link the title to the original article and open them in new window.

feedzy-link-post-title-to-original-article.php

<?php
/**
 * Plugin Name: Feedzy posts - link the title to the original article and open them in new window
 * Description: Link the title of posts imported by Feedzy to the original article
 * Version: 1.0
 * Author: Themeisle
 * Author URI: https://themeisle.com
 */

/**
 * Filters the permalink for a post and custom post type.
 *
 * @param string $url Post link.
 * @param object $post Post Object.
 * @return string
 */
 
function feedzy_get_filtered_url( $post ) {
  if ( is_admin() ) {
    return false;
  }

  $current_post_meta = get_post_meta( $post->ID, 'feedzy_item_url', true );

  if ( ! empty( $current_post_meta ) ) {
    return $current_post_meta;
  }

  return get_permalink( $post );
}

function feedzy_rss_modify_post_links( $title, $id = null ) {
  if ( is_admin() || !$id ) {
    return $title;
  }

  $post = get_post( $id );
  $url = feedzy_get_filtered_url( $post );

  if ( ! empty( $url ) ) {
    return '<a href="' . esc_url( $url ) . '" target="_blank">' . $title . '</a>';
  }

  return $title;
}
add_filter( 'the_title', 'feedzy_rss_modify_post_links', 10, 2 );

function feedzy_rss_modify_thumbnail_html( $html, $post_id, $post_thumbnail_id, $size, $attr ) {
  if ( is_admin() ) {
    return $html;
  }

  $post = get_post( $post_id );
  $url = feedzy_get_filtered_url( $post );

  if ( ! empty( $url ) ) {
    return '<a href="' . esc_url( $url ) . '" target="_blank">' . $html . '</a>';
  }

  return $html;
}
add_filter( 'post_thumbnail_html', 'feedzy_rss_modify_thumbnail_html', 10, 5 );