Answers for "woo get product variations"

woocommerce get product categories

$terms = get_the_terms( $product_id, 'product_cat' );
foreach ($terms as $term) {
    $product_cat_id[] = $term->term_id;
}

wp get all variations for a product

$product = wc_get_product($product_id);
$variations = $product->get_available_variations();
$variations_id = wp_list_pluck( $variations, 'variation_id' );