Using hooks

Where to add custom code

If you use a hook to add or manipulate code, you can add your custom code in a variety of ways:

• To a custom child theme’s functions.php file.
• Using a plugin such as Code Snippets.

Using action hooks

To execute your own code, you hook in by using the action hook do_action('action_name'); . It will look something like so:

add_action( 'action_name', 'your_function_name' );
function your_function_name() {
    // Your code
} 

Using filter hooks

Filters are used to manipulate a value. Filter hooks are called throughout are code using apply_filter( 'filter_name', $variable ); . To manipulate the passed variable, you can do something like the following:

add_filter( 'filter_name', 'your_function_name' );
function your_function_name( $variable ) {
    // Your code
    return $variable;
}

With filters, you must return a value.