Jog My Memory

[Dysan]

It's been a long time since the basis of this script was written, and therefore I can't remember how the values in the array ($replace) are generated.

Can anybody jog my memory?

<?php
$rectangle_width = 2;
$rectangle_height = 100;

$image = imagecreatetruecolor(300, 188);
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);

imagefill($image, 0, 0, $white);
imagerectangle($image, 0, 0, 298, 186, $black);

$find = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '*');
$replace = array('1010001110111010', '1110100010101110', '1011100010101110', '1110111000101010', '1010001110101110', '1110100011101010', '1011100011101010', '1010001011101110', '1110100010111010', '1011100010111010', '1000101110111010');

$string = '*111111*';
$textstring = str_replace($find, $replace, $string);

$j = 11;
$sarray = str_split($textstring, 1);
for($i = 0; $i < count($sarray); $i++)
{
    if($sarray[$i] ==  '0')
    {
        imagefilledrectangle($image, $rectangle_width * $j, 150, ($rectangle_width * $j) + $rectangle_width, $rectangle_height, $white);
        $j++;

}
elseif($sarray[$i] ==  '1')
{
    imagefilledrectangle($image, $rectangle_width * $j, 150, ($rectangle_width * $j) + $rectangle_width, $rectangle_height, $black);
    $j++;
}
} 

imagettftext($image, 10, 0, 120, 170, $black, "Verdana", $string);

header("Content-type: image/jpeg");
imagejpeg($image);
imagedestroy($image);
?>

[bpat1434]

I have no idea. Looks like binary to me... but this is where comments come in hand 🙂

[Dysan]

I have just found out that they are not binary values, they are a string. According to the page found at the following URL, each character has 6 narrow and 3 wide bars plus an ending delimiter.

http://www.barcodeman.com/info/c39_1.php3

There is a 3:1 ratio for wide bars meaning the 3 wide bars take the space of 9 narrow ones. So 3 wide (equiv. 9 narrow) plus 6 narrow + delimiter = 16.

Can a script be created that automatically generates the string automatically, allowing me to simply copy and paste the code into my barcode script?

[bpat1434]

Ah, I got ya. Well, it's just a matter of taking that picture and putting those into your format. So something like this would work:

function genBarcode($string)
{
  $lookup = array(
    '0' =>  '101000111011101',
    '1' =>  '111010001010111',
    '2' =>  '101110001010111',
    '3' =>  '111011100010101',
    '4' =>  '101000111010111',
    '5' =>  '111010001110101',
    '6' =>  '101110001110101',
    '7' =>  '101000101110111',
    '8' =>  '111010001011101',
    '9' =>  '101110001011101',
    'A' =>  '111010100010111',
    'B' =>  '101110100010111',
    'C' =>  '111011101000101',
    'D' =>  '101011100010111',
    'E' =>  '111010111000101',
    'F' =>  '101110111000101',
    'G' =>  '101010001110111',
    'H' =>  '111010100011101',
    'I' =>  '101110100011101',
    'J' =>  '101011100011101',
    'K' =>  '111010101000111',
    'L' =>  '101110101000111',
    'M' =>  '111011101010001',
    'N' =>  '101011101000111',
    'O' =>  '111010111010001',
    'P' =>  '101110111010001',
    'Q' =>  '101010111000111',
    'R' =>  '111010101110001',
    'S' =>  '101110101110001',
    'T' =>  '101011101110001',
    'U' =>  '111000101010111',
    'V' =>  '100011101010111',
    'W' =>  '111000111010101',
    'X' =>  '100010111010111',
    'Y' =>  '111000101110101',
    'Z' =>  '100011101110101',
    '-' =>  '100010101110111',
    '.' =>  '111000101011101',
    ' ' =>  '100011101011101',
    '*' =>  '100010111011101',
    '$' =>  '100010001000101',
    '/' =>  '100010001010001',
    '+' =>  '100010100010001',
    '%' =>  '101000100010001',
  );

  if(is_null($string) || empty($string))
    return false;

  $barcode = $lookup['*'];
  for($i=0; $i<strlen($string); $i++)
  {
    $barcode .= $lookup[strtoupper($string[$i])] . '0'; // "0" which is the delimiter for the character
  }
  $barcode = $lookup['*'];

  return $barcode;
}

It's not tested, but it looks like it might work for you. Hope it helps.

[Dysan]

Brilliant,

I test that tomorrow, and let you know if it works.

Is it possible to centre align the bar code and text (e.g "111111") , so that they are in the middle of the square?

[bpat1434]

In an image?

