├── README.markdown
└── barcode.php


/README.markdown:
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 1 | # Code 39 Barcode generator
 2 | 
 3 | Simple PHP class for generating Code39 barcode images.  Really simple stuff: just do 
 4 | 
 5 | 	barcode::code39('text to encode');
 6 | 
 7 | Optionally, add a height in pixels and/or a width multiplier:
 8 | 
 9 | 	barcode::code39('text to encode', $height_in_px, $width_multiplier);
10 | 
11 | Currently it will always send the "Content-type: image/png" header and output the code. Future revisions may support writing to file, etc.
12 | 


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/barcode.php:
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 1 | <?
 2 | /*
 3 |  * Barcode Encoder tool
 4 |  * (C) 2008, Eric Stern
 5 |  * http://www.firehed.net, http://www.eric-stern.com
 6 |  *
 7 |  * This code may be re-used or re-distributed in any application, commercial
 8 |  * or non-commercial, free of charge provided that this credit remains intact.
 9 |  *
10 |  */
11 | 
12 | 
13 | class barcode {
14 | 	protected static $code39 = array(
15 | 	'0' => 'bwbwwwbbbwbbbwbw','1' => 'bbbwbwwwbwbwbbbw',
16 | 	'2' => 'bwbbbwwwbwbwbbbw','3' => 'bbbwbbbwwwbwbwbw',
17 | 	'4' => 'bwbwwwbbbwbwbbbw','5' => 'bbbwbwwwbbbwbwbw',
18 | 	'6' => 'bwbbbwwwbbbwbwbw','7' => 'bwbwwwbwbbbwbbbw',
19 | 	'8' => 'bbbwbwwwbwbbbwbw','9' => 'bwbbbwwwbwbbbwbw',
20 | 	'A' => 'bbbwbwbwwwbwbbbw','B' => 'bwbbbwbwwwbwbbbw',
21 | 	'C' => 'bbbwbbbwbwwwbwbw','D' => 'bwbwbbbwwwbwbbbw',
22 | 	'E' => 'bbbwbwbbbwwwbwbw','F' => 'bwbbbwbbbwwwbwbw',
23 | 	'G' => 'bwbwbwwwbbbwbbbw','H' => 'bbbwbwbwwwbbbwbw',
24 | 	'I' => 'bwbbbwbwwwbbbwbw','J' => 'bwbwbbbwwwbbbwbw',
25 | 	'K' => 'bbbwbwbwbwwwbbbw','L' => 'bwbbbwbwbwwwbbbw',
26 | 	'M' => 'bbbwbbbwbwbwwwbw','N' => 'bwbwbbbwbwwwbbbw',
27 | 	'O' => 'bbbwbwbbbwbwwwbw','P' => 'bwbbbwbbbwbwwwbw',
28 | 	'Q' => 'bwbwbwbbbwwwbbbw','R' => 'bbbwbwbwbbbwwwbw',
29 | 	'S' => 'bwbbbwbwbbbwwwbw','T' => 'bwbwbbbwbbbwwwbw',
30 | 	'U' => 'bbbwwwbwbwbwbbbw','V' => 'bwwwbbbwbwbwbbbw',
31 | 	'W' => 'bbbwwwbbbwbwbwbw','X' => 'bwwwbwbbbwbwbbbw',
32 | 	'Y' => 'bbbwwwbwbbbwbwbw','Z' => 'bwwwbbbwbbbwbwbw',
33 | 	'-' => 'bwwwbwbwbbbwbbbw','.' => 'bbbwwwbwbwbbbwbw',
34 | 	' ' => 'bwwwbbbwbwbbbwbw','*' => 'bwwwbwbbbwbbbwbw',
35 | 	'$' => 'bwwwbwwwbwwwbwbw','/' => 'bwwwbwwwbwbwwwbw',
36 | 	'+' => 'bwwwbwbwwwbwwwbw','%' => 'bwbwwwbwwwbwwwbw');
37 | 
38 | 
39 | 	public static function code39($text, $height = 50, $widthScale = 1) {
40 | 		if (!preg_match('/^[A-Z0-9-. $+\/%]+$/i', $text)) {
41 | 			throw new Exception('Invalid text input.');
42 | 		}
43 | 		
44 | 		$text = '*' . strtoupper($text) . '*'; // *UPPERCASE TEXT*
45 | 		$length = strlen($text);
46 | 
47 | 		$barcode = imageCreate($length * 16 * $widthScale, $height);
48 | 
49 | 		$bg = imagecolorallocate($barcode, 255, 255, 0); //sets background to yellow
50 | 		imagecolortransparent($barcode, $bg); //makes that yellow transparent
51 | 		$black = imagecolorallocate($barcode, 0, 0, 0); //defines a color for black
52 | 
53 | 		$chars = str_split($text);
54 | 
55 | 		$colors = '';
56 | 
57 | 		foreach ($chars as $char) {
58 | 			$colors .= self::$code39[$char];
59 | 		}
60 | 
61 | 		foreach (str_split($colors) as $i => $color) {
62 | 			if ($color == 'b') {
63 | 				// imageLine($barcode, $i, 0, $i, $height-13, $black);
64 | 				imageFilledRectangle($barcode, $widthScale * $i, 0, $widthScale * ($i+1) -1 , $height-13, $black);
65 | 			}
66 | 		}
67 | 
68 | 		//16px per bar-set, halved, minus 6px per char, halved (5*length)
69 | 		// $textcenter = $length * 5 * $widthScale;
70 | 		$textcenter = ($length * 8 * $widthScale) - ($length * 3);
71 | 		
72 | 		imageString($barcode, 2, $textcenter, $height-13, $text, $black);
73 | 
74 | 		header('Content-type: image/png');
75 | 		imagePNG($barcode);
76 | 		imageDestroy($barcode);
77 | 		exit;
78 | 	} // function code39
79 | } // class barcode
80 | 


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