Cleaning up the WordPress Feed (Validation)

When using your main content feed to share posts via buffer or other services, it is crucial that your feed validates cleanly.

There are always things in the generated WordPress content that can break your feed validation. Here some things to cleanup or alter your delivered feed content.

CONDITIONAL TAGS

is_feed()
Check for syndication request. This tag is not typically used by users; it is used internally by WordPress and is available for Plugin Developers.

Check for feed syndication in your themes functions.php

if (is_feed()) {

    /.. tweaks go here ../

}

REMOVE IFRAMES

function rss_noiframe($content) {

        
    $content = preg_replace( '/<iframe(.*)\/iframe>/is', '', $content );

 
    return $content;

}
 
add_filter('the_excerpt_rss', 'rss_noiframe');

add_filter('the_content_feed', 'rss_noiframe');

REMOVE / DISABLE COMMENTS

function rss_nocomments($content) {

    
     global $post;

      $post->comment_status="closed";

   
  
}
 
add_filter('the_excerpt_rss', 'rss_nocomments');

add_filter('the_content_feed', 'rss_nocomments');

REMOVE RESPONSIVE IMAGES

The sizes attribute breaks feed validation, here how to clean it up.

function no_responsive_image_feeds() {

    add_filter( 'max_srcset_image_width', function() {

       return 1;

    } );

}
 
add_action('rss2_head', 'no_responsive_image_feeds' );

add_action('atom_head', 'no_responsive_image_feeds' );

add_action('rss_head', 'no_responsive_image_feeds' );

INCLUDE PAGES IN POST FEED

if (is_feed()) {


function feedFilter($query) {

        if ($query->is_feed) {

                $query->set('post_type','any');

                }

        return $query;

}
add_filter('pre_get_posts','feedFilter');

}

ADJUST AMOUNT OF POSTS

if (is_feed()) {

 

function feedFilter($query) {

        if ($query->is_feed) {

                $query->set('posts_per_page','11');

        }

 
        return $query;

}
add_filter('pre_get_posts','feedFilter');

 
}

LIMIT BY CATEGORY

if (is_feed()) {


function feedFilter($query) {

        if ($query->is_feed) {

                $query->set('category_name', 'my-special-cat');

        }

 
        return $query;

}
add_filter('pre_get_posts','feedFilter');

}

Enjoy coding …