Woocommerce - Calculate Exta Fee Based on Amount of People - woocommerce

Question

I've added in a function for a custom field on the product general options:
// Add Custom Field to Product under General
function create_extra_fee_field() {
$args = array(
'id' => 'park_fee',
'label' => __( 'Natl Park Entrance Fee', 'tranq-lsx-child' ),
'class' => 'tranq-custom-field',
'desc_tip' => true,
'description' => __( 'This sets the Fee that will be added to the car.', 'tranq-lsx-child' ),
);
woocommerce_wp_text_input( $args );
}
add_action( 'woocommerce_product_options_general_product_data', 'create_extra_fee_field' );
// Save Custom Field Data
function save_extra_fee_field( $post_id ) {
$product = wc_get_product( $post_id );
$title = isset( $_POST['park_fee'] ) ? $_POST['park_fee'] : '';
$product->update_meta_data( 'park_fee', sanitize_text_field( $title ) );
$product->save();
}
add_action( 'woocommerce_process_product_meta', 'save_extra_fee_field' );
I would like to add this as an extra fee to the Cart Totals which multiplied based on the amount of Person/People that were selected from the Woocommerce Bookings.
Something like this:
// Calculate Extra Fee Based on Amount of People.
add_action('woocommerce_cart_calculate_fees' , 'add_custom_fees');
function add_custom_fees( WC_Cart $cart ){
$park_fee = get_post_meta($item['product_id'] , 'park_fee', true);
foreach( $cart->get_cart() as $item ){
$fees += $item[ 'park_fee' ] * 14706;
}
if( $fees != 0 ){
$cart->add_fee( 'Park Fee', $fees);
}
}
How do I go about in achieving this? Any Links to a walkthrough would be greatly appreciated.

Answer 1

I've added this and it seems to work:
// Add Custom Field to Cart Totals
function woo_add_cart_fee() {
global $woocommerce;
foreach( WC()->cart->get_cart() as $cart_item ){
// Get the WC_Product object (instance)
$product = $cart_item['data'];
$product_id = $product->get_id(); // get the product ID
$custom_field_value = get_post_meta( $product->get_id(), 'park_fee', true );
$person = array_sum( $cart_item['booking']['_persons'] );
}
$additional_fee_name = "Natl Park Entrance Fee";
$extra_fee = $custom_field_value * $person;
$addedFee = false;
// first check to make sure it isn’t already there
foreach ( $woocommerce->cart->get_fees() as $_fee )
{
if ($_fee->id == sanitize_title($additional_fee_name) )
{
$_fee->amount = (float) esc_attr( $extra_fee );
}
}
if (!$addedFee)
{
$woocommerce->cart->add_fee( __($additional_fee_name, "woocommerce"),
$extra_fee, $additional_fee_taxable );
}
}
add_action( "woocommerce_before_calculate_totals", "woo_add_cart_fee" );