Custom order data example - AJAX receiver

wps-custom-order-data-ajax-action.php

<?php

/*

Step 2. Save any dynamic values to the users Session
We're calling this function from the frontend javascript via the 'save_dynamic_values_to_session' AJAX action.

*/
function save_dynamic_values_to_session() {

  // Gain access to the global $_SESSION variable
  if (session_status() == PHP_SESSION_NONE) {
    session_start();
  }

  // Clearing any existing values set to our Session variable first
  unset($_SESSION['dynamic_values']);

  // Checking to see if the data was passed to the server correctly
  if (isset($_POST['dynamicValues']) && $_POST['dynamicValues']) {

    // Set our session variable to the data coming from the client
    $_SESSION['dynamic_values'] = $_POST['dynamicValues'];

  } else {
    wp_send_json_error('No dynamic values found');
  }

  wp_send_json_success();

}

add_action( 'wp_ajax_save_dynamic_values_to_session', 'save_dynamic_values_to_session');
add_action( 'wp_ajax_nopriv_save_dynamic_values_to_session', 'save_dynamic_values_to_session');