官方文档：developer.wordpres…

//自定义路由，返回网站基本信息
function api_get_info() {
	$data = array(//自定义要返回的数据
		"name" => get_bloginfo("name"),
		"description" => get_bloginfo("description"),
		"url" => get_bloginfo("url"),
		"admin_email" => get_bloginfo("admin_email")
	);
	if ( empty( $data ) ) {
		return null;
	}
	return $data;
}
add_action( 'rest_api_init', function () {
	register_rest_route( 'wp/v2', '/info', array(
		'methods' => 'GET',
		'callback' => 'api_get_info',
	) );
} );

自定义后api地址为：http://网站地址（或wordpress安装路径）/wp-json/wp/v2/info

{//api返回结果
  "name": "斑码",
  "description": "我的收藏小站",
  "url": "studio.beetheme.cn",
  "admin_email": "banma@88.com"
}