Generated Function:
Copy and use below hooks in functions.php
function custom_post_type() {
$labels = array(
'name' => _x( 'Custom Posts', 'Portfolio General Name', 'Textdomain' ),
'singular_name' => _x( 'Custom Post', 'Post Type Singular Name', 'Textdomain' ),
'menu_name' => _x( 'Custom Posts', 'Admin Menu text', 'Textdomain' ),
'name_admin_bar' => _x( 'portfolio', 'Add New on Toolbar', 'Textdomain' ),
'archives' => __( 'portfolio Archives', 'Textdomain' ),
'attributes' => __( 'portfolio Attributes', 'Textdomain' ),
'parent_item_colon' => __( 'Parent portfolio:', 'Textdomain' ),
'all_items' => __( 'All Custom Posts', 'Textdomain' ),
'add_new_item' => __( 'Add New portfolio', 'Textdomain' ),
'add_new' => __( 'Add New', 'Textdomain' ),
'new_item' => __( 'New portfolio', 'Textdomain' ),
'edit_item' => __( 'Edit portfolio', 'Textdomain' ),
'update_item' => __( 'Update portfolio', 'Textdomain' ),
'view_item' => __( 'View portfolio', 'Textdomain' ),
'view_items' => __( 'View Custom Posts', 'Textdomain' ),
'search_items' => __( 'Search portfolio', 'Textdomain' ),
'not_found' => __( 'Not found', 'Textdomain' ),
'not_found_in_trash' => __( 'Not found in Trash', 'Textdomain' ),
'featured_image' => __( 'Featured Image', 'Textdomain' ),
'set_featured_image' => __( 'Set featured image', 'Textdomain' ),
'remove_featured_image' => __( 'Remove featured image', 'Textdomain' ),
'use_featured_image' => __( 'Use as featured image', 'Textdomain' ),
'insert_into_item' => __( 'Insert into portfolio', 'Textdomain' ),
'uploaded_to_this_item' => __( 'Uploaded to this Custom Post', 'Textdomain' ),
'items_list' => __( 'Custom Posts list', 'Textdomain' ),
'items_list_navigation' => __( 'Custom Posts list navigation', 'Textdomain' ),
'filter_items_list' => __( 'Filter Custom Posts list', 'Textdomain' ),
);
$args = array(
'label' => __( 'Custom Posts', 'Textdomain' ),
'supports' => ["title","editor"],
'taxonomies' => ["post_tag"],
'description' => __( 'Custom Posts', 'Textdomain' ),
'labels' => $labels,
'menu_icon' => 'dashicons-admin-appearance',
'public' => true,
'show_ui' => true,
'show_in_menu' => true,
'menu_position' => 5,
'show_in_admin_bar' => true,
'show_in_nav_menus' => false,
'can_export' => false,
'has_archive' => true,
'hierarchical' => false,
'exclude_from_search' => false,
'show_in_rest' => true,
'publicly_queryable' => true,
'capability_type' => 'post',
);
register_post_type( 'custompost', $args );
}
add_action( 'init', 'custom_post_type', 0 );