/**
	* Encodes an email address in multiple ways.
	* @param $str String The email address to encode.
	* @version $url_encode bool Should we use url encoding? Do not use this for displaying, only for mailto: links.
	*/
	public function encode_email_address($str, $url_encode = true)
	{
		if (empty($str))
			return;
 
		$strlength = strlen($str);
		$ret = '';
		for($index = 0; $index < $strlength; $index++)
		{
			$type = rand(1, $url_encode ? 4 : 3);
			$char = $str[$index];
			switch($type)
			{
				case 1: $ret .= '&#' . ord($char) . ';';  break;
				case 2: $ret .= '&#x' . dechex(ord($char)) . ';'; break;
				case 3: $ret .= $char; break;
				case 4: $ret .= '%' . bin2hex($char); break;
			}
		}
		return $ret;
	}