Basic implementation of Drupal 7 hook_views_data()

drupal-hook-views-data.php

<?php
/**
 * Implements hook_views_data().
 */
function my_custom_module_views_data() {
  $data['my_custom_module']['table']['group'] = t('My custom module');
  $data['my_custom_module']['table']['join'] = array(
    // Exist in all views.
    '#global' => array(),
  );
 
  $data['my_custom_module']['my_custom_field'] = array(
    'title' => t('My custom field'),
    'help' => t('My custom field displays the word "Some custom markup".'),
    'field' => array(
      'handler' => 'views_handler_my_custom_field',
    ),
  );
 
  return $data;
}