How to use rdf_header action in WordPress

rdf_header action

Hey there! If you’re diving into WordPress development, you’ve probably come across the rdf_header action. This action fires at the end of the RDF feed header. To use it, you need to register it using add_action. You can place this code into the functions.php file of your activated theme or a custom WordPress plugin.

At WePlugins, we always prefer creating a custom WordPress plugin when using hooks to ensure nothing breaks when your theme gets updated. Below, I’ll show you how to define a function execute_on_rdf_header_event and register it with add_action. The first parameter rdf_header is the name of the hook, the second parameter is the name of the function to be called, the third parameter is the priority of calling the hook if used multiple times, and the last parameter is the number of arguments (if any) to be passed to the registered function.

Sometimes, you might need to remove a registered hook. You can do this using remove_action.

Parameters

• No parameters

Live Example 1

Below is an example of how you can use this hook.

    function weplugins_execute_on_rdf_header_event(){
        // You can write code here to be executed when this action occurs in your WordPress website.
    }
    // Add the action
    add_action( "rdf_header", "weplugins_execute_on_rdf_header_event");
    

Live Example 2

To remove a hook callback, use the example below.

    remove_action( "rdf_header", "weplugins_execute_on_rdf_header_event");
    

Please make sure to provide the same callback function name, priority, and number of arguments while removing the hook callback.

Live Example 3

Another practical usage scenario might involve logging when the RDF header action is fired.

    function weplugins_log_rdf_header_event(){
        error_log('RDF header action fired.');
    }
    // Add the action
    add_action( "rdf_header", "weplugins_log_rdf_header_event");