关键时刻还得google来解决问题……

    <?php

    $router_ip = '';
    $username = '';
    $password = '';
    $port = 23;
    $timeout = 10;

    $connection = fsockopen($router_ip, $port, $errno, $errstr, $timeout);

    if(!$connection){
     echo "Connection failed\n";
     exit();
    } else {

     fputs($connection, "$username\r\n");
     fputs($connection, "$password\r\n");
     fputs($connection, "cd setup/dhcp/dhcp-table \r\n");
     fputs($connection, "dir \r\n");
     fputs($connection, " ");

     $j = 0;
     while ($j < 16) {
      fgets($connection);
      $j++;
     }
     stream_set_timeout($connection, 2);
     $timeoutCount = 0;
     $content ='';
     $DhcpArray = '';
     (int) $index =0;

    $DhcpFile = "C:\IP-Symcon\webfront\user\images\LancomDhcp.txt";
    $fh = fopen($DhcpFile, 'w') or die("can't open file");

    //$DhcpArray[0] = array ('IP-Address', 'MAC-Address', 'Timeout', 'Hostname', 'Type', 'LAN-Ifc', 'Ethernet-Port', 'VLAN-ID', 'Network-Name');

     while (!feof($connection)){

      $content = fgets($connection);
      $content = str_replace("\r", '', $content);
      $content = str_replace("\n", "", $content);
      $lineArray = explode(' ', $content);
      if (isValidIp($lineArray [0]))
          {
          $DhcpArray[$index]['IP-Address'] = substr ($content, 0,17);
          $DhcpArray[$index]['MAC-Address'] = substr ($content, 17,32-18);
          $DhcpArray[$index]['Timeout'] = substr ($content, 31,41-32);
          $DhcpArray[$index]['Hostname'] = substr ($content, 40,108-41);
          $DhcpArray[$index]['Type'] = substr ($content, 107,125-108);
          $DhcpArray[$index]['LAN-Ifc'] = substr ($content, 124,137-125);
          $DhcpArray[$index]['Ethernet-Port'] = substr ($content, 136,152-137);
          $DhcpArray[$index]['VLAN-ID'] = substr ($content, 151,161-152);
          $DhcpArray[$index]['Network-Name'] = substr ($content, 160);
          fwrite($fh, $content);
          $index +=1;
          }

      # If the router say "press space for more", send space char:
      if (preg_match('/MORE/', $content) ){ // IF current line contain --More-- expression,
       fputs ($connection, " "); // sending space char for next part of output.
      } # The "more" controlling part complated.

      $info = stream_get_meta_data($connection);
      if ($info['timed_out']) { // If timeout of connection info has got a value, the router not returning a output.
       $timeoutCount++; // We want to count, how many times repeating.
      }
      if ($timeoutCount >2){ // If repeating more than 2 times,
       break;   // the connection terminating..
      }
     }
     $content = substr($content,410);

     BetterTable($DhcpArray);




    fclose($fh);

    }
    echo "End.\r\n";

    //--------------------------------------------------------------------

    function isValidIp($ip)
    {/* PCRE Pattern written by Junaid Atari */
        return !preg_match ( '/^([1-9]\d|1\d{0,2}|2[0-5]{2})\.('.
                             '(0|1?\d{0,2}|2[0-5]{2})\.){2}(0|1?'.
                             '\d{0,2}|2[0-5]{2})(\:\d{2,4})?$/',
                             (string) $ip )
                ? false
                : true;
    }

    //--------------------------------------------------------------

    function BetterTable($twoDimArray)
    {
    $i = 0;
    echo "<table>
            <table class='BetterTable' border='1'>";

    echo "<tr>";
    echo '<td>Line #
    </td>';
    foreach ($twoDimArray[0] as  $fieldName => $fieldValue)
        {
            echo '<td>'.$fieldName. '</td>';
        }echo '</tr>';
    $i = 0;

    foreach ($twoDimArray as $rowName => $rowValue)
    {
            if ($i%2 == 0)
                Echo "<tr bgcolor="#d0d0d0" >";
            else
                Echo "<tr bgcolor="#eeeeee">";
        $fields = count($twoDimArray[$i]);
        $y = 0;
        echo '<td>'.$i. '</td>';
        foreach ($rowValue as  $fieldName => $fieldValue)
        {
            echo '<td>'.$fieldValue. '</td>';
            $y = $y + 1;
        }
        echo '</tr>';
        $i = $i + 1;
    }


    echo '</table>';
    }


    ?>