Gig Cable Label: Generate label images in resistors code colours

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Version License PHP version Categories
gig-cables-code 1.0GNU Lesser Genera...5.3HTML, PHP 5, Graphics, Printing
Description Author

This class can generate label images for color coded resistors.

It takes the resistance value of an electric resistor and generates an image for a page with a grid of labels that show the resistance value with the respective color code stripes, as well QR-code for the same for associated values.

The class can generate the label images. The generated images are saved to a file in the PNG format and are embedded in the generated page HTML.

It may also return a JSON encoded object with the label image dimensions and image data encoded in base64.

The size of the page and the number of labels in the grid are configurable parameters.


What is the best PHP qr code generation class?
I need php code to generate qr code offline

Innovation Award
PHP Programming Innovation award nominee
July 2012
Number 4
Resistors are components used frequently in electronic devices. They usually have color coded stripes that tell what is the resistance value of the resistor.

This class can generate labels suitable for printing that use the same color coded stripes used in resistors.

Manuel Lemos
Picture of Karl Holz
  Performance   Level  
Name: Karl Holz <contact>
Classes: 14 packages by
Country: Canada Canada
Age: 39
All time rank: 50119 in Canada Canada
Week rank: 38 1 in Canada Canada
Innovation award
Innovation award
Nominee: 9x

# GigCableLabel

I currently work as a Tech in the Staging and AV world with various companies and I have noticed that many companies don't really follow a single industry standard for labeling their many cables, cases, lighting, audio, etc.  I wrote this program to help solve a problem that can help companies adopt a single standard for color coded labeling based on the resister colour code for 0-9.  The numeric codes are a maximum of 3 characters 0-9 and a letter for meters or feet.  QR code generation is placed beside the colour coded label.

### The generated QR code can contain:

- E-mail address
- Phone Number 
- Address VCARDS
- Calendar Event
- Custom Text

QR codes have many uses for inventory, logistics, documentation, manifests or usage instructions to name a few.  I'm just tired of wasting my time looking for the right size cable when they are all labeled
differently or not at ALL! on a job site.  An example of the dilemma I would face when looking for a 50 foot cable; which cable is more likely to be a 50 ft cable marking that is clear? 

- The one with the red label?
- The one with the white label?
- The one with the yellow label? 
- Green and Black label?

In the resistor code, Green is 5 and Black is 0; so what do you think makes the most sence when hiring many freelancers and/or techs/hands from labour companies?  The resistor code is the winner, but most are stuck in their old ways


The QR code generation is from [phpqrcode](, this works very well and can be turned off in the class (not in the demo).  The QR code size (1 to 40) will be set based on the input string length and ECC level, all the maximum alphanumeric lengths I test against are listed on this [site]( (link to page 4/4).  I've noticed that stretched QR code images don't work with Norton Snap on my iPhone 4, test your labels before you print any. I have 2 iPhone Apps for testing QR codes, Norton Snap and QRdeCODE. 

### The Demo:

The GigCableLabel demo will demonstrate this class in a RESTful Setup with PHP 5.3 and jQuery.  GET the label, PUT the label in the project directory, DELETE the selected labels from the project directory and POST a new project for labels.  There is still more work todo to make this tool a success, the UI is still very beta, view the [Demo](  

- double click the new label to clear the new image and close the window or drag and drop the label on the project window to save it.
- added some multilingual support, English and goggle translated French, Arabic will be next -- Inshallah.
- I have also added Arabic Number labels, but with an English UI
- Multiple projects are now supported for multiple shows, shops, etc and can be made and loaded dynamically.
- Most of the web apps text has been moved into ini text files and loaded as a single JSON object, making it easier to edit and add translations
- added support for custom label sizes and page layout

### A look at the giglabel.php as an example of how to use this class can be used.

    /* Gig Cable Label Class demo */
    /* HTTP/1.0 2XX Success Pages */
    function success_201($url) {
      header("HTTP/1.0 201 Created");
      header("Location: ".$url);

