonomy() {
        $labels = array(
            'name'                       => _x( 'Map_Category', 'taxonomy general name', 'textdomain' ),
            'singular_name'              => _x( 'Map_Category', 'taxonomy singular name', 'textdomain' ),
            'search_items'               => __( 'Search Map_Category', 'textdomain' ),
            'popular_items'              => __( 'Popular Map_Category', 'textdomain' ),
            'all_items'                  => __( 'All Map_Category', 'textdomain' ),
            'parent_item'                => null,
            'parent_item_colon'          => null,
            'edit_item'                  => __( 'Edit Map_Category', 'textdomain' ),
            'update_item'                => __( 'Update Map_Category', 'textdomain' ),
            'add_new_item'               => __( 'Add New Map_Category', 'textdomain' ),
            'new_item_name'              => __( 'New Map_Category Name', 'textdomain' ),
            'separate_items_with_commas' => __( 'Separate Map_Category with commas', 'textdomain' ),
            'add_or_remove_items'        => __( 'Add or remove Map_Category', 'textdomain' ),
            'choose_from_most_used'      => __( 'Choose from the most used Map_Category', 'textdomain' ),
            'not_found'                  => __( 'No Map_Category found.', 'textdomain' ),
            'menu_name'                  => __( 'Map_Category', 'textdomain' ),

        $args = array(
            'hierarchical'          => true,
            'labels'                => $labels,
        register_taxonomy( 'map_category', 'map', $args );
    add_action( 'init', 'create_map_taxonomy', 0 );

And this is my code in footer.php:

    $args = array(
        'post_type' => 'map',

    $map_query = new WP_Query($args);

    while ($map_query->have_posts()) : $map_query->the_post();

        $img_background = get_field('image_background');
        $cat = get_terms(get_the_id(), 'map_category');


The result is always "invalid taxonomy". But how is it a invalid taxonomy when I can see it in admin pages?

  • You are trying to get terms earlier than taxonomy is registered. – Max Yudin Jan 16 '18 at 20:45
  • How's that even possible? My code to retrieve the terms are in footer.php. How could I fix this? – Citizen602214085 Jan 16 '18 at 20:46
  • Try to remove priority from add_action() or at least make it >= 1. I don't think zero is allowed. I am not sure, I don't know what happens in the footer except what I see here. – Max Yudin Jan 16 '18 at 20:55
  • I changed the priority from add_action() but I still have the same errors : invalid taxonomy. – Citizen602214085 Jan 16 '18 at 21:36

get_terms is not the function you need. This function retrieves an array of WP_Term objects for all terms within the given taxonomy

Update your code to use wp_get_post_terms instead of get_terms. You can keep the same parameters. This function will retrieve the terms used on the current post.

  • EXACTLY! I was reading everything about hooks and filters because I thought it was an issue with the priorities. But I was wrong! A thousand thank you for you sir, you saved my day! – Citizen602214085 Jan 16 '18 at 22:20

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