PHP - Barcode In Pdf

so I have this code that makes a barcode:
Code: [Select]
<?php
session_start(); // Must start session first thing
/* 
Created By Adam Khoury @ www.flashbuilding.com 
-----------------------June 20, 2008----------------------- 
*/
// Here we run a login check
if (!isset($_SESSION['id'])) { 
   echo 'Please <a href="login.php">log in</a> to access your account';
   exit(); 
}
//Connect to the database through our include 
include_once "connect_to_mysql.php";
// Place Session variable 'id' into local variable
$userid = $_SESSION['id'];
// Query member data from the database and ready it for display
$sql = mysql_query("SELECT * FROM members WHERE userid='$userid' LIMIT 1");
while($row = mysql_fetch_array($sql)){
$name = $row['name'];
$phone = $row["phone"];
$username = $row["username"];
$address = $row["address"];
$city = $row["city"];
$state = $row["state"];
$zip = $row["zip"];
$cell = $row["cell"];
$email = $row["email"];
$accounttype = $row["accounttype"];
$rank = $row["rank"];
$badges = $row["badges"];
}

$sql = mysql_query("SELECT * FROM Events WHERE userid='$userid' && eventid=".$_GET['eventid']."");
while($row = mysql_fetch_array($sql)){
$price1 = $row['price1'];
$price2 = $row["price2"];
$price3 = $row["price3"];
$price4 = $row["price4"];
$price5 = $row["price5"];
$price6 = $row["price6"];
$price7 = $row["price7"];
$price8 = $row["price8"];
$title1 = $row['title1'];
$title2 = $row['title2'];
$title3 = $row['title3'];
$title4 = $row['title4'];
$title5 = $row['title5'];
$title6 = $row['title6'];
$title7 = $row['title7'];
$title8 = $row['title8'];
$barcode1 = $row['barcode'];


}



$total = $price1 + $price2 + $price3 + $price4 +$price5 + $price6 + $price7 + $price8;


require('fpdf.php');
class PDF extends FPDF

{
function EAN13($x=1, $y, $barcode, $h=16, $w=.35)
{
    $this->Barcode(13,200,$barcode,$h,$w,13);
}

function UPC_A($x, $y, $barcode, $h=16, $w=.35)
{
    $this->Barcode($x,$y,$barcode,$h,$w,12);
}

function GetCheckDigit($barcode)
{
    //Compute the check digit
    $sum=0;
    for($i=1;$i<=11;$i+=2)
        $sum+=3*$barcode[$i];
    for($i=0;$i<=10;$i+=2)
        $sum+=$barcode[$i];
    $r=$sum%10;
    if($r>0)
        $r=10-$r;
    return $r;
}

function TestCheckDigit($barcode)
{
    //Test validity of check digit
    $sum=0;
    for($i=1;$i<=11;$i+=2)
        $sum+=3*$barcode[$i];
    for($i=0;$i<=10;$i+=2)
        $sum+=$barcode[$i];
    return ($sum+$barcode[12])%10==0;
}

function Barcode($x, $y, $barcode, $h, $w, $len)
{
    //Padding
    $barcode=str_pad($barcode,$len-1,'0',STR_PAD_LEFT);
    if($len==12)
        $barcode='0'.$barcode;
    //Add or control the check digit
    if(strlen($barcode)==12)
        $barcode.=$this->GetCheckDigit($barcode);
    elseif(!$this->TestCheckDigit($barcode))
        $this->Error('Incorrect check digit');
    //Convert digits to bars
    $codes=array(
        'A'=>array(
            '0'=>'0001101','1'=>'0011001','2'=>'0010011','3'=>'0111101','4'=>'0100011',
            '5'=>'0110001','6'=>'0101111','7'=>'0111011','8'=>'0110111','9'=>'0001011'),
        'B'=>array(
            '0'=>'0100111','1'=>'0110011','2'=>'0011011','3'=>'0100001','4'=>'0011101',
            '5'=>'0111001','6'=>'0000101','7'=>'0010001','8'=>'0001001','9'=>'0010111'),
        'C'=>array(
            '0'=>'1110010','1'=>'1100110','2'=>'1101100','3'=>'1000010','4'=>'1011100',
            '5'=>'1001110','6'=>'1010000','7'=>'1000100','8'=>'1001000','9'=>'1110100')
        );
    $parities=array(
        '0'=>array('A','A','A','A','A','A'),
        '1'=>array('A','A','B','A','B','B'),
        '2'=>array('A','A','B','B','A','B'),
        '3'=>array('A','A','B','B','B','A'),
        '4'=>array('A','B','A','A','B','B'),
        '5'=>array('A','B','B','A','A','B'),
        '6'=>array('A','B','B','B','A','A'),
        '7'=>array('A','B','A','B','A','B'),
        '8'=>array('A','B','A','B','B','A'),
        '9'=>array('A','B','B','A','B','A')
        );
    $code='101';
    $p=$parities[$barcode[0]];
    for($i=1;$i<=6;$i++)
        $code.=$codes[$p[$i-1]][$barcode[$i]];
    $code.='01010';
    for($i=7;$i<=12;$i++)
        $code.=$codes['C'][$barcode[$i]];
    $code.='101';
    //Draw bars
    for($i=0;$i<strlen($code);$i++)
    {
        if($code[$i]=='1')
            $this->Rect($x+$i*$w,$y,$w,$h,'F');
    }
    //Print text uder barcode
    $this->SetFont('Arial','B',12);
    $this->Text($x,$y+$h+11/$this->k,substr($barcode,-$len));
}


//Instanciation of inherited class
$pdf=new PDF();
$pdf->AliasNbPages();
$pdf->AddPage();

//* here is part of barcode
$pdf->EAN13(10, 120, $barcode1);
$pdf->SetFont('Arial','B',12);
$pdf->Output('ticket.pdf', 'I');
?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
</head>

<body>
</body>
</html> 

How do I make it so that the bars still draw correctly, but they don't draw from the code, they draw from $barcode. or how do I put the value of $barcode into there.........currently it has to be a 8 digit $barcode and I believe 4-5 random numbers either on front or back.  I want to be able to make $barcode have the value of an ean 13 barcode(which is how many numbers? 13 right?)  and so that that is the only thing dictating barcode(I do know how to make it more numbers, but I cant do that because of the 5 random ones).  does this make sense?