Demonstrates how to enact a conditional redirect based on the submitted data from a Participants Database signup form

pdb-signup-redirect-filter.php

<?php
// place the filter on the posted data before it is submitted
add_filter( 'pdb-before_submit_signup', 'xnau_conditional_signup_redirect' );
/**
 * changes the signup form "thanks" page depending on a value in the form
 *
 * @param array $post the posted data
 * @return array post data
 */
function xnau_conditional_signup_redirect( $post )
{
  switch( $post['signup_type'] ) { // the "signup_type" value tells us which thanks page to use
    case 'volunteer':
      $thankspage = 'volunteer-thanks';
      break;
    case 'contributor':
    default:
      $thankspage = 'contributor-thanks';
      break;
  }
  $post['thanks_page'] = Participants_Db::find_permalink( $thankspage );
  
  // now return the altered post data
  $return $post;
}

The signup thanks message will be the same in both cases, so you can either blank it out and just have the page content show, or you can use the 'pdb-before_signup_thanks' filter to set up your dynamic thank you message.