以下轉載原文
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在 EcStart 論壇 看這個實用的功能，原則上 PHP 要有支援 GD 的功能就可以了！
使用的方式很簡單 ... 範例語法如下
<IMG SRC="barcode.php?barcode=HELLO&quality=75">
<IMG SRC="barcode.php?barcode=123456&width=320&height=200">
程式碼在這個地方
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以下轉載程式碼
<?php
/*===========================================================================*/
/* PHP Barcode Image Generator v1.0 [9/28/2000]
Copyright (C)2000 by Charles J. Scheffold - cs@wsia.fm
This code is hereby released into the public domain.
Use it, abuse it, just don't get caught using it for something stupid.
The only barcode type currently supported is Code 3 of 9. Don't ask about
adding support for others! This is a script I wrote for my own use. I do
plan to add more types as time permits but currently I only require
Code 3 of 9 for my purposes. Just about every scanner on the market today
can read it.
PARAMETERS:
-----------
$barcode = [required] The barcode you want to generate
$type = (default=0) It's 0 for Code 3 of 9 (the only one supported)
$width = (default=160) Width of image in pixels. The image MUST be wide
enough to handle the length of the given value. The default
value will probably be able to display about 6 digits. If you
get an error message, make it wider!
$height = (default=80) Height of image in pixels
$format = (default=jpeg) Can be "jpeg", "png", or "gif"
$quality = (default=100) For JPEG only: ranges from 0-100
$text = (default=1) 0 to disable text below barcode, >=1 to enable
NOTE: You must have GD-1.8 or higher compiled into PHP
in order to use PNG and JPEG. GIF images only work with
GD-1.5 and lower. (http://www.boutell.com)
ANOTHER NOTE: If you actually intend to print the barcodes
and scan them with a scanner, I highly recommend choosing
JPEG with a quality of 100. Most browsers can't seem to print
a PNG without mangling it beyond recognition.
USAGE EXAMPLES FOR ANY PLAIN OLD HTML DOCUMENT:
-----------------------------------------------
<IMG SRC="barcode.php?code=HELLO&quality=75">
<IMG SRC="barcode.php?code=123456&width=320&height=200">
*/
/*=============================================================================*/
//-----------------------------------------------------------------------------
// Startup code
//-----------------------------------------------------------------------------
if (!isset ($text)) $text = 1;
if (empty ($quality)) $quality = 100;
if (empty ($width)) $width = 160;
if (empty ($height)) $height = 80;
if (!empty ($format)) $format = strtoupper ($format);
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 ($BarcodeFull, "string");
if ($text != 0)
{
$FontNum = 3;
$FontHeight = ImageFontHeight ($FontNum);
$FontWidth = ImageFontWidth ($FontNum);
$CenterLoc = (int)(($width-1) / 2) - (int)(($FontWidth * strlen($BarcodeFull)) / 2);
ImageString ($im, $FontNum, $CenterLoc, $height-$FontHeight, "$BarcodeFull", $Black);
}
for ($i=0; $i<strlen($BarcodeFull); $i++)
{
$StripeCode = Code39 ($BarcodeFull[$i]);
for ($n=0; $n < 9; $n++)
{
if ($Color == $White) $Color = $Black;
else $Color = $White;
switch ($StripeCode[$n])
{
case '0':
ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$NarrowBar, $height-1-$FontHeight-2, $Color);
$CurrentBarX += $NarrowBar;
break;
case '1':
ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$WideBar, $height-1-$FontHeight-2, $Color);
$CurrentBarX += $WideBar;
break;
}
}
$Color = $White;
ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$QuietBar, $height-1-$FontHeight-2, $Color);
$CurrentBarX += $QuietBar;
}
OutputImage ($im, $format, $quality);
}
//-----------------------------------------------------------------------------
// Output an image to the browser
//-----------------------------------------------------------------------------
function OutputImage ($im, $format, $quality)
{
switch ($format)
{
case "JPEG":
ImageJPEG ($im, "", $quality);
break;
case "PNG":
ImagePNG ($im);
break;
case "GIF":
ImageGIF ($im);
break;
}
}
//-----------------------------------------------------------------------------
// Returns the Code 3 of 9 value for a given ASCII character
//-----------------------------------------------------------------------------
function Code39 ($Asc)
{
switch ($Asc)
{
case ' ':
return "011000100";
case '$':
return "010101000";
case '%':
return "000101010";
case '*':
return "010010100"; // * Start/Stop
case '+':
return "010001010";
case '|':
return "010000101";
case '.':
return "110000100";
case '/':
return "010100010";
case '0':
return "000110100";
case '1':
return "100100001";
case '2':
return "001100001";
case '3':
return "101100000";
case '4':
return "000110001";
case '5':
return "100110000";
case '6':
return "001110000";
case '7':
return "000100101";
case '8':
return "100100100";
case '9':
return "001100100";
case 'A':
return "100001001";
case 'B':
return "001001001";
case 'C':
return "101001000";
case 'D':
return "000011001";
case 'E':
return "100011000";
case 'F':
return "001011000";
case 'G':
return "000001101";
case 'H':
return "100001100";
case 'I':
return "001001100";
case 'J':
return "000011100";
case 'K':
return "100000011";
case 'L':
return "001000011";
case 'M':
return "101000010";
case 'N':
return "000010011";
case 'O':
return "100010010";
case 'P':
return "001010010";
case 'Q':
return "000000111";
case 'R':
return "100000110";
case 'S':
return "001000110";
case 'T':
return "000010110";
case 'U':
return "110000001";
case 'V':
return "011000001";
case 'W':
return "111000000";
case 'X':
return "010010001";
case 'Y':
return "110010000";
case 'Z':
return "011010000";
default:
return "011000100";
}
}
?>
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