WordPress - list all action hooks registered

php-wp-list-hooks.php

<?php
// http://www.wprecipes.com/list-all-hooked-wordpress-functions
function list_hooked_functions($tag=false){
 global $wp_filter;
 if ($tag) {
  $hook[$tag]=$wp_filter[$tag];
  if (!is_array($hook[$tag])) {
  trigger_error("Nothing found for '$tag' hook", E_USER_WARNING);
  return;
  }
 }
 else {
  $hook=$wp_filter;
  ksort($hook);
 }
 echo '<pre>';
 foreach($hook as $tag => $priority){
  echo "<br />&gt;&gt;&gt;&gt;&gt;\t<strong>$tag</strong><br />";
  ksort($priority);
  foreach($priority as $priority => $function){
  echo $priority;
  foreach($function as $name => $properties) echo "\t$name<br />";
  }
 }
 echo '</pre>';
 return;
}