Display Bar code image giving Charactar is not allowed - php

Question

with help of below code, i successfully displaying tracking_id in pdf , Now i am trying to displaying bar code image....
Its working fine if i use static value . but when i passed column value instead of static value it gave error :
Static : $text = isset($_GET['text']) ? $_GET['text'] : "1234";
:
Dynamic :
$text = isset($_GET['text']) ? $_GET['text'] : $tracking_id;
Result :
I guess I am passing tracking_id column value not in proper manner :
<?php
$con = mysqli_connect("localhost","root","iJ564645qA9v3J","do_management4");
include('database.php');
$result = mysqli_query($con,"SELECT * FROM orders");
while($row = mysqli_fetch_array($result))
{
$id = $row['id'];
$tracking_id = $row['tracking_id'];
}
$database = new Database();
$result = $database->runQuery("SELECT tracking_id FROM orders where id = '".$_REQUEST['id']."'");
$header = $database->runQuery("SELECT UCASE(`COLUMN_NAME`)
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA`='do_management4'
AND `TABLE_NAME`='orders'
and `COLUMN_NAME` in ('tracking_id')");
require __DIR__ . '/../vendor/autoload.php';
use BarcodeBakery\Barcode\BCGcode11;
// Loading Font
$font = new BCGFontFile(__DIR__ . '/../font/Arial.ttf', 18);
// Don't forget to sanitize user inputs
$text = isset($_GET['text']) ? $_GET['text'] : $tracking_id;
// The arguments are R, G, B for color.
$color_black = new BCGColor(0, 0, 0);
$color_white = new BCGColor(255, 255, 255);
$drawException = null;
try {
$code = new BCGcode11();
$code->setScale(2); // Resolution
$code->setThickness(30); // Thickness
$code->setForegroundColor($color_black); // Color of bars
$code->setBackgroundColor($color_white); // Color of spaces
$code->setFont($font); // Font (or 0)
$code->parse($text); // Text
} catch (Exception $exception) {
$drawException = $exception;
}
$drawing = new BCGDrawing('', $color_white);
if ($drawException) {
$drawing->drawException($drawException);
} else {
$drawing->setBarcode($code);
$drawing->draw();
}
// Header that says it is an image (remove it if you save the barcode to a file)
header('Content-Type: image/png');
header('Content-Disposition: inline; filename="barcode.png"');
// Draw (or save) the image into PNG format.
$drawing->finish(BCGDrawing::IMG_FORMAT_PNG);
?>

Answer 1

Considering the documentation BCGcode11 allows only the numbers from 0 to 9 and a hyphen (-)
You either can
Remove the unwanted characters from $tracking_id which may lead to wrong datas
Use the proper class for the barecode you want.
BCGcode39 allows more characters to build your barecode : Code 39 contains all the capital letters, the numbers from 0 to 9, the following special characters "-.$/+%" and spaces.

Answer 2

Use BCGcode39 it allows you to use more characters lik capital letters and some special characters. or keep using BCGcode11 but then you need to remove the unallowed characters.