我会这样做：-

   // Make sure we don\'t expose any info if called directly
if ( ! defined(\'ABSPATH\') ){
    die;
}

if(!defined(\'MY_PLUGIN_PATH\')) { 
    define( \'MY_PLUGIN_PATH\', plugin_dir_path(__FILE__) ); 
}

if( ! class_exists(\'MyBestPlugin\') ){
        class MyBestPlugin {

            public function __construct(){
                register_activation_hook( __FILE__ , array( $this, \'mbp_activate\' ) );
                register_deactivation_hook( __FILE__ , array( $this, \'mbp_deactivate\' ) );
                if(get_option(\'cpt_enable\')){
                   add_action( \'init\', array($this, \'cpt\' ) ); 
                } //get the \'cpt enabled option if available.Hit the hook\'
            }

            public function mbp_activate(){
                require_once MY_PLUGIN_PATH .\'inc/yes.php\';
                MBPActivate::activate();
            }

            public function mbp_deactivate(){
                require_once MY_PLUGIN_PATH .\'inc/yes.php\';
                MBPActivate::deactivate();
            }

            public function cpt(){
                $args = array(
                                \'public\'    => true,
                                \'label\'     => __( \'Books\', \'textdomain\' ),
                                \'menu_icon\' => \'dashicons-book\',
                            );
                register_post_type( \'book\', $args );
            }

        }

        $pluginInstance = new MyBestPlugin();

}

class MBPActivate {
        public function activate(){
            add_option(\'cpt_enable\',\'cpt_enable\'); // set the cpt enabled option after activation hook.
            flush_rewrite_rules();
        }
        public function deactivate(){
            delete_option(\'cpt_enable\');
            flush_rewrite_rules();
        }
    }
    $plugin = new MBPActivate();

请尝试以下代码

my-plugin.php file

<?php
/**
Plugin Name: My Plugin
Plugin URI: http://#####
Description: This plugin just for test
Author: Chetan Vaghela
Version: 1.0.0
Author URI: http://che##la.###/
*/
if ( ! defined(\'ABSPATH\') ){
        die;
}
if(!defined(\'MY_PLUGIN_PATH\')) { 
    define( \'MY_PLUGIN_PATH\', plugin_dir_path(__FILE__) ); 
}

function mbp_activate(){
  flush_rewrite_rules();
  add_option( \'my_plugin_activated\', time() );
}
require_once MY_PLUGIN_PATH .\'inc/mbp-plugin-activate.php\';
function run_mbpactive() {

    $plugin = new MBPActivate();

}
run_mbpactive();

register_activation_hook( __FILE__ , \'mbp_activate\'  );


register_uninstall_hook( __FILE__, \'my_plugin_uninstall\' );
function my_plugin_uninstall() {
     unregister_post_type( \'book\' );
     delete_option("my_plugin_activated");
}

inc/mbp-plugin-active.php file

<?php
class MBPActivate {

     public function __construct() {

        add_action( \'init\', array($this, \'cptcallback\' ) );

    }

    public function cptcallback(){

       // / die("calledddd");
        $books_labels = array(
            \'name\'               => _x( \'Books\', \'Books name\', \'text-domain\' ),
            \'singular_name\'      => _x( \'Book\', \'Books name\', \'text-domain\' ),
            \'menu_name\'          => _x( \'Books\', \'admin menu\', \'text-domain\' ),
            \'name_admin_bar\'     => _x( \'Books\', \'add new on admin bar\', \'text-domain\' ),
            \'add_new\'            => _x( \'Add New\', \'Books\', \'text-domain\' ),
            \'add_new_item\'       => __( \'Add New Books\', \'text-domain\' ),
            \'new_item\'           => __( \'New Books\', \'text-domain\' ),
            \'edit_item\'          => __( \'Edit Books\', \'text-domain\' ),
            \'view_item\'          => __( \'View Books\', \'text-domain\' ),
            \'all_items\'          => __( \'All Books\', \'text-domain\' ),
            \'search_items\'       => __( \'Search Books\', \'text-domain\' ),
            \'parent_item_colon\'  => __( \'Parent Books:\', \'text-domain\' ),
            \'not_found\'          => __( \'No Books found.\', \'text-domain\' ),
            \'not_found_in_trash\' => __( \'No Books found in Trash.\', \'text-domain\' )
        );

        $books_args = array(
            \'labels\'             => $books_labels,
            \'description\'        => __( \'Description.\', \'text-domain\' ),
            \'public\'             => true,
            \'publicly_queryable\' => true,
            \'show_ui\'            => true,
            \'show_in_menu\'       => true,
            \'query_var\'          => true,
            \'rewrite\'            => array( \'slug\' => \'book\' ),
            \'capability_type\'    => \'post\',
            \'has_archive\'        => true,
            \'hierarchical\'       => false,
            \'menu_position\'      => null,
            \'supports\'           => array( \'title\', \'editor\', \'author\', \'thumbnail\', \'excerpt\', \'comments\' ),
            \'menu_icon\'          => \'dashicons-testimonial\'
        );
        register_post_type( \'book\', $books_args );

    }
}