Thanks to a skilled PHP programmer, the internet has a ready made PHP script that takes a text string and returns an image representation in barcode format.

Here’s the complete script:

=1 to enable


        NOTE: You must have GD-1.8 or higher compiled into PHP
        in order to use PNG and JPEG. GIF images only work with
        GD-1.5 and lower. (http://www.boutell.com)


        ANOTHER NOTE: If you actually intend to print the barcodes 
        and scan them with a scanner, I highly recommend choosing 
        JPEG with a quality of 100. Most browsers can't seem to print 
        a PNG without mangling it beyond recognition. 


        USAGE EXAMPLES FOR ANY PLAIN OLD HTML DOCUMENT:
        -----------------------------------------------


        


        
                
        
*/
/*=============================================================================*/


//-----------------------------------------------------------------------------
// Startup code
//-----------------------------------------------------------------------------


if(isset($_GET["text"])) $text=$_GET["text"];
if(isset($_GET["format"])) $format=$_GET["format"];
if(isset($_GET["quality"])) $quality=$_GET["quality"];
if(isset($_GET["width"])) $width=$_GET["width"];
if(isset($_GET["height"])) $height=$_GET["height"];
if(isset($_GET["type"])) $type=$_GET["type"];
if(isset($_GET["barcode"])) $barcode=$_GET["barcode"];




if (!isset ($text)) $text = 1;
if (!isset ($type)) $type = 1;
if (empty ($quality)) $quality = 100;
if (empty ($width)) $width = 160;
if (empty ($height)) $height = 80;
if (!empty ($format)) $format = strtoupper ($format);
        else $format="PNG";


switch ($type)
{
        default:
                $type = 1;
        case 1:
                Barcode39 ($barcode, $width, $height, $quality, $format, $text);
                break;          
}


//-----------------------------------------------------------------------------
// Generate a Code 3 of 9 barcode
//-----------------------------------------------------------------------------
function Barcode39 ($barcode, $width, $height, $quality, $format, $text)
{
        switch ($format)
        {
                default:
                        $format = "JPEG";
                case "JPEG": 
                        header ("Content-type: image/jpeg");
                        break;
                case "PNG":
                        header ("Content-type: image/png");
                        break;
                case "GIF":
                        header ("Content-type: image/gif");
                        break;
        }


        $im = ImageCreate ($width, $height)
    or die ("Cannot Initialize new GD image stream");
        $White = ImageColorAllocate ($im, 255, 255, 255);
        $Black = ImageColorAllocate ($im, 0, 0, 0);
        //ImageColorTransparent ($im, $White);
        ImageInterLace ($im, 1);



        $NarrowRatio = 20;
        $WideRatio = 55;
        $QuietRatio = 35;


        $nChars = (strlen($barcode)+2) * ((6 * $NarrowRatio) + (3 * $WideRatio) + ($QuietRatio));
        $Pixels = $width / $nChars;
        $NarrowBar = (int)(20 * $Pixels);
        $WideBar = (int)(55 * $Pixels);
        $QuietBar = (int)(35 * $Pixels);


        $ActualWidth = (($NarrowBar * 6) + ($WideBar*3) + $QuietBar) * (strlen ($barcode)+2);
        
        if (($NarrowBar == 0) || ($NarrowBar == $WideBar) || ($NarrowBar == $QuietBar) || ($WideBar == 0) || ($WideBar == $QuietBar) || ($QuietBar == 0))
        {
                ImageString ($im, 1, 0, 0, "Image is too small!", $Black);
                OutputImage ($im, $format, $quality);
                exit;
        }
        
        $CurrentBarX = (int)(($width - $ActualWidth) / 2);
        $Color = $White;
        $BarcodeFull = "*".strtoupper ($barcode)."*";
        settype ($BarcodeFull, "string");
        
        $FontNum = 3;
        $FontHeight = ImageFontHeight ($FontNum);
        $FontWidth = ImageFontWidth ($FontNum);
        if ($text != 0)
        {
                $CenterLoc = (int)(($width-1) / 2) - (int)(($FontWidth * strlen($BarcodeFull)) / 2);
                ImageString ($im, $FontNum, $CenterLoc, $height-$FontHeight, "$BarcodeFull", $Black);
        }
        else
        {
            $FontHeight=-2;
        }


        for ($i=0; $i<strlen($BarcodeFull); $i++)
        {
                $StripeCode = Code39 ($BarcodeFull[$i]);


                for ($n=0; $n 

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