[Dysan]

Yes, in an image.

Why doesn't the following code work? - No barcode gets displayed.

<?php
$rectangle_width = 2;
$rectangle_height = 100;

$image = imagecreatetruecolor(300, 188);
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);

imagefill($image, 0, 0, $white);
imagerectangle($image, 0, 0, 298, 186, $black);


$replace = array(
    '0' =>  '1010001110111010',
    '1' =>  '1110100010101110',
    '2' =>  '1011100010101110',
    '3' =>  '1110111000101010',
    '4' =>  '1010001110101110',
    '5' =>  '1110100011101010',
    '6' =>  '1011100011101010',
    '7' =>  '1010001011101110',
    '8' =>  '1110100010111010',
    '9' =>  '1011100010111010',
    'A' =>  '1110101000101110',
    'B' =>  '1011101000101110',
    'C' =>  '1110111010001010',
    'D' =>  '1010111000101110',
    'E' =>  '1110101110001010',
    'F' =>  '1011101110001010',
    'G' =>  '1010100011101110',
    'H' =>  '1110101000111010',
    'I' =>  '1011101000111010',
    'J' =>  '1010111000111010',
    'K' =>  '1110101010001110',
    'L' =>  '1011101010001110',
    'M' =>  '1110111010100010',
    'N' =>  '1010111010001110',
    'O' =>  '1110101110100010',
    'P' =>  '1011101110100010',
    'Q' =>  '1010101110001110',
    'R' =>  '1110101011100010',
    'S' =>  '1011101011100010',
    'T' =>  '1010111011100010',
    'U' =>  '1110001010101110',
    'V' =>  '1000111010101110',
    'W' =>  '1110001110101010',
    'X' =>  '1000101110101110',
    'Y' =>  '1110001011101010',
    'Z' =>  '1000111011101010',
    '-' =>  '1000101011101110',
    '.' =>  '1110001010111010',
    ' ' =>  '1000111010111010',
    '*' =>  '1000101110111010',
    '$' =>  '1000100010001010',
    '/' =>  '1000100010100010',
    '+' =>  '1000101000100010',
    '%' =>  '1010001000100010'
  );

$string = '*101010*';
$textstring = str_replace($find, $replace, $string);

$j = 11;
$sarray = str_split($textstring, 1);
for($i = 0; $i < count($sarray); $i++)
{
    if($sarray[$i] ==  '0')
    {
        imagefilledrectangle($image, $rectangle_width * $j, 150, ($rectangle_width * $j) + 

$rectangle_width, $rectangle_height, $white);
        $j++;

}
elseif($sarray[$i] ==  '1')
{
    imagefilledrectangle($image, $rectangle_width * $j, 150, ($rectangle_width * $j) + 

$rectangle_width, $rectangle_height, $black);
        $j++;
    }
} 

imagettftext($image, 10, 0, 120, 170, $black, "Verdana", $string);

header("Content-type: image/jpeg");
imagejpeg($image);
imagedestroy($image);
?>

[bpat1434]

1.) Where is $find defined?
2.) You can't just run a simple str_replace() using the array I've given you, you have to do a replacement like I gave in the example above.

[foyer]

$find doesn't exist anymore. It has been replaced by the keys in the array replace

[Dysan]

So what needs to be changed in the code, to reflect this?

[bpat1434]

FOr one thing, where you have str_replace(...) you need to make that iterate over each character in the $string. So something like:

$barcode = '';
for($i=0; $i<strlen($string); $i++)
{
    $barcode .= $replace[$string[$i]];
}

This is essentially from my previous code....

[Dysan]

How did you work out the array values the other characters? - e.g. $, /, +, % & A-Z

[foyer]

just a guess but maybe he just randomly did it

[Dysan]

randomly worked out each value manually?
its a very good guess, as every single one is valid! 🙂

[bpat1434]

Haha 🙂

I went to your link and took that image that they show how each character would be: here.

Then I just started from the top. If it was black, I put a "1", if it was white, I put a "0".

If it was 2 black squares, I put 3 "1"s, if it was 1 black square, I put 1 "1". Same deal with the white spots.

So as an example:
There are 12 "squares" to be filled. So for the character "-" I looked in the right column, and looked at the pattern: It shows this (where [x] is a black square and [ ] is a white square):

[x][ ][ ][x][ ][x][ ][x][x][ ][x][x]

So to turn it into your 15 spot item, I turned [x][x] (and subsequently [ ][ ]) into (3) 1's or (3) 0's respectively to come up with:

100010101110111

I did that for each and every one instead of just copying what you already had. Hope that makes sense.