capability_type image controler wp code example
Example: wordpress register post type
function book_setup_post_type() {
$args = array(
'public' => true,
'label' => __( 'Books', 'textdomain' ),
'menu_icon' => 'dashicons-book',
);
register_post_type( 'book', $args );
}
add_action( 'init', 'book_setup_post_type' );