Change permalink for a single post type only

At present I’m using this permalink structure /%category%/%postname%/. There are some existing post type. I want to change permalink for image post type to image/%post_id%/, and don’t want to affect other post type and their permalinks.

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This will be done when you register_post_type :

  $args = array(
        'rewrite' => array( 'slug' => 'book' ),

    register_post_type( 'book', $args );

IMPORTANT ! Remember to go to wp-admin options > permalink and click SAVE on that page for the changes to take effect.

I would give the Custom Post Type Permalinks plugin a try (it sounds like it will allow you to do exactly what you want).

Alternatively you could probably manually edit your rewrite rules (in .htaccess), however re-saving your permalink settings would probably reset your rules each time.

Hope that helps, have fun!