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[perkiset]

Here is a little class I put together to generate bar codes on the fly. It is reasonably well tested, but not thoroughly. It does a bit of work to try to protect you from doing something stupid (like output with an unsupported format) but again, not a lot. These barcodes should be readable by any standard barcode scanner.

It is quite simple. Create an instance of the class (either supplying the initial geometry of the barcode or letting the class set defaults) then build a code, passing the text, optionally showing the text value at the base of the code and optionally to a file or streamed directly out.

Options

• mode: Output file type. GIF, PNG, JPEG, WBMP. Default is GIF.
• bcThinWidth: the pixel width of the thin line in the code. Default is 2px.
• bcThickWidth: multiple of thin line for thick lines. Default is 3.
• bcHeight: overall height of the output image. Default is 50px
• bcFontSize: stock GD font size. Default is 2 (about a 12px)
• showText: Display the input text in a small white box, centered at the bottom of the image. Default is false
• fileName: If this parameter is passed, then the output of the function will be into a file. Otherwise (default) it will be streamed directly back out to the browser.

Here are a couple examples with the Show Text option set on:






Enjoy!

IMPORTANT: This is the original code.
Please check the bottom of the thread for updated versions

<?php

$bc = new barCode();
$bc->build('hello world');

class barCode
{

public $bcHeight, $bcThinWidth, $bcThickWidth, $bcFontSize, $mode;

function __construct($mode='gif', $height=50, $thin=2, $thick=3, $fSize=2)

{

$this->bcHeight = $height;

$this->bcThinWidth = $thin;

$this->bcThickWidth = $this->bcThinWidth * $thick;

$this->fontSize = $fSize;

$this->mode = $mode;

$this->outMode = array('gif'=>'gif', 'png'=>'png', 'jpeg'=>'jpeg', 'wbmp'=>'vnd.wap.wbmp');

$this->codeMap = array(

'0'=>'000110100',

'1'=>'100100001',

'2'=>'001100001',

'3'=>'101100000',

'4'=>'000110001',

'5'=>'100110000',

'6'=>'001110000',

'7'=>'000100101',

'8'=>'100100100',

'9'=>'001100100',

'A'=>'100001001',

'B'=>'001001001',

'C'=>'101001000',

'D'=>'000011001',

'E'=>'100011000',

'F'=>'001011000',

'G'=>'000001101',

'H'=>'100001100',

'I'=>'001001100',

'J'=>'000011100',

'K'=>'100000011',

'L'=>'001000011',

'M'=>'101000010',

'N'=>'000010011',

'O'=>'100010010',

'P'=>'001010010',

'Q'=>'000000111',

'R'=>'100000110',

'S'=>'001000110',

'T'=>'000010110',

'U'=>'110000001',

'V'=>'011000001',

'W'=>'111000000',

'X'=>'010010001',

'Y'=>'110010000',

'Z'=>'011010000',

' '=>'011000100',

'$'=>'010101000',

'%'=>'000101010',

'*'=>'010010100',

'+'=>'010001010',

'-'=>'010000101',

'.'=>'110000100',

'/'=>'010100010'

);        

}

public function build($text='', $showText=false, $fileName=null)

{

if (trim($text) <= ' ') 

throw new exception('barCode::build - must be passed text to operate');

if (!$fileType = $this->outMode[$this->mode]) 

throw new exception("barCode::build - unrecognized output format ({$this->mode})");

if (!function_exists("image{$this->mode}")) 

throw new exception("barCode::build - unsupported output format ({$this->mode} - check phpinfo)");

$text  =  strtoupper($text);

$dispText = "* $text *";

$text = "*$text*"; // adds start and stop chars

$textLen  =  strlen($text); 

$barcodeWidth  =  $textLen * (7 * $this->bcThinWidth + 3 * $this->bcThickWidth) - $this->bcThinWidth; 

$im = imagecreate($barcodeWidth, $this->bcHeight); 

$black = imagecolorallocate($im, 0, 0, 0); 

$white = imagecolorallocate($im, 255, 255, 255); 

imagefill($im, 0, 0, $white); 

$xpos = 0;

for ($idx=0; $idx<$textLen; $idx++)

{ 

if (!$char = $text[$idx]) $char = '-';

for ($ptr=0; $ptr<=8; $ptr++)

