Binary translator šifrace textu PHP

<?php

class BinaryTranslator
{
        public function toBinary($string)
        {
                $binary = "";

                $space = " ";

                for ($i = 0; $i < mb_strlen($string); $i++)
                {
                        if ($i == (mb_strlen($string) - 1))
                                $space = "";
                        $binary .= decbin(ord(mb_strtolower($string[$i]))) . $space;
                }

                return $binary;
        }

        public function fromBinary($binary)
        {
                $bin_arr = explode(" ", $binary);

                $string = "";

                foreach ($bin_arr as $bin)
                        $string .= chr(bindec((int)$bin));

                return $string;
        }

}