<?php # copyright by fackelkind | codeMaster
    function getRecDirSize ($connection, $dir){
        $temp = ftp_rawlist ($connection, "-alR $dir");
        foreach ($temp as $file){
            if (ereg ("([-d][rwxst-]+).* ([0-9]) ([a-zA-Z0-9]+).* ([a-zA-Z0-9]+).* ([0-9]*) ([a-zA-Z]+[0-9: ]*[0-9]) ([0-9]{2}:[0-9]{2}) (.+)", $file, $regs)){ 
                $isdir = (substr ($regs[1],0,1) == "d");
                if (!$isdir)
                    $size += $regs[5];
            }
        }
        return $size;
    }
    $dirSize = getRecDirSize ($conID, "/");
?>

function getRecDirSize ($connection, $dir){
        $temp = ftp_rawlist ($connection, "-alR $dir");
        foreach ($temp as $file){
            if (ereg ("([-d][rwxst-]+).* ([0-9]) ([a-zA-Z0-9]+).* ([a-zA-Z0-9]+).* ([0-9]*) ([a-zA-Z]+[0-9: ]*[0-9]) ([0-9]{2}:[0-9]{2}) (.+)", $file, $regs)){
                $isdir = (substr ($regs[1],0,1) == "d");
                if (!$isdir)
                    $size += $regs[5];
            }
        }
        return $size;
    }

private function dirsize($dir) {
$size = 0;
if (is_dir($dir)) {
$objects = scandir($dir);
foreach ($objects as $object)
if ($object != "." && $object != ".." && $object != 'index.php')
if (filetype($dir."/".$object) == "dir")
$size += $this->dirsize($dir."/".$object);
else
$size += filesize($dir."/".$object);
reset($objects);
}
return $size;
}  

/**
 * Calculate the full size of a directory
 *
 * @author      Jonas John
 * @version     0.2
 * @link        http://www.jonasjohn.de/snippets/php/dir-size.htm
 * @param       string   $DirectoryPath    Directory path
 */
function CalcDirectorySize($DirectoryPath) {
 
    // I reccomend using a normalize_path function here
    // to make sure $DirectoryPath contains an ending slash
    // (-> http://www.jonasjohn.de/snippets/php/normalize-path.htm)
 
    // To display a good looking size you can use a readable_filesize
    // function.
    // (-> http://www.jonasjohn.de/snippets/php/readable-filesize.htm)
 
    $Size = 0;
 
    $Dir = opendir($DirectoryPath);
 
    if (!$Dir)
        return -1;
 
    while (($File = readdir($Dir)) !== false) {
 
        // Skip file pointers
        if ($File[0] == '.') continue; 
 
        // Go recursive down, or add the file size
        if (is_dir($DirectoryPath . $File))            
            $Size += CalcDirectorySize($DirectoryPath . $File . DIRECTORY_SEPARATOR);
        else 
            $Size += filesize($DirectoryPath . $File);        
    }
 
    closedir($Dir);
 
    return $Size;
}

/**
 * Return human readable sizes
 *
 * @author      Aidan Lister <aidan@php.net>
 * @version     1.3.0
 * @link        http://aidanlister.com/2004/04/human-readable-file-sizes/
 * @param       int     $size        size in bytes
 * @param       string  $max         maximum unit
 * @param       string  $system      'si' for SI, 'bi' for binary prefixes
 * @param       string  $retstring   return string format
 */
function size_readable($size, $max = null, $system = 'si', $retstring = '%01.2f %s')
{
    // Pick units
    $systems['si']['prefix'] = array('B', 'K', 'MB', 'GB', 'TB', 'PB');
    $systems['si']['size']   = 1000;
    $systems['bi']['prefix'] = array('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB');
    $systems['bi']['size']   = 1024;
    $sys = isset($systems[$system]) ? $systems[$system] : $systems['si'];
 
    // Max unit to display
    $depth = count($sys['prefix']) - 1;
    if ($max && false !== $d = array_search($max, $sys['prefix'])) {
        $depth = $d;
    }
 
    // Loop
    $i = 0;
    while ($size >= $sys['size'] && $i < $depth) {
        $size /= $sys['size'];
        $i++;
    }
 
    return sprintf($retstring, $size, $sys['prefix'][$i]);
}