Get all variations of a variable product - WooCommerce

To get all variations ID of a variable product, we can use the below code snippet.

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

The above code will provide visible variation IDs only. For example, If the price is not set for a variation, that variation will be hidden.

Altrenativly we can use the below code snippet to get all variations without considering visibility.

$product = wc_get_product($product_id);
$current_products = $product->get_children();