WordPress Plugin Development Cookbook - Second Edition

How to do it...

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' ) ) { ...