php用 fsockopen smtp 发邮件遇到个问题

 $fp  =  fsockopen ( $smtp ,  $port ,  $errno ,  $errstr ,  30 );

        if (! $fp ) {

            echo  " $errstr  ( $errno )<br />\n" ;

        } else {

             

            $re =  fgets ( $fp ,  256 );

            $re_arr = explode(" ",$re);

            //print_r($re_arr);

            if ($re_arr[0]!=220) {

                $state['state']=0;

                $state['info'] ="连接到邮件服务器失败";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }



           

            //send HELO sb

            fwrite ( $fp ,  "HELO sb\r\n" );

            $re =  fgets ( $fp ,  256 );

            $re_arr = explode(" ",$re);

            if ($re_arr[0]!=250) {

                $state['state']=0;

                $state['info'] ="邮件服务器无响应";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }



           

            fwrite ( $fp ,  "auth login\r\n" );

            $re =  fgets ( $fp ,  256 );

            $re_arr = explode(" ",$re);

            if ($re_arr[0]!=334) {

                $state['state']=0;

                $state['info'] ="邮件服务器拒绝登录";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }

  



            //发送用户名

            fwrite ( $fp ,  base64_encode($email_user)."\r\n" );

            $re =  fgets ( $fp ,  256 );

            // 这里遇到个问题 这个$re 有时返回是空的 没有任何内容

            $re_arr = explode(" ",$re);

            if ($re_arr[0]!=334) {

                $state['state']=0;

                $state['info'] ="用户名验证失败";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }



            //发送密码

            fwrite ( $fp ,  base64_encode($password)."\r\n" );

            $re =  fgets ( $fp ,  256 );

            $re_arr = explode(" ",$re);

            if ($re_arr[0]!=235) {

                $state['state']=0;

                if ($re_arr[0]=="454") {

                    $state['info'] ="请开启smtp";

                }else{

                    $state['info'] ="用户名或密码验证失败";

                }



                fclose ( $fp );

                print_r($re_arr);

                print_r($state);

                exit();

                return $state;



            }



            //mail from:<xxx@qq.com>

            fwrite ( $fp ,  "mail from:<".$email.">\r\n" );

            $re =  fgets ( $fp ,  256 );

            $re_arr = explode(" ",$re);

            if ($re_arr[0]!=250) {

                $state['state']=0;

                $state['info'] ="mail from 消息验证失败";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }



            //rcpt to:<xxx@qq.com>

            fwrite ( $fp ,  "rcpt to:<".$to.">\r\n" );

            $re =  fgets ( $fp ,  256 );

            $re_arr = explode(" ",$re);

            if ($re_arr[0]!=250) {

                $state['state']=0;

                $state['info'] ="rcpt to 消息验证失败";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }



            //data 命令

            fwrite ( $fp ,  "data\r\n" );

            $re =  fgets ( $fp ,  256 );

            $re_arr = explode(" ",$re);

            if ($re_arr[0]!=354) {

                $state['state']=0;

                $state['info'] ="邮件服务器拒绝";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }



            // 发送数据

            fwrite ( $fp ,  $mail_body );

            $re =  fgets ( $fp ,  256 );

            $re_arr = explode(" ",$re);

            if ($re_arr[0]!=250) {

                $state['state']=0;

                $state['info'] ="邮件发送失败";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }else{

                $state['state']=1;

                $state['info'] ="邮件发送成功";

                fclose ( $fp );

                print_r($state);

                exit();

                return $state;



            }