1. Navigate to the ch11-hello-world folder of the WordPress plugin directory of your development installation.
2. Open the ch11-hello-world.php file in a text editor.
3. Add the following line of code at the end of the file to declare a new shortcode that will be available to content authors:

add_shortcode( 'hello-world', 'ch11hw_hello_world_shortcode' ); 

4. Add the following code section to provide an implementation for the ch11hw_hello_world_shortcode function:

function ch11hw_hello_world_shortcode() { 
    $options = get_option( 'ch11hw_options' ); 
     
    $output = sprintf( __( 'The current text string is: %s.', 
                           'ch11hw_hello_world' ),
                           $options['default_text'] ); 
    return $output; 
} 

5. Save and close the plugin file.
6. Create a new page (using the Ajouter item of the Pages menu) and insert the new shortcode [hello-world] in the content, then publish the page (Publier).

7. View the page (Voir la page) to see the output of the shortcode: