[API] Một ví dụ lấy WP_REST_Request $request (ok)

<?php
/**
 * Grab latest post title by an author!
 *
 * @param array $data Options for the function.
 * @return string|null Post title for the latest,
 * or null if none.
 */
function my_awesome_func(WP_REST_Request $request) {
  $parameters = $request->get_params();
  var_export($parameters);
  // The individual sets of parameters are also available, if needed:
  $parameters = $request->get_url_params();
  var_export($parameters);
  $parameters = $request->get_query_params();
  var_export($parameters);
}
add_action('rest_api_init', function () {
  register_rest_route('myplugin/v1', '/author/(?P<id>\d+)', array(
    'methods'  => 'GET',
    'callback' => 'my_awesome_func',
  ));
});
?>