Custom hidden field on WooCommerce checkout not saving to user meta issue - php

Question

I cannot figure out what i am missing here.
I am creating a hidden field on the checkout page, that contains a value after a customer's choice.
This part is working, as i can see in the inspector on the checkout page.
The hidden field should be saved to the logged-in user, as i need it on another place in the website.
I have the following:
//This part is working!!
add_action( 'woocommerce_after_checkout_billing_form', function() {
global $woocommerce;
$items = $woocommerce->cart->get_cart();
foreach($items as $item => $values) {
if( isset($values['programmakeuze']) ){
echo '<input type="hidden" name="programchoice" id="programchoice" class="input-hidden" value="'.$values['programmakeuze'].'">';
}
}
});
//Save hidden field to user
function elearning_checkout_update_user_meta( $customer_id, $posted ) {
if (!empty($_POST['programchoice'])) {
$program = intval($_POST['programchoice'] );
update_user_meta( $customer_id, 'programchoice', $program);
}
}
add_action( 'woocommerce_checkout_update_user_meta', 'elearning_checkout_update_user_meta', 10, 2 );
function testing(){
$id = get_current_user_id();
$value = get_user_meta($id,'programchoice',true);
if ( !empty($value)) {
var_dump ($value);
}
}
add_action('wp_head','testing');
The $value returns nothing. What am i missing here?

Answer 1

I've partly rewritten your code. Including the use of woocommerce_checkout_update_customer action hook.
Also note the use of break in the for loop, as this is about a specific ID, and therefore about 1 unique field
However, I wouldn't use the wp_head action hook for debugging. See How to debug in WooCommerce instead.
But this should suffice, to answer your question:
// Display a custom hidden field after checkout billing form
function action_woocommerce_after_checkout_billing_form( $checkout ) {
// Loop through cart items
foreach( WC()->cart->get_cart() as $cart_item ) {
if ( isset( $cart_item['programmakeuze'] ) ) {
echo '<input type="hidden" name="programchoice" id="programchoice" class="input-hidden" value="' . $cart_item['programmakeuze'] . '">';
break;
}
}
}
add_action( 'woocommerce_after_checkout_billing_form', 'action_woocommerce_after_checkout_billing_form', 10, 1 );
// Save/update user data from custom field value
function action_woocommerce_checkout_update_customer( $customer, $data ) {
// Isset
if ( isset( $_POST['programchoice'] ) ) {
$customer->update_meta_data( '_programchoice', sanitize_text_field( $_POST['programchoice'] ) );
}
}
add_action( 'woocommerce_checkout_update_customer', 'action_woocommerce_checkout_update_customer', 10, 2 );
// Debugging purposes
function action_wp_head(){
// Get user id
$user_id = get_current_user_id();
// Get user meta
$value = get_user_meta( $user_id, '_programchoice', true );
// NOT empty
if ( ! empty( $value ) ) {
var_dump ( $value );
}
}
add_action( 'wp_head', 'action_wp_head' );