[Jordan]

I've added comments around what I added:

PHP Code:

<?php 

// Add a variable before the loops
$totalSize = 0;

$dir = "../demo/themes/"; 
        $tree = array(); 
        $dirs = array(array($dir, &$tree)); 
        
        for($i = 0; $i < count($dirs); ++$i) 
        { 
                $d = opendir($dirs[$i][0]); 
                $tier =& $dirs[$i][1]; 

                while($file = readdir($d)) 
                { 
                        if ($file != '.' and $file != '..') 
                        { 
                                $path = $dirs[$i][0] . DIRECTORY_SEPARATOR . $file; 
                                if (is_dir($path)) 
                                { 
                                        $tier[$file] = array(); 
                                        $dirs[] = array($path, &$tier[$file]); 
                                } 
                                else 
                                { 
                                         
                                    $size2 = filesize($path); 
                                    
                                    // Add the Size
                                    $totalSize += size2;

                                    $size = array($size2); 
                                    print_r($size); 
                                    echo "<br>";     
                                         
                                }     
                                                                                  
                        } 
                         
                } 
                 
        } 

  // Show the size
  print $totalSize;

Also, if you are using an array you should push the value so that it goes in as the last/new element. That would keep them from all being on element 0.