Sends the Participants Database welcome email when a record is approved

pdb-email_on_approval.php

<?php
/*
  Plugin Name: Participants Database Send Welcome On Approval
  Description: Sends the welcome email when a record is approved.
 */
/*
 * check the new record data before the record is updated
 */
add_filter( 'pdb-before_submit_update', 'pdb_send_record_update_notification' );

/**
 * sends an email notification when a record is approved
 * 
 * @param array $post the submitted record data
 * @return array the new record data
 */
function pdb_send_record_update_notification( $post )
{
  if ( ! is_admin() || empty( $post['email'] ) ) {
    /*
     * if we're not in the admin or if there is no email address to send to, do 
     * nothing and return
     */
    return $post;
  }
  /*
   * these three variables will need to be edited for your application
   */
  $subject = 'We approved your registration';
  $message = 'Dear [first_name] [last_name],
    Thanks for registering! You may <a href="[record_link]">access and update your record here.</a>';
  $from = 'Your Website <info@yourwebsite.com>';
  /*
   * put it all together into the configuration array
   */
  $config = array(
      'to' => $post['email'],
      'from' => $from,
      'subject' => $subject,
      'template' => $message,
  );
  // send the email if the record is getting approved
  if ( pdb_record_is_getting_approved( $post ) ) {
    PDb_Template_Email::send( $config, $post );
  }
  /*
   * return the record data so it can be saved
   */
  return $post;
}

function pdb_record_is_getting_approved( $new_record )
{
  $old_record = Participants_Db::get_participant( $new_record['id']);
  if ( $old_record['approved'] !== 'yes' && $new_record['approved'] === 'yes' ) {
    return true;
  }
  return false;
}