Code-Snippets-Functions/Execute a function on a child site/WooCommerce/disable-out-of-stock-variations.txt

add_filter( 'woocommerce_variation_is_active', 'wc_grey_out_variations_out_of_stock', 10, 2 );
 
function wc_grey_out_variations_out_of_stock( $is_active, $variation ) {
    if ( ! $variation->is_in_stock() ) return false;
    return $is_active;
}