function for hash messages (usage for chats)

chunkMsg.php

<?

function chunkMsg($content){

                //coding message, this only will decode went the message is sended to recipient (execution time)

                $bytes = strlen($content);
                $chunks = $bytes/3;
                $part1 = str_replace("==", "", base64_encode(substr($content, 0, $chunks)));                
                $part2 = str_replace("==", "", base64_encode(substr($content, $chunks, $chunks * 2)));
                $part3 = str_replace("==", "", base64_encode(substr($content, ($chunks*2) + 1, $chunks * 3)));
                $salt = hash("sha1", md5(time()));


                $map = array(

                        "Q" => ":b:",
                        "A" => ":c:",
                        "D" => ":E:",
                        "f" => ":H:"

                        );

                foreach ($map as $k => $char) {

                   $part1 = str_replace($k, $char, $part1);
                   $part1 = str_replace($k, $char, $part2);
                   $part1 = str_replace($k, $char, $part3);

                        
                }


                $content = base64_encode("{$part1}|{$salt}|{$part2}|{$salt}|{$part3}");

                foreach ($map as $k => $char)
                   $content = str_replace($k, $char, $content);
              
                $msg = array();
                $offset = 8;
                $skip = 0;
                $bytes = strlen($content);


                for($i= 0; $i <  $bytes; $i = $i+8){        

                   $chunk = substr($content, $i, $offset);
                   $msg[] = $chunk;

                  }

         

                return $msg;


        }