รบกวนช่วยดู code php ที่ telnet ไปยัง switch มีปัญหาด้านคำสั่งใน switch

/////////////////////////////////////อันนี้คือหน้าคำสั่ง telnet.php///////////////////////////////////////
<?php
require_once "PHPTelnet.php";

$telnet = new PHPTelnet();

// if the first argument to Connect is blank,
// PHPTelnet will connect to the local host via 127.0.0.1
$result = $telnet->Connect('เลขไอพี',ยูสเซอร์,'พาสเวิด');

switch ($result) {

//////////////////////////////////////มีปัญหาตรงนี้////////////////////////////////
case 0:
$telnet->DoCommand('cc sw 1', $result);
// NOTE: $result may contain newlines
echo $result;
$result->DoCommand('TEMPerature', $result);
echo $result;
// say Disconnect(0); to break the connection without explicitly logging out
$telnet->Disconnect();
break;
//////////////////////////////////////////////////////////////////////////////////////////



case 1:
echo '[PHP Telnet] Connect failed: Unable to open network connection';
break;
case 2:
echo '[PHP Telnet] Connect failed: Unknown host';
break;
case 3:
echo '[PHP Telnet] Connect failed: Login failed';
break;
case 4:
echo '[PHP Telnet] Connect failed: Your PHP version does not support PHP Telnet';
break;
}
?>

<?php
/*
PHPTelnet 1.0
by Antone Roundy
adapted from code found on the PHP website
public domain
*/

class PHPTelnet {
   var $use_usleep=0;   // change to 1 for faster execution
      // don't change to 1 on Windows servers unless you have PHP 5
   var $sleeptime=125000;
   var $loginsleeptime=1000000;

   var $fp=NULL;
   var $loginprompt;

   /*
   0 = success
   1 = couldn't open network connection
   2 = unknown host
   3 = login failed
   4 = PHP version too low
   */
   function Connect($server,$user,$pass) {
      $rv=0;
      $vers=explode('.',PHP_VERSION);
      $needvers=array(4,3,0);
      $j=count($vers);
      $k=count($needvers);
      if ($k<$j) $j=$k;
      for ($i=0;$i<$j;$i++) {
         if (($vers[$i]+0)>$needvers[$i]) break;
         if (($vers[$i]+0)<$needvers[$i]) return 4;
      }
      
      $this->Disconnect();
      
      if (strlen($server)) {
         if (preg_match('/[^0-9.]/',$server)) {
            $ip=gethostbyname($server);
            if ($ip==$server) {
               $ip='';
               $rv=2;
            }
         } else $ip=$server;
      } else $ip='127.0.0.1';
      
      if (strlen($ip)) {
         if ($this->fp=fsockopen($ip,5555)) {
            fputs($this->fp,chr(0xFF).chr(0xFB).chr(0x1F).chr(0xFF).chr(0xFB).
            chr(0x20).chr(0xFF).chr(0xFB).chr(0x18).chr(0xFF).chr(0xFB).
            chr(0x27).chr(0xFF).chr(0xFD).chr(0x01).chr(0xFF).chr(0xFB).
            chr(0x03).chr(0xFF).chr(0xFD).chr(0x03).chr(0xFF).chr(0xFC).
            chr(0x23).chr(0xFF).chr(0xFC).chr(0x24).chr(0xFF).chr(0xFA).
            chr(0x1F).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xFF).
            chr(0xF0).chr(0xFF).chr(0xFA).chr(0x20).chr(0x00).chr(0x33).
            chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2C).chr(0x33).
            chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xFF).chr(0xF0).
            chr(0xFF).chr(0xFA).chr(0x27).chr(0x00).chr(0xFF).chr(0xF0).
            chr(0xFF).chr(0xFA).chr(0x18).chr(0x00).chr(0x58).chr(0x54).
            chr(0x45).chr(0x52).chr(0x4D).chr(0xFF).chr(0xF0));
            if ($this->use_usleep) usleep($this->sleeptime);
            else sleep(1);
            
            fputs($this->fp,chr(0xFF).chr(0xFC).chr(0x01).chr(0xFF).chr(0xFC).
            chr(0x22).chr(0xFF).chr(0xFE).chr(0x05).chr(0xFF).chr(0xFC).chr(0x21));
            if ($this->use_usleep) usleep($this->sleeptime);
            else sleep(1);
            $this->GetResponse($r);
            $r=explode("\n",$r);
            $this->loginprompt=$r[count($r)-1];

            fputs($this->fp,"$user\r");
            if ($this->use_usleep) usleep($this->sleeptime);
            else sleep(1);

            fputs($this->fp,"$pass\r");
            if ($this->use_usleep) usleep($this->loginsleeptime);
            else sleep(1);
            $this->GetResponse($r);
            $r=explode("\n",$r);
            if (($r[count($r)-1]=='')||($this->loginprompt==$r[count($r)-1])) {
               $rv=3;
               $this->Disconnect();
            }
         } else $rv=1;
      }
      
      return $rv;
   }
   
   function Disconnect($exit=1) {
      if ($this->fp) {
         if ($exit) $this->DoCommand('exit',$junk);
         fclose($this->fp);
         $this->fp=NULL;
      }
   }

   function DoCommand($c,&$r) {
      if ($this->fp) {
         fputs($this->fp,"$c\r");
         if ($this->use_usleep) usleep($this->sleeptime);
         else sleep(1);
         $this->GetResponse($r);
         $r=preg_replace("/^.*?\n(.*)\n[^\n]*$/","$1",$r);
      }
      return $this->fp?1:0;
   }
   
   function GetResponse(&$r) {
      $r='';
      do { 
         $r.=fread($this->fp,1000);
         $s=socket_get_status($this->fp);
      } while ($s['unread_bytes']);
   }
}
?>