Woocommerce Force Sells/Bookings - Snippet to force number of person in a booking

// only add one force sell item per product no matter how many of the original product are added
function my_wc_force_sell_add_to_cart_product( $product ){
    $product['quantity'] = 1;
    return $product;
}
add_filter( 'wc_force_sell_add_to_cart_product', 'my_wc_force_sell_add_to_cart_product' );

// when a synced force sell product is updated always set it to 1
function my_wc_force_sell_update_quantity( $quantity, $product ){
    return 1;
}
add_filter( 'wc_force_sell_update_quantity', 'my_wc_force_sell_update_quantity' );

function my_wc_force_sell_add_to_cart_product( $product ){
    foreach(WC()->cart->get_cart() as $cart_item) {
    // The item persons count
    $person = array_sum( $cart_item['booking']['_persons'] );
}
    $product['quantity'] = $person;
    return $product;
}
add_filter( 'wc_force_sell_add_to_cart_product', 'my_wc_force_sell_add_to_cart_product' );

// when a synced force sell product is updated always set it to 1
function my_wc_force_sell_update_quantity( $quantity, $product ){
    return 1;
}
add_filter( 'wc_force_sell_update_quantity', 'my_wc_force_sell_update_quantity' );