code: private function handleHeader(&$delimiterFound, &$numBytes, &$tmp)
      {
          if ($tmp == "\r\n") {
              $numBytes = $this->adjustNumbytes($numBytes);
              $delimiterFound = true;
              $tmp = "";
              return;
          }
          
          if (substr($tmp, - 2, 2) == "\r\n") {
              $this->addParsedHeader($tmp);
              $tmp = "";
          }
      }
docs: Handle a header line
  
  All parameters by reference, which means the the values can be
  modified during execution of this method.
  
  @param boolean $delimiterFound
  Whether the delimiter for end of header section was found
  @param int $numBytes
  The number of bytes to read from remote
  @param string $tmp
  The current readen line