Wordpress list hooked functions

functions.php

<?php
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;
}

if (isset($_GET['debug'])) {
    list_hooked_functions();
}