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  • PHP Validate UPC and EAN13 Barcodes

    As I couldn't find any routines to do this...

    I hacked these up in Perl an age ago... needed PHP versions so here they are (Ask if you want the Perl versions lazy..) 


    function validate_UPCABarcode($barcode)

    {

      // check to see if barcode is 12 digits long

      if(!preg_match("/^[0-9]{12}$/",$barcode)) {

        return false;

      }

      $digits = $barcode;

      // 1. sum each of the odd numbered digits

      $odd_sum = $digits[0] + $digits[2] + $digits[4] + $digits[6] + $digits[8] + $digits[10];  

      // 2. multiply result by three

      $odd_sum_three = $odd_sum * 3;

      // 3. add the result to the sum of each of the even numbered digits

      $even_sum = $digits[1] + $digits[3] + $digits[5] + $digits[7] + $digits[9];

      $total_sum = $odd_sum_three + $even_sum;

      // 4. subtract the result from the next highest power of 10

      $next_ten = (ceil($total_sum/10))*10;

      $check_digit = $next_ten - $total_sum;

    


    
  // if the check digit and the last digit of the barcode are OK return true;

      if($check_digit == $digits[11]) {

         return true;

      } 

      return false;

    }

    


    
function validate_EAN13Barcode($barcode)

    {

      // check to see if barcode is 13 digits long

      if(!preg_match("/^[0-9]{13}$/",$barcode)) {

         return false;

      }

    


    
  $digits = $barcode;

    


    
  // 1. Add the values of the digits in the even-numbered positions: 2, 4, 6, etc.

      $even_sum = $digits[1] + $digits[3] + $digits[5] + $digits[7] + $digits[9] + $digits[11];

      // 2. Multiply this result by 3.

      $even_sum_three = $even_sum * 3;

      // 3. Add the values of the digits in the odd-numbered positions: 1, 3, 5, etc.

      $odd_sum = $digits[0] + $digits[2] + $digits[4] + $digits[6] + $digits[8] + $digits[10];

      // 4. Sum the results of steps 2 and 3.

      $total_sum = $even_sum_three + $odd_sum;

      // 5. The check character is the smallest number which, when added to the result in step 4,  produces a multiple of 10.

      $next_ten = (ceil($total_sum/10))*10;

      $check_digit = $next_ten - $total_sum;

    


    
  // if the check digit and the last digit of the barcode are OK return true;

      if($check_digit == $digits[12]) {

        return true;

      } 

    


    
  return false;

    }

    topics: php, programming, source code
    5 comments