Sows how to add a custom summary tag to a Participants Database log

pdb-custom-summary-tag.php

<?php
/**
 * Plugin Name: PDB Custom Summary Tag
 * Description: provides a custom tag to the "cars" log
 */

add_filter( 'pdblog-summary_tags', 'xnau_add_custom_summary_tag', 10, 2 );

/**
 * adds a custom summary tag to the "cars" log
 * 
 * @param array $tags
 * @param string $log_name
 */
function xnau_add_custom_summary_tag( $tags, $log_name )
{
  if ( $log_name === 'cars' ) 
  {
    $tags['average_score'] = $tags['sum'] / $tags['count'];
  }
  
  return $tags;
}

This filter adds an [average_score] tag that can be used in the summary template for the selected log.

This assumes that the log sum is configured as the sum of all scores. The tag makes it possible to display the average score in the summary display.