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Redirecting Parameterized Affiliate URLs

It is also possible to use parameterized affiliate URLs, so long as the URLs are redirected to the “main”

URL after setting a cookie or session variable for your reference. This section presents two examples,

implementing them step-by-step in exercises.

One common theme in these presented solutions is that when a URL containing an affiliate ID is requested,

you retain the affiliate ID somewhere else, and then do a 301 redirect to the URL without the affiliate infor-

mation. The examples use the visitor ’s session to store the affiliate ID, but you may choose to use cookies

instead.

In Chapter 4 you learned that the 301 status code means “Moved permanently,” so the page you redi-

rect to is interpreted as the new permanent location of the requested page. This eliminates any potential

duplicate content problems.

Example #1

This example assumes that you have affiliate URLs that look like

http://seophp.example.com/

Products/SEO-Toolbox-C6/Link-Juice-P31.html?aff_id=987

. The URL you’re finally redirect

-

ing to is

http://seophp.example.com/Products/SEO-Toolbox-C6/Link-Juice-P31.html

.

Redirecting Keyword-Rich Affiliate URLs

1.

Open

.htaccess

and find the line that rewrites keyword-rich product URLs:

# Rewrite keyword-rich URLs

RewriteRule ^Products/.*-C([0-9]+)/.*-P([0-9]+)\.html$

i

/product.php?category_id=$1&product_id=$2 [L]

Modify this line by adding this bit to its end, like this:

# Rewrite keyword-rich URLs

RewriteRule ^Products/.*-C([0-9]+)/.*-P([0-9]+)\.html$

i

/product.php?category_id=$1&product_id=$2

&%{QUERY_STRING}

[L]

2.

Modify

product.php

like this:

<?php

// load library that handles redirects

require_once ‘include/url_redirect.inc.php’;

// start PHP session

session_start();

// save affiliate ID

if (isset($_REQUEST[‘aff_id’]))

{

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

}

// redirect requests proper keyword-rich URLs when not already there

fix_category_product_url();

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Chapter 5: Duplicate Content

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