Hooks & Action Filters

Basis of plugin creation – modify how WordPress behaves.

Two types:  action hooks and filters

Have to write a callback function and register that function to use in  specfici action or filter.

function test(){


  //Do something
}
add_action('hook','test');
add_filter('filter','test');

What is the difference? Action hook is used to add something at a certain point in WordPress execution. JavaScript or CSS.

Used to modify info that already exists. Or make it vanish! Returns something.

WordPress comes with lots of action hooks & filters – but can also create your own.