Tag Cloud for ftp blogger blogs

In the sidebar section for Blogger template, include:

<h2 class="sidebar-title">Labels</h2>
<p><?php include($_SERVER['DOCUMENT_ROOT']."/labels.php"); ?></p>

The following is a modified version of tag cloud source I found.

<?php

define('PREFIX', 'labels/');  // for url
define('SEARCH_DIR', '/home/username/www/labels'); // server location of labels subdirectory

define('THIS_FILE', 'labels.php'); // name of labels file (this file)

if(file_exists(SEARCH_DIR.'_cloud_include_cache.php') &&
        filemtime(SEARCH_DIR.'_cloud_include_cache.php')>(time()-(60*60)))
{
    echo file_get_contents(SEARCH_DIR.'_cloud_include_cache.php');
}
else
{
    build_cloud();
}

/**
* build_cloud builds a tag cloud from the labels files.
* It actually uses labels file size to determine font size... which does
* not necessarily coincide with number of posts for a given label.
* 
* smallest file is assigned 100% font-size.  largest file - 200%
* everything else is proportional in between.
*/
function build_cloud()
{
    $output = '';
    $files = array();
    $dir = opendir(SEARCH_DIR);
    $low_end=PHP_INT_MAX;
    $high_end=0;
    while($file = readdir($dir))
    if($file != '.' && $file != '..' && $file != THIS_FILE && $file != CACHE_FILE)
    {
        $files[$file] = filesize(SEARCH_DIR."/".$file);
        $low_end = min($low_end, $files[$file]);
        $high_end = max($high_end, $files[$file]);
    }
    closedir($dir);
    ksort($files);
    foreach($files as $name=>$size)
    {
        $output .= "<a style=\"". get_style($low_end, $high_end, $size) . "\"".
        "href=\"".PREFIX.
        htmlentities($name)."\">".
        htmlentities(str_replace('.php','',$name))."</a> ";
    }
    echo $output;

    $fp = fopen(SEARCH_DIR.'_cloud_include_cache.html','w');
    fwrite($fp, $output);
    fclose($fp);
}
function get_style($low_end, $high_end, $size)
{
    $net = $high_end - $low_end;
    $font_size = (($size - $low_end) * 100) / $net + 100;

    if(!$interval) $interval++;

    return "font-size: ".$font_size."%;";
}
?>