C:/xampp/htdocs/moodle/lib/zend/Zend/Validate/Barcode/Upce.php

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<?php
require_once 'Zend/Validate/Barcode/AdapterAbstract.php';

class Zend_Validate_Barcode_Upce extends Zend_Validate_Barcode_AdapterAbstract
{
    protected $_length = array(6, 7, 8);

    protected $_characters = '0123456789';

    protected $_checksum = '_gtin';

    public function checkLength($value)
    {
        if (strlen($value) != 8) {
            $this->setCheck(false);
        } else {
            $this->setCheck(true);
        }

        return parent::checkLength($value);
    }
}