get_terms gives "invalid taxonomy" from plugin

Question

I'm building a plugin for woocommerce and i have some troubles. I'm trying to get all avalible product categories.

the code simply looks like this:

$cats = get_terms('product_cat', array('hide_empty' => 0, 'orderby' => 'ASC',  'parent' =>0));
print_r($cats);

This gives me

WP_Error Object
(
    [errors:WP_Error:private] => Array
        (
            [invalid_taxonomy] => Array
                (
                    [0] => Invalid taxonomy
                )
        )
    [error_data:WP_Error:private] => Array
    (
    )
)

Do i need to hook this to some special init or something? I tried the same code in functions.php but with the same error.

EDIT: Yep, i found a soluiton to the problem. I added

add_action('init', 'runMyPlugin');

did the trick!

As you have discovered, taxonomies are not registered until the init hook, so you cannot query them until at least init. Instead of editing, add your solution as an answer. — helgatheviking

stillatmylinux stillatmylinux · Accepted Answer · 2016-12-14T04:03:18

Just adding a full code example

add_action('init', 'my_get_woo_cats');

function my_get_woo_cats() {
    $cats = get_terms( array( 'taxonomy' => 'product_cat','hide_empty' => 0, 'orderby' => 'ASC',  'parent' =>0) );
    print_r($cats);
}

get_terms gives "invalid taxonomy" from plugin

2 Answers