Using WordPress ‘do_feed_{$feed}’ PHP action

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The do_feed_{$feed} WordPress PHP action fires once a specific feed is loaded. The dynamic portion of the hook name, $feed, refers to the feed template name. Possible hook names include:

  • do_feed_atom
  • do_feed_rdf
  • do_feed_rss
  • do_feed_rss2

Usage

add_action('do_feed_{$feed}', 'your_custom_function', 10, 2);

function your_custom_function($is_comment_feed, $feed) {
    // your custom code here
}

Parameters

  • $is_comment_feed (bool) – Whether the feed is a comment feed.
  • $feed (string) – The feed name.

More information

See WordPress Developer Resources: do_feed_{$feed}

Examples

Modify RSS feed content

Modify the content of RSS feed items.

add_action('do_feed_rss2', 'modify_rss_feed_content', 10, 2);

function modify_rss_feed_content($is_comment_feed, $feed) {
    if (!$is_comment_feed) {
        // Change the content of RSS feed items
    }
}

Add a custom feed type

Create a custom feed type named ‘json’.

add_action('do_feed_json', 'generate_json_feed', 10, 2);

function generate_json_feed($is_comment_feed, $feed) {
    // Generate the JSON feed
}

Disable comment feeds

Disable all comment feeds.

add_action('do_feed_{$feed}', 'disable_comment_feeds', 10, 2);

function disable_comment_feeds($is_comment_feed, $feed) {
    if ($is_comment_feed) {
        wp_die(__('Comment feeds are not available.'));
    }
}

Add custom data to Atom feed

Add custom data to Atom feed items.

add_action('do_feed_atom', 'add_custom_data_to_atom_feed', 10, 2);

function add_custom_data_to_atom_feed($is_comment_feed, $feed) {
    if (!$is_comment_feed) {
        // Add custom data to Atom feed items
    }
}

Limit the number of posts in RSS2 feed

Limit the number of posts in RSS2 feed to 5.

add_action('do_feed_rss2', 'limit_rss2_feed_posts', 10, 2);

function limit_rss2_feed_posts($is_comment_feed, $feed) {
    if (!$is_comment_feed) {
        // Change the number of posts in RSS2 feed to 5
        query_posts('posts_per_page=5');
    }
}