<?php

      function xor_string($string)
      {
        /*  Returns $string xor'ed.
         *
         *  Written by Jeremy Brand <jeremy@nirvani.net>
         *  http://www.nirvani.net/software/
         *  http://www.jeremybrand.com/Jeremy/Brand/Jeremy_Brand.html
         * 
         *  I release this code under the public domain.  
         *  Version 1.0.0
         */
        $buf = '';
        $size = strlen($string);
        for ($i=0; $i<$size; $i++)
          $buf .= chr(ord($string[$i]) ^ 255);
        return $buf;
      }

?>