sp;           case -3:
                                return("-3 socket could not be created");
                        case -4:
                                return("-4 dns lookup on hostname "$hostname" failed");
                        case -5:
                                return("-5 connection refused or timed out");
                        case -6:
                                return("-6 fdopen() call failed");
                        case -7:
                                return("-7 setvbuf() call failed");
                        default:
                                return("");
                }
        }

        Function CloseConnection()
        {
                if($this->connection!=0)
                {
                        fclose($this->connection);
                        $this->connection=0;
                }
        }

        Function Open()
        {
                if($this->state!="DISCONNECTED")
                        return("1 a connection is already opened");
                if(($error=$this->OpenConnection())!="")
                        return($error);
                $this->greeting=$this->GetLine();
                if(GetType($this->greeting)!="string"
                || strtok($this->greeting," ")!="+OK")
                {
                        $this->CloseConnection();
                        return("3 POP3 server greeting was not found");
                }
                $this->greeting=strtok(" ");
                $this->must_update=0;
                $this->state="AUTHORIZATION";
                return("");
        }
        
        Function Close()
        {
                if($this->state=="DISCONNECTED")
                        return("no connection was opened");
                if($this->must_update)
                {
                        if($this->PutLine("QUIT")==0)
                                return("Could not send the QUIT command");
                        $response=$this->GetLine();
                        if(GetType($response)!="string")
                                return("Could not get quit command response");
                        if(strtok($response," ")!="+OK")
                                return("Could not quit the connection: ".strtok(" "));
                }
                $this->CloseConnection();
                $this->state="DISCONNECTED";
                return("");
        }

        Function Login($user,$password,$apop)
        {
                if($this->state!="AUTHORIZATION")
                        return("connection is not in AUTHORIZATION state");
                if($apop)
                {
                        if($this->PutLine("APOP $user ".md5($this->greeting.$password))==0)
                                return("Could not send the APOP command");
                        $response=$this->GetLine();
           &nbs

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