base_url and port number

This code is from CI manual, with some changes

PHP Code:

// change your domain below
$allowed_domains = array('domain1.tld', 'domain2.tld');
$default_domain  = 'domain1.tld';

if (in_array($_SERVER['HTTP_HOST'], $allowed_domains, TRUE))
{
        $domain = $_SERVER['HTTP_HOST'];
}
else
{
        $domain = $default_domain;
}

// get server port
$port = $_SERVER['SERVER_PORT'];

if ( ! empty($_SERVER['HTTPS']))
{
        $config['base_url'] = 'https://'.$domain.':'.$port.'/appname/';
}
else
{
        $config['base_url'] = 'http://'.$domain.':'.$port.'/appname/';
}