<?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( $data ) {

 $posts = get_posts( array(
   'author' => $data['id'],
 ) );

 if ( empty( $posts ) ) {
   return new WP_Error( 'no_author', 'Invalid author', array( 'status' => 404 ) );
 }

 return $posts[0]->post_title;

}<?php add_action( 'rest_api_init', function () {

 register_rest_route( 'myplugin/v1', '/author/(?P<id>\d+)', array(
   'methods' => 'GET',
   'callback' => 'my_awesome_func',
   'args' => array(
     'id' => array(
       'validate_callback' => function($param, $request, $key) {
         return is_numeric( $param );
       }
     ),
   ),
 ) );

} );<?php function my_awesome_func( WP_REST_Request $request ) {

 // You can access parameters via direct array access on the object:
 $param = $request['some_param'];

 // Or via the helper method:
 $param = $request->get_param( 'some_param' );

 // You can get the combined, merged set of parameters:
 $parameters = $request->get_params();

 // The individual sets of parameters are also available, if needed:
 $parameters = $request->get_url_params();
 $parameters = $request->get_query_params();
 $parameters = $request->get_body_params();
 $parameters = $request->get_json_params();
 $parameters = $request->get_default_params();

 // Uploads aren't merged in, but can be accessed separately:
 $parameters = $request->get_file_params();

}{

 "name": "WordPress Site",
 "description": "Just another WordPress site",
 "url": "http://example.com/",
 "namespaces": [
   "wp/v2",
   "vendor/v1",
   "myplugin/v1",
   "myplugin/v2",
 ]

}http://example.com/wp-json/myplugin/v1/author/(?P\d+)`.http://example.com/wp-json/myplugin/v1/author/

Summary

Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:

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You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

You may select the license of your choice.