This function allows you to embed a code 39 barcode on your pictures.

Code 39 (also known as "USS Code 39", "Code 3/9", "Code 3 of 9", "USD-3", "Alpha39", "Type 39") is a barcode symbology that can encode uppercase letters (A through Z), digits (0 through 9) and a handful of special characters like the $ sign. The barcode itself does not contain a check digit (in contrast to Code 128), but it can be considered self-checking by some, on the grounds that a single erroneously interpreted bar cannot generate another valid character. Possibly the most serious drawback of Code 39 is its low data density: It requires more space to encode data in Code 39 than, for example, in Code 128. This means that very small goods cannot be labeled with a Code 39 based barcode. However, Code 39 is still widely used and can be decoded with virtually any barcode reader.

The Code 39 (also known as 3 of 9 bar code) is a variable length, discrete, alphanumeric bar code. Its character set contains 43 meaningful characters: 0 - 9, A-Z, -, ., $, /, +, %, and space. Each character is composed of nine elements: five bars and four spaces. Three of the nine elements are wide (binary value 1), and six elements are narrow (binary value 0). An additional common character (*) is used for both start and stop delimiters.

pBarcode39($BasePath="",$EnableMOD43=FALSE);

Where :

 /* pChart library inclusions */
 include("../class/pDraw.class.php");
 include("../class/pBarcode39.class.php");
 include("../class/pImage.class.php");

 /* Create the pChart object */
 $myPicture = new pImage(700,230);

 /* Draw the background */
 $Settings = array("R"=>170, "G"=>183, "B"=>87, "Dash"=>1, "DashR"=>190, "DashG"=>203, "DashB"=>107);
 $myPicture->drawFilledRectangle(0,0,700,230,$Settings);

 /* Overlay with a gradient */
 $Settings = array("StartR"=>219, "StartG"=>231, "StartB"=>139, "EndR"=>1, "EndG"=>138, "EndB"=>68, "Alpha"=>50);
 $myPicture->drawGradientArea(0,0,700,230,DIRECTION_VERTICAL,$Settings);
 $myPicture->drawGradientArea(0,0,700,20,DIRECTION_VERTICAL,array("StartR"=>0,"StartG"=>0,"StartB"=>0,"EndR"=>50,"EndG"=>50, "EndB"=>50,"Alpha"=>80));

 /* Draw the picture border */
 $myPicture->drawRectangle(0,0,699,229,array("R"=>0,"G"=>0,"B"=>0));

 /* Write the title */
 $myPicture->setFontProperties(array("FontName"=>"../fonts/Silkscreen.ttf","FontSize"=>6));
 $myPicture->drawText(10,13,"Barcode 39 - Add barcode to your pictures",array("R"=>255,"G"=>255,"B"=>255));

 /* Create the barcode 39 object */
 $Barcode = new pBarcode39("../");

 /* Draw a simple barcode */
 $myPicture->setFontProperties(array("FontName"=>"../fonts/pf_arma_five.ttf","FontSize"=>6));
 $Settings = array("ShowLegend"=>TRUE,"DrawArea"=>TRUE);
 $Barcode->draw($myPicture,"pChart Rocks!",50,50,$Settings);

 /* Draw a rotated barcode */
 $myPicture->setFontProperties(array("FontName"=>"../fonts/Forgotte.ttf","FontSize"=>12));
 $Settings = array("ShowLegend"=>TRUE,"DrawArea"=>TRUE,"Angle"=>90);
 $Barcode->draw($myPicture,"Turn me on",650,50,$Settings);

 /* Draw a rotated barcode */
 $myPicture->setFontProperties(array("FontName"=>"../fonts/Forgotte.ttf","FontSize"=>12));
 $Settings = array("R"=>255,"G"=>255,"B"=>255,"AreaR"=>150,"AreaG"=>30,"AreaB"=>27,"ShowLegend"=>TRUE, "DrawArea"=>TRUE,"Angle"=>350,"AreaBorderR"=>70,"AreaBorderG"=>20,"AreaBorderB"=>20);
 $Barcode->draw($myPicture,"Do what you want !",290,140,$Settings);

 /* Render the picture (choose the best way) */
 $myPicture->autoOutput("pictures/example.barcode39.png");

This will draw three barcodes.