PHP - Serial Key Help

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http://www.phpfreaks.com/forums/index.php?topic=332690.0

Hi all, I want to send a string of data to serial port. Below is the code. Sdata contains the string. for example "<LT-ON-50>".

<?php
exec("mode com3: BAUD=600 PARITY=n DATA=8 STOP=1 to=off dtr=off rts=off");
if (isset($_GET['action'])) {
    $SData = $_GET['action'];
    $fp = fopen("com3","w");
    fwrite($fp,$SData);
    fclose($fp);
}
?>

unfortunately, it will send only one character i.e '<'. the remaining characters will be lost. What could be wrong in the code. Any help can be greatly appreciated. Thanks,  

I made a function which displays the left and right children of the root. However i need to add serial numbers to them. Due to Recursive functions i'm not quite able to to do so . Can someone please help me?
Code: [Select]
function side_display($root)
  {
      $sql = "SELECT lchild,rchild FROM tree WHERE parent='".$root."'";
      $sqlexec = mysql_query($sql);
      $array = mysql_fetch_array($sqlexec);
      if(!empty($array['lchild']) && $array['lchild'] != '0')
      {
          echo "<tr>";

          echo "<td>".($array['lchild'])."</td>";
          $get = "SELECT * FROM member WHERE member_id='".$array['lchild']."'";
          $execget = mysql_query($get);
          $getarray = mysql_fetch_array($execget);
          echo "<td>".$getarray['fname']." ".$getarray['lname']."</td>";
          echo "<td>".$getarray['id_sponsor']."</td>" ;
          echo "<td>Left</td>";
          echo "<td>".$getarray['doj']."</td>" ;
          echo "</tr>";
          side_display($array['lchild']);
      }
      if(!empty($array['rchild']) && $array['rchild'] != '0')
      {
         echo "<tr>";

          echo "<td>".($array['rchild'])."</td>";
          $get = "SELECT * FROM member WHERE member_id='".$array['rchild']."'";
          $execget = mysql_query($get);
          $getarray = mysql_fetch_array($execget);
          echo "<td>".$getarray['fname']." ".$getarray['lname']."</td>";
          echo "<td>".$getarray['id_sponsor']."</td>" ;
          echo "<td>Right</td>";
          echo "<td>".$getarray['doj']."</td>" ;
          echo "</tr>";
         
          side_display($array['rchild']);
      }
   
  }

So I have this function which generates a random serial # that is 12 characters long.  However I want to insert a dash  every four characters like so: XXXX-XXXX-XXXX
Any suggestions?

Code: [Select]
<?php
$serial1 = get_serial_num(12);

//Serial # function
function get_serial_num($number_cnt){
 $ret_arr = array();
 $serial = "";
 $ser_num = array("1","2","3","4","5","6","7","8","9","0","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");
 for($i = 0; $i < $number_cnt; $i++){
   $rand = rand(0,count($ser_num)-1);
   $val = wordwrap($ser_num[$rand],1,"\n", true);
   $serial .= $val;
   
 }
 return $serial;
}
echo ''.$serial1.'';
?>
Warning: I am a bit noobish.

How can you use PHP to generate a serial number?

e.g. DF34-VB89-98AP-34NQ-QQUI-23AW