Making Participants Database list links to external sites open in a new tab

pdb_external_links.php

<?php

/**
 * Plugin Name: PDB External List Links
 * Description: makes Participants Database list links to external sites open in a new tab
 * Version: 2.0
 */

add_filter( 'pdb-before_display_form_element', 'xnau_alter_external_links', 10, 2 );

/**
 * adds a target=blank attribute to off-site links
 * 
 * @param string          $html    the HTML this will be an empty string at this point
 * @param PDb_Field_Item  $element the field data object
 *
 * @return string HTML or blank string to let the plugin create the display
 */
function xnau_alter_external_links( $html, $element )
{
 /*
  * we test for the link type field, and see that it has an URL in it
  */
 if ( $element->form_element() === 'link' ) {
  
  // if the link property is set to a URL
  if (  filter_var( $element->link, FILTER_VALIDATE_URL ) !== false ) {
 
   /*
    * now check to see that the URL does not point to our own site
    */
   if ( stripos( get_bloginfo('url'), parse_url( $element->link, PHP_URL_HOST ) ) === false ) {
    
     // set the target attribute
     $element->attributes['target'] = '_blank';
   }
  }
 }
  
 return $html;
}

Thank you. Really helped.

I had to update the plugin to work with the latest version of Participants Database