onmessage being called multiple times about phpwebsocket HOT 4 OPEN

So right now it sends a maximum of 32767 bytes in one call.  This would be 
fine, except that in the second call which would send the remaining bit of 
data, there are bytes missing as described here:

http://stackoverflow.com/questions/5857406/bytes-missing-between-websocket-calls

Related issue, when onmessage is being called multiple times, every call except 
the first has its first byte missing.  No idea how to fix.  Also don't know 
what the purpose of the following line of code is the unwrap():

return substr($msg,1,strlen($msg)-2);

Why is it shaving off two characters at the end? Shouldn't it just shave off 
the the chr(255)?

[deleted comment]

Hi, I encounter the same issue and simply solve it by change the unwrap 
function to this :

  function  unwrap($msg=""){
    $firstChar = substr($msg,0,1);
    $lastChar = substr($msg,-1);
    if ($firstChar==chr(0) && $lastChar==chr(255))
      return substr($msg,1,strlen($msg)-2);
    elseif ($firstChar==chr(0))
      return substr($msg,1);
    else
      return substr($msg,0,strlen($msg)-1);
  }

this function should delete the chr(0) in the head and the chr(255) in the 
tail, but when a message is divided into several pieces, chr(0) and chr(255) in 
fact are not exist in each fragment