how to create post type on wordpress code example

Example 1: 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' );

Example 2: get name custom post type wordpress

$pt = get_post_type_object( 'books' );

// These two usually contain the post type name in plural. 
// They may differ though.
echo $pt->label;
echo $pt->labels->name;

// This one holds the post type name in singular.
echo $pt->labels->singular_name;