Professional Search Engine Optimization (Seo). Developer’s Guide to SEO

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To prevent this, the following meta tag should be added to the

<head>

section of all cloaked documents:

If you are cloaking only for a specific spider, you can use a tag like the following. (This can also be applied

for

noindex,nofollow

, as shown in Chapter 5.)

This prevents the cache from being stored or displayed to users. The

New York Times

also notably uses

this tag to prevent people from reading its content through the search engines’ cache.

Implementing Cloaking

In this upcoming exercise you’re implementing a simple cloaking library, in the form of a class named

SimpleCloak

. This class will have two functions that you can access from your web applications:

updateAll()

updates your cloaking database with search engine IP and user agent data

ipSpider()

verifies if the visitor is a search engine spider

The cloaking data is retrieved from Dan Kramer ’s

iplists.com

. Kudos to Dan to providing such a use-

ful set of data for everyone to use!

To test the

SimpleCloak

library, you’ll create a script named

cloaking_test.php

, which will have the

output shown in Figure 11-1 if read by a “normal” visitor, and the output shown in Figure 11-2 when

read by a search engine.

Figure 11-1

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Chapter 11: Cloaking, Geo-Targeting, and IP Delivery

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