    /* HTTP/1.0 4XX Error Pages */
    function error_400() {
     header("HTTP/1.0 400 Bad Request");
     $http['header']="HTTP/1.0 400 Bad Request";
     $http['msg']="This request failed to load this resource";
     echo json_encode($http);

    function error_403($msg='') {
     header("HTTP/1.0 403 Forbidden");
     $http['header']="HTTP/1.0 403 Forbidden";
     if ($msg=='' || !is_string($msg)) {
      $http['msg']="You're not allowed to request this resource this way "; 
     } else {
     echo json_encode($http);

    function error_404() {
     header("HTTP/1.0 404 Not Found");
     $http['header']="HTTP/1.0 404 Not Found";
     $http['msg']="Couldn't find the requested resource";
     echo json_encode($http);

    function error_405() {
     header("HTTP/1.0 405 Method Not Allowed");
     $http['header']="HTTP/1.0 405 Method Not Allowed";
     $http['msg']="You're not allowed to do this type of request on this resource";
     echo json_encode($http);

    function error_410() {
     header("HTTP/1.0 410 Gone");
     $http['header']="HTTP/1.0 410 Gone";
     $http['msg']="This Resource is gone";
     echo json_encode($http);

    function error_412() {
     header("HTTP/1.0 412 Precondition Failed");
     $http['header']="HTTP/1.0 412 Precondition Failed";
     $http['msg']="couldn't create/update the resource, try again";
     echo json_encode($http);

    function error_413() {
     header("HTTP/1.0 413 Request Entity Too Large");
     $http['header']="HTTP/1.0 413 Request Entity Too Large";
     $http['msg']="You're discription is too large for this resource<br />- Consider lowering the Error Correction Capability ";
     echo json_encode($http);
    /* HTTP application/json header */
    function json_header() {
      header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); 
      header("Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . "GMT"); 
      header("Cache-Control: no-cache, must-revalidate"); 
      header("Pragma: no-cache");
      header("Content-type: application/json");
    /* Genarates an UUID
     * @author Anis uddin Ahmad <>
     * @link
     * @param      string  an optional prefix
     * @return     string  the formated uuid
    function uuid($key = null, $prefix ='QR') {
        $key = ($key == null)? 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'] : $key;
        $chars = md5($key);
        $uuid  = substr($chars,0,8) . '-';
        $uuid .= substr($chars,8,4) . '-';
        $uuid .= substr($chars,12,4) . '-';
        $uuid .= substr($chars,16,4) . '-';
        $uuid .= substr($chars,20,12);
        return $prefix .'-'. $uuid;

    require_once 'gigcablelabel.class.php';
    // view switcher
    if     (array_key_exists('ORIG_PATH_INFO', $_SERVER)) { $rest=$_SERVER['ORIG_PATH_INFO']; }
    elseif (array_key_exists('PATH_INFO', $_SERVER)) { $rest=$_SERVER['PATH_INFO']; } else { $rest=''; }
    // imgdata
    if  (array_key_exists('QUERY_STRING', $_SERVER)) { $imgdata=$_SERVER['QUERY_STRING']; } 
    else { $imgdata=''; }
    // RESTful CRUD access switcher
    if  (array_key_exists('REQUEST_METHOD', $_SERVER)) { $method=$_SERVER['REQUEST_METHOD']; } 
    else { $method=''; }

