//debug rewrite
function debug_rewrite() {
	global $wp, $wp_rewrite;
 
	if ( !current_user_can( 'manage_options' ) )
		return;
 
	echo "< pre>";
	var_dump( $wp->matched_rule );
	print_r( $wp_rewrite );
	echo "< \/pre>";
}
add_action( 'template_redirect', 'debug_rewrite' );

function dev4press_debug_rewrite_rules() {
  global $wp_rewrite;
  echo '<div>';
  if (!empty($wp_rewrite->rules)) {
    echo '<h5>Rewrite Rules</h5>';
    echo '<table><thead><tr>';
    echo '<td>Rule</td><td>Rewrite</td>';
    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>';
}
//

dev4press_debug_rewrite_rules();

//debug
function dev4press_debug_page_request() {
  global $wp, $template;
  define("D4P_EOL", "rn");
 
  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;
}

ini_set( 'error_reporting', -1 );
ini_set( 'display_errors', 'On' );
 
echo '< pre>';
 
add_action( 'parse_request', 'debug_404_rewrite_dump' );
function debug_404_rewrite_dump( &$wp ) {
    global $wp_rewrite;
 
    echo '<h2>rewrite rules</h2>';
    echo var_export( $wp_rewrite->wp_rewrite_rules(), true );
 
    echo '<h2>permalink structure</h2>';
    echo var_export( $wp_rewrite->permalink_structure, true );
 
    echo '<h2>page permastruct</h2>';
    echo var_export( $wp_rewrite->get_page_permastruct(), true );
 
    echo '<h2>matched rule and query</h2>';
    echo var_export( $wp->matched_rule, true );
 
    echo '<h2>matched query</h2>';
    echo var_export( $wp->matched_query, true );
 
    echo '<h2>request</h2>';
    echo var_export( $wp->request, true );
 
    global $wp_the_query;
    echo '<h2>the query</h2>';
    echo var_export( $wp_the_query, true );
}
add_action( 'template_redirect', 'debug_404_template_redirect', 99999 );
function debug_404_template_redirect() {
    global $wp_filter;
    echo '<h2>template redirect filters</h2>';
    echo var_export( $wp_filter[current_filter()], true );
}
add_filter ( 'template_include', 'debug_404_template_dump' );
function debug_404_template_dump( $template ) { 
    echo '<h2>template file selected</h2>';
    echo var_export( $template, true );
 
    echo '< \/pre>';
    exit();
}
//or call this
function dev4press_debug_page_request() {
  global $wp, $template;
  define("D4P_EOL", "rn");
 
  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;
}