{ 

$elementWidth = ($this->codeMap[$char][$ptr]) ? $this->bcThickWidth : $this->bcThinWidth; 

if (($ptr + 1) % 2) 

imagefilledrectangle($im, $xpos, 0, $xpos + $elementWidth-1, $this->bcHeight, $black); 

$xpos += $elementWidth; 

}

$xpos += $this->bcThinWidth; 

}

if ($showText)

{

$pxWid = imagefontwidth($this->fontSize) * strlen($dispText) + 10;

$pxHt = imagefontheight($this->fontSize) + 2;

$bigCenter = $barcodeWidth / 2;

$textCenter = $pxWid / 2;

imagefilledrectangle($im, $bigCenter - $textCenter, $this->bcHeight - $pxHt, $bigCenter + $textCenter, $this->bcHeight, $white);

imagestring($im, $this->fontSize, ($bigCenter - $textCenter) + 5, ($this->bcHeight - $pxHt) + 1, $dispText, $black);

}

if (!$fileName) header("Content-type:  image/{$fileType}");

switch($this->mode)

{

case 'gif': imagegif($im, $fileName);

case 'png': imagepng($im, $fileName);

case 'jpeg': imagejpeg($im, $fileName);

case 'wbmp': imagewbmp($im, $fileName);

}

imagedestroy($im); 

}
}

?>

[nutballs]

Any particular code type?

[perkiset]

Um, yeah. Lines.  I dunno which encoding this is ... I scoffed the bitmaps from another site. I'll look it up.

[perkiset]

It's Code39. You may check my work here:

h++p : / / everything2 dot com/title/three+of+nine

[isthisthingon]

ZXing ("Zebra Crossing")



Open source barcode image processing library for Java and Android.  Handy since the built-in camera that acts as a barcode scanner is typically built into the device   If nothing else perks, perhaps their code would be helpful to enhance your PHP 

http://code.google.com/p/zxing/

[perkiset]

Thanks ITTO

Loves me some simple GD and Code3of9 though. No Java no more for me

[isthisthingon]

>No Java no more for me

You think Java's more challenging than people or multi-corp tax friendly business strategies?  IMO, it gives those who parade around as "brilliant" an alibi for failing at social life   Java only recognizes someone as an "expert" if they surrender enough of themselves to earn the title 

[kurdt]

Great piece of code

Now go and make me PHP code that does these little things: http://techtv.mit.edu/collections/newsoffice/videos/3489-bokode-imperceptible-visual-tags-for-camera-based-interaction-from-a-distance

Then I'll be all

[perkiset]

You think Java's more challenging than people or multi-corp tax friendly business strategies?  IMO, it gives those who parade around as "brilliant" an alibi for failing at social life   Java only recognizes someone as an "expert" if they surrender enough of themselves to earn the title 

Too true. I recall a certain egghead in our past (20 years ago now. Hows THAT to f*&k up your morning coffee?) that hangs there to this day. Good for him and they that choose it, but I really don't like it one bit at all.

I enjoy this "life" thing.

[perkiset]

Now go and make me PHP code that does these little things: http://techtv.mit.edu/collections/newsoffice/videos/3489-bokode-imperceptible-visual-tags-for-camera-based-interaction-from-a-distance

Been there, done that. Pain in the ass and I couldn't get my warehouse workers to be able to identify it without a whole lot of training on how to squint their eyes correctly, so I gave up. Simple binary for me 

[krustee]

Thanks for the code perks, I am actually putting it to good use as we speak.

[perkiset]

  glad to hear it K.

[mackdaddy]

Hello!  This looks like just the thing I'm looking for, but when I created a bar code for 'MA003X' it scans as 'MA--3X'.  It might be my scanner, but all the other characters seem fine.  Any ideas?

[perkiset]

It's funny, I had that problem with one of my barcode scanners as well. Never did figure it out, modified the code to take - as 0 because I was certain of the code (it is always mine).

I read codes manually and it looked all OK, but that's what the scanner came back with. I always wondered if it was looking for a different code for 0, because what is generated is accurate. Love to hear if you get any data on this, because it is pretty weird.

[bergmp]

It's funny, I had that problem with one of my barcode scanners as well. Never did figure it out, modified the code to take - as 0 because I was certain of the code (it is always mine).

I read codes manually and it looked all OK, but that's what the scanner came back with. I always wondered if it was looking for a different code for 0, because what is generated is accurate. Love to hear if you get any data on this, because it is pretty weird.

did you replace it on $this->codeMap = array(... Does it worked for you? :|