Autogenerate focus keyword

function update_focus_keyword_for_product($product_id) {
    if (!$product_id || get_post_type($product_id) !== 'product') {
        return;
    }

    $title = get_the_title($product_id);
    if (!$title) {
        return;
    }

    // Convert commas to HTML entities to prevent splitting
    $title = str_replace(',', ',', $title);
    $title = str_replace('×', 'x', $title);

    // Store the exact title (with modified comma) as the focus keyword
    update_post_meta($product_id, 'rank_math_focus_keyword', $title);
}