Something

				do
				{
					if($handle = opendir($base_path))
					{
						while(($file = readdir($handle)) !== FALSE)
						{
							if(is_dir($file))
							{
								// recursively delete from this dir.
							}
							else
							{
								// delete normal files.
							}
						}
						closedir($handle);
					}
				}
				while(is_dir($base_path));