EAN-13 barcodes

Add-On EAN-13 barcodes

Informations

Author:Olivier
License: FPDF

Description

This script implements EAN-13 and UPC-A barcodes (the second being a particular case of the first one). Bars are drawn directly in the PDF (no image is generated).

EAN13(float x, float y, string barcode [, float h [, float w]])

x: abscissa of barcode.
y: ordinate of barcode.
barcode: value of barcode.
h: height of barcode. Default value: 16.
w: width of a bar. Default value: 0.35.

UPC_A(float x, float y, string barcode [, float h [, float w]])

Same parameters.

An EAN-13 barcode is made up of 13 digits, UPC-A of 12 (leading zeroes are added if necessary). The last digit is a check digit; if it's not supplied, it will be automatically computed.

Source

<?php
require('fpdf.php');

class PDF_EAN13 extends FPDF
{
function EAN13($x, $y, $barcode, $h=16, $w=.35)
{
    $this->Barcode($x, $y, $barcode, $h, $w, 13);
}

function UPC_A($x, $y, $barcode, $h=16, $w=.35)
{
    $this->Barcode($x, $y, $barcode, $h, $w, 12);
}

function GetCheckDigit($barcode)
{
    //Compute the check digit
    $sum=0;
    for($i=1;$i<=11;$i+=2)
        $sum+=3*$barcode[$i];
    for($i=0;$i<=10;$i+=2)
        $sum+=$barcode[$i];
    $r=$sum%10;
    if($r>0)
        $r=10-$r;
    return $r;
}

function TestCheckDigit($barcode)
{
    //Test validity of check digit
    $sum=0;
    for($i=1;$i<=11;$i+=2)
        $sum+=3*$barcode[$i];
    for($i=0;$i<=10;$i+=2)
        $sum+=$barcode[$i];
    return ($sum+$barcode[12])%10==0;
}

function Barcode($x, $y, $barcode, $h, $w, $len)
{
    //Padding
    $barcode=str_pad($barcode, $len-1, '0', STR_PAD_LEFT);
    if($len==12)
        $barcode='0'.$barcode;
    //Add or control the check digit
    if(strlen($barcode)==12)
        $barcode.=$this->GetCheckDigit($barcode);
    elseif(!$this->TestCheckDigit($barcode))
        $this->Error('Incorrect check digit');
    //Convert digits to bars
    $codes=array(
        'A'=>array(
            '0'=>'0001101', '1'=>'0011001', '2'=>'0010011', '3'=>'0111101', '4'=>'0100011', 
            '5'=>'0110001', '6'=>'0101111', '7'=>'0111011', '8'=>'0110111', '9'=>'0001011'), 
        'B'=>array(
            '0'=>'0100111', '1'=>'0110011', '2'=>'0011011', '3'=>'0100001', '4'=>'0011101', 
            '5'=>'0111001', '6'=>'0000101', '7'=>'0010001', '8'=>'0001001', '9'=>'0010111'), 
        'C'=>array(
            '0'=>'1110010', '1'=>'1100110', '2'=>'1101100', '3'=>'1000010', '4'=>'1011100', 
            '5'=>'1001110', '6'=>'1010000', '7'=>'1000100', '8'=>'1001000', '9'=>'1110100')
        );
    $parities=array(
        '0'=>array('A', 'A', 'A', 'A', 'A', 'A'), 
        '1'=>array('A', 'A', 'B', 'A', 'B', 'B'), 
        '2'=>array('A', 'A', 'B', 'B', 'A', 'B'), 
        '3'=>array('A', 'A', 'B', 'B', 'B', 'A'), 
        '4'=>array('A', 'B', 'A', 'A', 'B', 'B'), 
        '5'=>array('A', 'B', 'B', 'A', 'A', 'B'), 
        '6'=>array('A', 'B', 'B', 'B', 'A', 'A'), 
        '7'=>array('A', 'B', 'A', 'B', 'A', 'B'), 
        '8'=>array('A', 'B', 'A', 'B', 'B', 'A'), 
        '9'=>array('A', 'B', 'B', 'A', 'B', 'A')
        );
    $code='101';
    $p=$parities[$barcode[0]];
    for($i=1;$i<=6;$i++)
        $code.=$codes[$p[$i-1]][$barcode[$i]];
    $code.='01010';
    for($i=7;$i<=12;$i++)
        $code.=$codes['C'][$barcode[$i]];
    $code.='101';
    //Draw bars
    for($i=0;$i<strlen($code);$i++)
    {
        if($code[$i]=='1')
            $this->Rect($x+$i*$w, $y, $w, $h, 'F');
    }
    //Print text uder barcode
    $this->SetFont('Arial', '', 12);
    $this->Text($x, $y+$h+11/$this->k, substr($barcode, -$len));
}
}
?>

Example

<?php
require('ean13.php');

$pdf=new PDF_EAN13();
$pdf->AddPage();
$pdf->EAN13(80, 40, '123456789012');
$pdf->Output();
?>

View the result here.

Download

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