Get all “active” attributes taxonomies attached to products in WooCommerce?

问题

I want to get all "active" attributes list that attached to the products,

so if the attribute exists, but don't attach to any products don't display.

I can display all attributes as dropdown like this:

$attributes =  wc_get_attribute_taxonomies();

if($attributes) {
    echo '<select name="all-attributes" id="all-attributes">';
    foreach ( $attributes as $attribute ) {
        echo '<option value="' . $attribute->attribute_name . '">' . $attribute->attribute_label . '</option>';
    }
    echo '</select>';
}

But this way I'm getting all attributes, even non active attributes is not attached.

How to get all active product attributes taxonomies attached to products in WooCommerce?

回答1:

To get all active product attributes taxonomies (attached a least to a product) you will need a custom simple sql query as follow (embedded in a php function):

function wc_get_active_attribute_taxonomies() {
    global $wpdb;

    return $wpdb->get_results( "
        SELECT DISTINCT  wat.*, tt.taxonomy
        FROM {$wpdb->prefix}woocommerce_attribute_taxonomies wat
        INNER JOIN {$wpdb->prefix}term_taxonomy tt
            ON tt.taxonomy = CONCAT('pa_', wat.attribute_name)
        INNER JOIN {$wpdb->prefix}term_relationships tr
            ON tt.term_taxonomy_id = tr.term_taxonomy_id
        WHERE tt.count > 0
    " );
}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

---

USAGE (based on your code):

Just replace:

$attributes = wc_get_attribute_taxonomies();

by:

$attributes = wc_get_active_attribute_taxonomies();

Note: This query output, includes additionally the "taxonomy" argument.

来源：https://stackoverflow.com/questions/61952878/get-all-active-attributes-taxonomies-attached-to-products-in-woocommerce