Entity Metadata Wrapper hooks for Drupal 7 user data abstraction

oop-drupal-7-user-metadata-wrapper-hooks.php

<?php
/**
 * Implements hook_entity_property_info_alter().
 */
function my_custom_module_entity_property_info_alter(&$info) {
  $properties = &$info['user']['properties'];
 
  $properties['employee_number'] = array(
    'label' => t("Employee number"),
    'description' => t("The employee number of this user."),
    'type' => 'integer',
    'getter callback' => 'my_custom_module_get_employee_number',
    'setter callback' => 'my_custom_module_set_employee_number',
  );
}
 
/**
 * Entity API getter for user account employee number.
 *
 * @see my_custom_module_entity_property_info_alter().
 */
function my_custom_module_get_employee_number($account, array $options, $name, $entity_type) {
  $employee_details = new EmployeeDetails($account);
  return $employee_details->getEmployeeNumber();
}
 
/**
 * Entity API setter for user account employee number.
 *
 * @see my_custom_module_entity_property_info_alter().
 */
function my_custom_module_set_employee_number($account, $name, $value) {
  $employee_details = new EmployeeDetails($account);
  $employee_details->setEmployeeNumber($value);
}