PHP Recursively Delete Directory

Hi,

I'm trying to write a PHP function which takes a directory path as a parameter, and then deletes all files and subdirectories. So far I have:

function delete_directory($dirname){
      if  (is_dir($dirname))
          chmod($dirname, 0755);    
            $dir_handle  =  opendir($dirname);
    if  (!$dir_handle)
        return  false;
    //while($file = readdir($dir_handle)){
    while (($file = readdir($dir_handle)) !== false){
        if  ($file  !=  "."  &&  $file  !=  "..")  {
            if  (is_dir($dirname."/".$file)){
                      delete_directory($dirname.'/'.$file);
            } else {
                  unlink($dirname."/".$file);
            }
        }
    }
    closedir($dir_handle);  
    rmdir($dirname);
}

But running this I get the warning:
"Warning: rmdir(C:/xampp/xampp/htdocs/temp) [function.rmdir]: Directory not empty"

When I view the file in Windows Explorer, the directory is empty (with show hidden/system files turned on!), and if I do "dir" from the command line, the only entries are "." and ".."

I'm a bit confused, becuase the directory does appear to be empty - any ideas?

Thanks