Declaring a Sample CPT and Custom Menu

sample-cpt-menu

// Create the CPT using special caps
add_action( 'init', 'register_cpt_sample_cpt' );
function register_cpt_sample_cpt() {
    $labels = array( 
        'name' => _x( 'Sample CPT', 'sample_cpt' ),
        'singular_name' => _x( 'Sample CPT', 'sample_cpt' ),
        'add_new' => _x( 'Add New', 'sample_cpt' ),
        'add_new_item' => _x( 'Add New Sample CPT', 'sample_cpt' ),
        'edit_item' => _x( 'Edit Sample CPT', 'sample_cpt' ),
        'new_item' => _x( 'New Sample CPT', 'sample_cpt' ),
        'view_item' => _x( 'View Sample CPT', 'sample_cpt' ),
        'search_items' => _x( 'Search Sample CPT', 'sample_cpt' ),
        'not_found' => _x( 'No sample cpt found', 'sample_cpt' ),
        'not_found_in_trash' => _x( 'No sample cpt found in Trash', 'sample_cpt' ),
        'parent_item_colon' => _x( 'Parent Sample CPT:', 'sample_cpt' ),
        'menu_name' => _x( 'Sample CPT', 'sample_cpt' ),
    );

    $args = array( 
        'labels' => $labels,
        'hierarchical' => false,
        
        'supports' => array( 'title', 'editor' ),
        
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => 'custom_menu',
        
        'show_in_nav_menus' => true,
        'publicly_queryable' => true,
        'exclude_from_search' => false,
        'has_archive' => true,
        'query_var' => true,
        'can_export' => true,
        'rewrite' => true,
        'capability_type' => 'sample_cpt',
        'map_meta_cap' => true
    );

    register_post_type( 'sample_cpt', $args );
}

add_action( 'admin_menu', array( $this, 'register_admin_page_aggregator' ) );
add_menu_page(  $page_title = 'Custom Menu', 
                $menu_title = 'Custom Menu',   
                $capability = 'edit_sample_cpt', 
                $menu_slug = 'custom_menu', 
                $function = 'sample_display_function', 
                $icon_url = 'dashicons-arrow-right', 
                $position = 48 );