Code Examples -> Barcodes On The Fly With GD

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PHP Code Examples

Title :	Barcodes On The Fly With GD
Categories :	Ecommerce, Graphics, HTML and PHP, PHP	Steven Boger
Date :	Aug 02nd 1998
Grade :	3 of 5 (graded 10 times)
Viewed :	24665
File :	No file for this code example.
Images :	No Images for this code example.

Search :	More code by Steven Boger
Action :	Grade This Code Example
Tools :	My Examples List

Code

First, the REAL code here is the hard work of Stefan Powell,I have only modified it to be useable in a production environment. Notice, please test the actual barcode and let me know how it scans onscreen.

REQUIRED: GD compiled into PHP.

Features:

o No fonts needed. This creates barcodes on the fly, drawing them with gd.
o Amazingly fast and versatile. Specify the characters to convert to barcode ON THE FLY!
o Cool backup feature-If for some reason the operator can't get the barcode to scan, they hang their pointer over the barcode and the 'alt' feature displays the characters to enter in manually.

-Steven S. Boger
sboger@hotmail.com

NOTE1: IMPORTANT! THE PROGRAM THAT DISPLAYS THIS PAGE KEEPS PUTTING AN EXTRA " AFTER THE DOLLAR SIGN ON THE '"Z"=> "011010000", " "=> "011000100", "$"=> "010101000",' LINE. YOU *MUST* REMOVE THIS WHEN YOU COPY/PASTE THE CODE!

NOTE2: having just one extra blank line in code2 will make it puke. Put NO blank lines at the beginning.

code1(i.e. index.phtml)

<?php
function barcode($text) {
$enc_text = urlencode($text);
echo "<img src=\"barcode.phtml?$enc_text\" border=0 Alt=\"$text\">";
}
?>
<HTML>
<BODY bgcolor=white>
<?barcode( "steven boger");?>
</BODY>
</HTML>

code2(i.e. barcode.phtml) - just a few small mods to Stefan's code

<?php
$text = implode($argv, " ");
$barcodeheight=40;
$barcodethinwidth=2;
$barcodethickwidth=$barcodethinwidth*3;
$codingmap = Array( "0"=> "000110100", "1"=> "100100001",
"2"=> "001100001", "3"=> "101100000", "4"=> "000110001",
"5"=> "100110000", "6"=> "001110000", "7"=> "000100101",
"8"=> "100100100", "9"=> "001100100", "A"=> "100001001",
"B"=> "001001001", "C"=> "101001000", "D"=> "000011001",
"E"=> "100011000", "F"=> "001011000", "G"=> "000001101",
"H"=> "100001100", "I"=> "001001100", "J"=> "000011100",
"K"=> "100000011", "L"=> "001000011", "M"=> "101000010",
"N"=> "000010011", "O"=> "100010010", "P"=> "001010010",
"Q"=> "000000111", "R"=> "100000110", "S"=> "001000110",
"T"=> "000010110", "U"=> "110000001", "V"=> "011000001",
"W"=> "111000000", "X"=> "010010001", "Y"=> "110010000",
"Z"=> "011010000", " "=> "011000100", "$"=> "010101000",
"%"=> "000101010", "*"=> "010010100", "+"=> "010001010",
"-"=> "010000101", "."=> "110000100", "/"=> "010100010");
$text = strtoupper($text);
$text = "*$text*"; // add start/stop chars.
$textlen = strlen($text);
$barcodewidth = ($textlen)*(7*$barcodethinwidth + 3*$barcodethickwidth)-$barcodethinwidth;
$im = ImageCreate($barcodewidth,$barcodeheight);
$black = ImageColorAllocate($im,0,0,0);
$white = ImageColorAllocate($im,255,255,255);
imagefill($im,0,0,$white);
$xpos=0;
for ($idx=0;$idx<$textlen;$idx++) {
$char = substr($text,$idx,1);
// make unknown chars a '-';
if (!isset($codingmap[$char])) $char = "-";
for ($baridx=0;$baridx<=8;$baridx++) {
$elementwidth = (substr($codingmap[$char],$baridx,1)) ? $barcodethickwidth : $barcodethinwidth;
if (($baridx+1)%2) imagefilledrectangle($im,$xpos,0,$xpos + $elementwidth-1,$barcodeheight,$black);
$xpos+=$elementwidth;
}
$xpos+=$barcodethinwidth;
}
Header( "Content-type: image/gif");
ImageGif($im);
ImageDestroy($im);
return;
?>

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User Comments

	Steven Boger wrote : 369 `Some newer php versions use the GD library with Png, and need these lines changed in barcode.phtml: Header( "Content-type: image/gif"); ImageGif($im); to: Header( "Content-type: image/png"); ImagePng($im);`
	David Perez wrote :849 `this is very power full script will be god to implement it with multi character set , i mean latin1 iso-XXXX`