1. Navigate to the WordPress plugin directory of your development installation.
2. Create a new directory called ch11-hello-world.
3. Navigate to the directory and create a text file called ch11-hello-world.php.
4. Open the new file in a code editor and add an appropriate header at the top of the plugin file, naming the plugin Chapter 11 - Hello World.
5. Add the following line of code to register a function to be called when the plugin is activated:

register_activation_hook( __FILE__, 
                         'ch11hw_set_default_options_array' ); 

6. Insert the following block of code to provide an implementation for the ch11hw_set_default_options_array function:

function ch11hw_set_default_options_array() { 
    if ( false === get_option( 'ch11hw_options' ) ) { 
        $new_options = array(); 
        $new_options['default_text'] = __( 'Hello World',
                                           'ch11hw_hello_world' ); 
        add_option( 'ch11hw_options', $new_options ); 
    }  
} 

7. Save and close the plugin file.
8. Navigate to the Extensions (Plugins in French) management page and click on the Activer (Activate in French) link for the Chapter 11 - Hello World plugin.
9. Using phpMyAdmin, find the options table entry where the option_name field has a value of ch11hw_options to see the newly created option: