Demonstrates how to show decimal numbers using comma as the separator

pdb-comma-decimal-display.php

<?php
/**
 * Plugin Name: PDB Comma Decimal Separator Display
 * Description: alters the display of decimal numbers to use comma as the decimal separator, and point as the thousands separator
 */
add_filter('pdb-before_display_form_element', 'xnau_show_comma_decimals', 10, 2 );
function xnau_show_comma_decimals( $display, $field )
{
  // we are only modifying these form element types
  if ( $field->form_element === 'decimal' || $field->form_element === 'currency' ) {
    
    // count the number of decimal digits in the number
    $decimals = strlen( strstr( $field->value, '.' ) ) -1;
    
    // this function formats the number using comma for the decimal separator and dot for the thousands separator
    $display = number_format( $field->value, $decimals, ',', '.' );
    
  }
  return $display;
}