Plugin für Verbindung mit forum?

<?php
/**
 * Server-side rendering of the `core/rss` block.
 *
 * @package WordPress
 */


/**
 * Renders the `core/rss` block on server.
 *
 * @param array $attributes The block attributes.
 *
 * @return string Returns the block content with received rss items.
 */
function render_block_core_rss( $attributes ) {
   $rss = fetch_feed( $attributes['feedURL'] );


   if ( is_wp_error( $rss ) ) {
       return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . $rss->get_error_message() . '</div></div>';
   }


   if ( ! $rss->get_item_quantity() ) {
       // PHP 5.2 compatibility. See: http://simplepie.org/wiki/faq/i_m_getting_memory_leaks.
       $rss->__destruct();
       unset( $rss );


       return '<div class="components-placeholder"><div class="notice notice-error">' . __( 'An error has occurred, which probably means the feed is down. Try again later.' ) . '</div></div>';
   }


   $rss_items  = $rss->get_items( 0, $attributes['itemsToShow'] );
   $list_items = '';
   foreach ( $rss_items as $item ) {
       $title = esc_html( trim( strip_tags( $item->get_title() ) ) );
       if ( empty( $title ) ) {
           $title = __( '(no title)' );
       }
       $link = $item->get_link();
       $link = esc_url( $link );
       if ( $link ) {
           $title = "<a href='{$link}'>{$title}</a>";
       }
       $title = "<div class='wp-block-rss__item-title'>{$title}</div>";


       $date = '';
       if ( $attributes['displayDate'] ) {
           $date = $item->get_date( 'U' );


           if ( $date ) {
               $date = sprintf(
                   '<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',
                   date_i18n( get_option( 'c' ), $date ),
                   date_i18n( get_option( 'date_format' ), $date )
               );
           }
       }


       $author = '';
       if ( $attributes['displayAuthor'] ) {
           $author = $item->get_author();
           if ( is_object( $author ) ) {
               $author = $author->get_name();
               $author = '<span class="wp-block-rss__item-author">' . __( 'by' ) . ' ' . esc_html( strip_tags( $author ) ) . '</span>';
           }
       }


       $excerpt = '';
       if ( $attributes['displayExcerpt'] ) {
           $excerpt = html_entity_decode( $item->get_description(), ENT_QUOTES, get_option( 'blog_charset' ) );
           $excerpt = esc_attr( wp_trim_words( $excerpt, $attributes['excerptLength'], ' [&hellip;]' ) );


           // Change existing [...] to [&hellip;].
           if ( '[...]' === substr( $excerpt, -5 ) ) {
               $excerpt = substr( $excerpt, 0, -5 ) . '[&hellip;]';
           }


           $excerpt = '<div class="wp-block-rss__item-excerpt">' . esc_html( $excerpt ) . '</div>';
       }


       $list_items .= "<li class='wp-block-rss__item'>{$title}{$date}{$author}{$excerpt}</li>";
   }


   $class = 'wp-block-rss';
   if ( isset( $attributes['align'] ) ) {
       $class .= ' align' . $attributes['align'];
   }


   if ( isset( $attributes['blockLayout'] ) && 'grid' === $attributes['blockLayout'] ) {
       $class .= ' is-grid';
   }


   if ( isset( $attributes['columns'] ) && 'grid' === $attributes['blockLayout'] ) {
       $class .= ' columns-' . $attributes['columns'];
   }


   if ( isset( $attributes['className'] ) ) {
       $class .= ' ' . $attributes['className'];
   }


   $list_items_markup = "<ul class='{$class}'>{$list_items}</ul>";


   // PHP 5.2 compatibility. See: http://simplepie.org/wiki/faq/i_m_getting_memory_leaks.
   $rss->__destruct();
   unset( $rss );


   return $list_items_markup;
}


/**
 * Registers the `core/rss` block on server.
 */
function register_block_core_rss() {
   register_block_type(
       'core/rss',
       array(
           'attributes'      => array(
               'align'          => array(
                   'type' => 'string',
                   'enum' => array( 'left', 'center', 'right', 'wide', 'full' ),
               ),
               'className'      => array(
                   'type' => 'string',
               ),
               'columns'        => array(
                   'type'    => 'number',
                   'default' => 2,
               ),
               'blockLayout'    => array(
                   'type'    => 'string',
                   'default' => 'list',
               ),
               'feedURL'        => array(
                   'type'    => 'string',
                   'default' => '',
               ),
               'itemsToShow'    => array(
                   'type'    => 'number',
                   'default' => 5,
               ),
               'displayExcerpt' => array(
                   'type'    => 'boolean',
                   'default' => false,
               ),
               'displayAuthor'  => array(
                   'type'    => 'boolean',
                   'default' => false,
               ),
               'displayDate'    => array(
                   'type'    => 'boolean',
                   'default' => false,
               ),
               'excerptLength'  => array(
                   'type'    => 'number',
                   'default' => 55,
               ),
           ),
           'render_callback' => 'render_block_core_rss',
       )
   );
}
add_action( 'init', 'register_block_core_rss' );