February 11, 2011 
Definition:
function do_feed() {}
Loads the feed template from the use of an action hook.
If the feed action does not have a hook, then the function will die with a message telling the visitor that the feed is not valid.
Defined actions
- $hook
do_action( $hook, $wp_query->is_comment_feed );
Source code
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();
$hook = 'do_feed_' . $feed;
if ( !has_action($hook) ) {
$message = sprintf( __( 'ERROR: %s is not a valid feed template.' ), esc_html($feed));
wp_die( $message, '', array( 'response' => 404 ) );
}
do_action( $hook, $wp_query->is_comment_feed );
}
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