<?php
class Make_Sort_By extends WP_REST_Controller {
    private $post_type;
    private $sort_type;
    function __construct($sort_type, $post_type) {
        $this->post_type = $post_type;
        $this->sort_type = $sort_type;
    }
    /**
     * Register the routes for the objects of the controller.
     */
    public function register_custom_route($route) {
        $version = '2';
        $namespace = 'craft/v' . $version;
        register_rest_route( $namespace, '/' . $route . '/' . $this->post_type, [
            array(
                'methods'  => WP_REST_Server::READABLE,
                'callback' => array( $this, $this->sort_type )
            ),
        ]);
    }

    public function by_alpha( $request ) {
        $params = $request->get_params();
        global $wpdb;
        $res = $wpdb->get_results($wpdb->prepare(
            "SELECT * FROM wp_posts
            WHERE post_type = %s 
            AND post_status='publish'
            ORDER BY SUBSTRING_INDEX(post_title, ' ', -1)",
            $this->post_type
        ));
        wp_reset_postdata();

        $collection = array();
    
        forEach( $res as $key=>$item ) {
            $filtered = array();
            $filtered[id] = $item->ID;
            $filtered[slug] = $item->post_name;
            $filtered[type] = $item->post_type;
            $filtered[title] = $item->post_title;
            $filtered[excerpt] = $item->post_excerpt;
            $filtered[date] = $item->post_date;
            $filtered[content] = $item->post_content;
            $filtered[hero] = get_post_meta( $item->ID, 'hero_header', true );
            $collection[$key] = $filtered;
        };
        return new WP_REST_Response( $collection, 200 );
    }
}

?>