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{

$new_query_string .= ($new_query_string == ‘’ ? ‘?’ : ‘&‘)

. urlencode($name) . ‘=’ . urlencode($value);

}

}

// return the URL that doesn’t contain $param

return $url_path . $new_query_string;

}

?>

2.

In your

seophp

folder, create a new script named

aff_test.php

and type the following code:

<?php

// include URL utils library

require_once ‘include/url_utils.inc.php’;

// load configuration script

require_once ‘include/config.inc.php’;

// start PHP session

session_start();

// redirect affiliate links

if (isset($_REQUEST[‘aff_id’]))

{

// save the affiliate ID

$_SESSION[‘aff_id’] = $_REQUEST[‘aff_id’];

// obtain the URL with no affiliate ID

$clean_url = SITE_DOMAIN . remove_query_param($_SERVER[‘REQUEST_URI’], ‘aff_id’);

// 301 redirect to the new URL

header(‘HTTP/1.1 301 Moved Permanently’);

header(‘Location: ‘ . $clean_url);

}

// display affiliate details

echo ‘You got here through affiliate: ‘;

if (!isset($_SESSION[‘aff_id’]))

{

echo ‘(no affiliate)‘;

}

else

{

echo $_SESSION[‘aff_id’];

}

?>

3.

Load

http://seophp.example.com/aff_test.php

and expect to get the results displayed in

Figure 5-3.

113

Chapter 5: Duplicate Content

c05.qxd:c05 10:41 113

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