HttpUserAgent.php

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<?php
#require_once 'Zend/Session/Validator/Abstract.php';

class Zend_Session_Validator_HttpUserAgent extends Zend_Session_Validator_Abstract
{

    public function setup()
    {
        $this->setValidData( (isset($_SERVER['HTTP_USER_AGENT'])
            ? $_SERVER['HTTP_USER_AGENT'] : null) );
    }

    public function validate()
    {
        $currentBrowser = (isset($_SERVER['HTTP_USER_AGENT'])
            ? $_SERVER['HTTP_USER_AGENT'] : null);

        return $currentBrowser === $this->getValidData();
    }

}