add_feed( string $feedname, callable $callback ): string

User Contributed Notes

1. Skip to note 5 content

   Steven Word 8 years ago

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   When a new custom feed is added, the endpoint will render using a `Content-Type: application/octet-stream; charset=UTF-8` by default. It would be useful to document working with content types in combination with add_feed() .

   For example either:

   function add_custom_feed() {
   	add_feed( 'custom', 'render_custom_feed' );
   }
   add_action( 'init', 'add_custom_feed' );
   
   function render_custom_feed() {
   	header( 'Content-Type: application/rss+xml' );
   	echo 'aye!';
   }

   or:

   function add_custom_feed() {
   	add_feed( 'custom', 'render_custom_feed' );
   }
   add_action( 'init', 'add_custom_feed' );
   
   
   function custom_feed_content_type( $content_type, $type ) {
   	if( 'custom' == $type ) {
   		$content_type = 'application/rss+xml';
   	}
   	return $content_type;
   }
   add_filter( 'feed_content_type', 'custom_feed_content_type', 10, 2 );
   
   function render_custom_feed() {
   	echo 'aye!';
   }

   will work.

   See: https://core.trac.wordpress.org/ticket/36334
2. Skip to note 6 content

   MakeWebBetter 4 years ago

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   Usage of add_feed()

   function wpdocs_add_mwb_feed() {
       add_feed( 'mwbfeed', 'wpdocs_makewebbetter_feed' );
   }
   add_action( 'init', 'wpdocs_add_mwb_feed' );
   
   function wpdocs_makewebbetter_feed() {
       add_filter( 'pre_option_rss_use_excerpt', '__return_zero' );
       load_template( PATHTEMPLATEFILE . '/feeds/a-feed-template.php' );
   }
3. Skip to note 7 content

   Michael Revellin-Clerc 4 years ago

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   RSS Feed based on custom WP Query with parameters

   add_action( 'init', 'wpdocs_custom_feed_rss2' );
   function wpdocs_custom_feed_rss2() {
   
       // Create your feed name like this : https://yoursite.com/wpdocs_custom?tag=test
       add_feed( 'wpdocs_custom', 'wpdocs_change_main_query' );
       function wpdocs_change_main_query() {
   
           // Set right headers for RSS Feed
           header( 'Content-Type: application/rss+xml' );
   
           // Get main WP Query
           global $wp_query;
   
           // Get parameters in url
           if ( ! empty( $_GET['tag'] ) ) :
               $tag = $_GET['tag'];
           endif;
   
           // Overwrite main WP Query with yours
           $wp_query = new WP_Query(
               array(
                   'post_type' => 'any',
                   'fields'    => 'ids',
                   'tag'       => $tag,
               )
           );
   
           // Use the basic template to load your custom RSS Feed
           get_template_part( 'feed', 'rss2' );
       }
   }
4. Skip to note 8 content

   Narendra Sishodiya 4 months ago

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   The Feed name Parameters $feedname(required) should not start with `_` if it start with this then we will recieve the wp_die error message.

   function feed2_callback( $is_comment_feed, $feed ) {
   	header( 'Content-Type: application/xml; charset=UTF-8', true );
   	echo '';
   ?>
   
   	Test
   
   <?php
   }
   
   add_feed( '_feed2', 'feed2_callback' );

   Next, update the rewrite rule and access http://localhost/_feed2, which will return wp_die with 404 status.

   This is not a problem with the code I tried, but because the “_” at the beginning of the feed name is removed in the do_feed function.

   function do_feed() {
   	global $wp_query;
   
   	$feed = get_query_var( 'feed' );
   
   	// Remove the pad, if present.
   	$feed = preg_replace( '/^_+/', '', $feed );

   This process results in an action name of 'do_feed_' . 'feed2' when $feed is '_feed2'.

   Since this is not done in the add_feed function and the action name specified in the add_action function is 'do_feed_' . '_feed2', since the two action names do not match, which resulting in the error indicated in the response.