do_feed()

Source

function do_feed() {
	global $wp_query;

	$feed = get_query_var( 'feed' );

	// Remove the pad, if present.
	$feed = preg_replace( '/^_+/', '', $feed );

	if ( '' === $feed || 'feed' === $feed ) {
		$feed = get_default_feed();
	}

	if ( ! has_action( "do_feed_{$feed}" ) ) {
		wp_die( __( '<strong>Error:</strong> This is not a valid feed template.' ), '', array( 'response' => 404 ) );
	}

	/**
	 * Fires once the given feed is loaded.
	 *
	 * The dynamic portion of the hook name, `$feed`, refers to the feed template name.
	 *
	 * Possible hook names include:
	 *
	 *  - `do_feed_atom`
	 *  - `do_feed_rdf`
	 *  - `do_feed_rss`
	 *  - `do_feed_rss2`
	 *
	 * @since 2.1.0
	 * @since 4.4.0 The `$feed` parameter was added.
	 *
	 * @param bool   $is_comment_feed Whether the feed is a comment feed.
	 * @param string $feed            The feed name.
	 */
	do_action( "do_feed_{$feed}", $wp_query->is_comment_feed, $feed );
}

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