    $webdir=str_replace($_SERVER['DOCUMENT_ROOT'], '', dirname(__FILE__));

    if ($rest) {
     $r=explode('/', $rest);
     array_shift($r); // drop blank before /
     switch ($page) {
        case 'feed':
         // Make dir
         if($method == 'POST') {
          $post=json_decode($p, true);
          if (!array_key_exists('project', $post)) error_403();
          if (!ctype_alnum($post['project'])) error_403();
          if (!is_dir($dir)) mkdir(trim($dir), 0750, true);
         } else {
          if ($p == '') error_400();
          if (!ctype_alnum($p)) error_403();
          if (!is_dir($dir)) error_404();

         if($method == 'DELETE') {
           if (in_array($f, $d)) {
            if (is_file($f)) { unlink($f); } else { error_410(); }
           } else { error_404(); }
         if ($method == 'PUT') {
          $file=json_decode($j, true);
          if (! array_key_exists('code',$file) && !ctype_alnum ($file['code'])) error_404();
          if (! array_key_exists('width',$file) && !ctype_alnum ($file['width'])) error_404();
          if (! array_key_exists('height',$file) && !ctype_alnum ($file['height'])) error_404();
          if (! array_key_exists('x',$file) && !is_numeric($file['x'])) error_404();
          if (! array_key_exists('y',$file) && !is_numeric($file['y'])) error_404();

          $name=$dir."/".str_replace(':', '|', $file['published']).".json";
          $file['url']='http://'.$_SERVER['HTTP_HOST'].$webdir.trim($name, '.');
          $file['id']=uuid($name, $file['code']);
          $json=json_encode($file, JSON_ERROR_SYNTAX);
          if (! file_put_contents( $name, $json)) { error_412(); }
          echo $json;
         } elseif($method == 'DELETE' || $method == 'GET' || $method == 'POST') {
          $id=uuid($uri, 'atom');
          foreach ($j as $c) {
           $link='http://'.$_SERVER['HTTP_HOST'].$webdir.urlencode(trim($c, '.'));
           $json=json_decode($f, true);
          echo json_encode($proj);
         } else { error_405(); }
        case 'ui.json': GigCableLabel::load_ui($imgdata); break;
        case 'print':
         GigCableLabel::print_page($width, $height,$x,$y,$img_style,$imgdata) || error_404();    
        //case 'label':
        //    $code=array_shift($r);
        //    if (!ctype_alnum ($code)) error_404();
        //    $label=new GigCableLabel($code);
        //    $label->make_label();    
        case 'QR':
            if (! ctype_upper($lvl)) error_404();
            if (!ctype_alnum ($code)) error_404();
            $desc=trim(implode('//', $r), '/');
            $label=new GigCableLabel($code);
            if ($label->desc=trim($desc)) {
            } else { error_413(); }
    //$label=new GigCableLabel();       
### Thanks

- For creating the Arabic Images i took a look at the [ArGlyphs class]( by a brother from Syria - Khaled Al-Shamaa 
- It showed me how to use a ttf font file for creating UNICODE text images in GD images with imagettftext; imagestring was making the text too small.
  • output
  • new-ui-july13.png
File Role Description
css (2 files, 1 directory)
GigCableLabel (8 files)
js (4 files)
phpqrcode (19 files, 3 directories)
gigcablelabel.class.php Class Class that generates the png images from numeric strings
giglabel.php Example Gig Cable label as web service, Accepts GET,POST,PUT and DELETE HTTP methods on select resources
index.html Doc. REST client to giglabel.php
licence.txt Lic. Documentation
NewGigCableLabel.png Data newer screen shot
README.txt Doc. Documentation

  Files  /  css  
File Role Description
images (12 files)
   qr.css Data Custom CSS
   style.css Data jquery ui css

  Files  /  css  /  images  
File Role Description
   ui-bg_diagonals-th...48_1e158e_40x40.png Icon Icon image
   ui-bg_diamond_75_09810b_10x8.png Icon Icon image
   ui-bg_dots-medium_55_fbf9ee_4x4.png Icon Icon image
   ui-bg_dots-medium_95_fef1ec_4x4.png Icon Icon image
   ui-bg_hexagon_65_4c7d0d_12x10.png Icon Icon image
   ui-bg_hexagon_75_1727d9_12x10.png Icon Icon image
   ui-bg_hexagon_75_2d5841_12x10.png Icon Icon image
   ui-bg_loop_0_1f08bf_21x21.png Icon Icon image
   ui-bg_loop_30_7ea276_21x21.png Icon Icon image
   ui-icons_2e83ff_256x240.png Icon Icon image
   ui-icons_cd0a0a_256x240.png Icon Icon image
   ui-icons_ffffff_256x240.png Icon Icon image

