rewrite_rules_debug.php

<?php
/**
 * DEBUGGING
 *
 * Rewrite rules
 */

function dev4press_debug_rewrite_rules() {
  global $wp_rewrite;
  echo '<div>';
  if (!empty($wp_rewrite->rules)) {
    echo '<h1>Active Rewrite Rules</h1>';
    echo '<table><thead><tr style="text-align:left">';
    echo '<th>Rule</th><th>Rewrite</th>';
    echo '</tr></thead><tbody>';
    foreach ($wp_rewrite->rules as $name => $value) {
      echo '<tr><td>'.$name.'</td><td>'.$value.'</td></tr>';
    }
    echo '</tbody></table>';
  } else {
    echo 'No rules defined.';
  }
  echo '</div>';
}

function dev4press_debug_page_request() {
  global $wp, $template;

  if (!defined("D4P_EOL")) {
	define("D4P_EOL", "\n");
  }

  echo '<!-- Request: ';
  echo empty($wp->request) ? "None" : esc_html($wp->request);
  echo ' -->'.D4P_EOL;
  echo '<!-- Matched Rewrite Rule: ';
  echo empty($wp->matched_rule) ? "None" : esc_html($wp->matched_rule);
  echo ' -->'.D4P_EOL;
  echo '<!-- Matched Rewrite Query: ';
  echo empty($wp->matched_query) ? "None" : esc_html($wp->matched_query);
  echo ' -->'.D4P_EOL;
  echo '<!-- Loaded Template: ';
  echo basename($template);
  echo ' -->'.D4P_EOL;
}

add_action('wp', function() {
	dev4press_debug_page_request();
	dev4press_debug_rewrite_rules();
	die();
});