  Files  /  GigCableLabel  
File Role Description
   data.ini Data class config file
   north_america.ini Data resister code colours
   ui-department.ini Data UI Config
   ui-level.ini Data UI Config
   ui-page_size.ini Data UI Config
   ui-type.ini Data UI Config
   ui-unit.ini Data UI Config
   ui.ini Data UI Config

  Files  /  js  
File Role Description
   jquery-1.7.2.min.js Data jquery
   jquery-ui-1.8.21.custom.min.js Data jquery ui
   json2.js Data jquery json
   qr-label.js Data custom jquery for loading label preview

  Files  /  phpqrcode  
File Role Description
bindings (1 directory)
cache (40 files)
tools (5 files)
   CHANGELOG Data phpqrcode files needed by class for QR codes
   index.php Example phpqrcode files needed by class for QR codes
   INSTALL Doc. phpqrcode files needed by class for QR codes
   LICENSE Lic. phpqrcode files needed by class for QR codes
   phpqrcode.php Example phpqrcode files needed by class for QR codes
   qrbitstream.php Example phpqrcode files needed by class for QR codes
   qrconfig.php Conf. phpqrcode files needed by class for QR codes
   qrconst.php Example phpqrcode files needed by class for QR codes
   qrencode.php Example phpqrcode files needed by class for QR codes
   qrimage.php Example phpqrcode files needed by class for QR codes
   qrinput.php Example phpqrcode files needed by class for QR codes
   qrlib.php Example phpqrcode files needed by class for QR codes
   qrmask.php Example phpqrcode files needed by class for QR codes
   qrrscode.php Example phpqrcode files needed by class for QR codes
   qrspec.php Example phpqrcode files needed by class for QR codes
   qrsplit.php Example phpqrcode files needed by class for QR codes
   qrtools.php Example phpqrcode files needed by class for QR codes
   README Data phpqrcode files needed by class for QR codes
   VERSION Data phpqrcode files needed by class for QR codes

  Files  /  phpqrcode  /  bindings  
File Role Description
tcpdf (1 file)

  Files  /  phpqrcode  /  bindings  /  tcpdf  
File Role Description
   qrcode.php Example Example script

  Files  /  phpqrcode  /  cache  
File Role Description
   frame_1.png Icon Icon image
   frame_10.png Icon Icon image
   frame_11.png Icon Icon image
   frame_12.png Icon Icon image
   frame_13.png Icon Icon image
   frame_14.png Icon Icon image
   frame_15.png Icon Icon image
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   frame_2.png Icon Icon image
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   frame_22.png Icon Icon image
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   frame_25.png Icon Icon image
   frame_26.png Icon Icon image
   frame_27.png Icon Icon image
   frame_28.png Icon Icon image
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   frame_3.png Icon Icon image
   frame_30.png Icon Icon image
   frame_31.png Icon Icon image
   frame_32.png Icon Icon image
   frame_33.png Icon Icon image
   frame_34.png Icon Icon image
   frame_35.png Icon Icon image
   frame_36.png Icon Icon image
   frame_37.png Icon Icon image
   frame_38.png Icon Icon image
   frame_39.png Icon Icon image
   frame_4.png Icon Icon image
   frame_40.png Icon Icon image
   frame_5.png Icon Icon image
   frame_6.png Icon Icon image
   frame_7.png Icon Icon image
   frame_8.png Icon Icon image
   frame_9.png Icon Icon image

  Files  /  phpqrcode  /  tools  
File Role Description
   merge.bat Data Auxiliary data
   merge.php Example Example script Data Auxiliary data
   merged_config.php Example Example script
   merged_header.php Example Example script

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