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14.

Load

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

. Because you’re not a search

engine, you will be shown the picture of Tweety and Sylvester, as shown in Figure 11-1.

15.

The simplest way to test what happens if you’re a search engine is to add your local IP to the

simple_cloak

table. Use either the MySQL console or phpMyAdmin to connect to the

seophp

database, and execute this query:

INSERT INTO cloak_data (spider_name, record_type, value)

VALUES (‘localtest’, ‘IP’, ‘127.0.0.1’)

16.

Load

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

again. This time the script will

think you’re a search engine, and will output the text “Tweety and Sylvester” instead of the

picture, as shown in Figure 11-2.

Implementing cloaking is basically a three-step process.

First, you needed to prepare the cloaking database and the cloaking library. The

cloak_data

table stores

data about search engine IPs and user agents, and the

cloak_update

table stores data about the last data-

base update. You use this latter table to store the time and version of your last update.

The

SimpleCloak

class contains two methods that you can use in your programs:

updateAll()

and

isSpider()

. The

updateAll()

method retrieves data from

www.iplists.com

and saves it into the

local database — but not more often than once a week, and only when the version information retrieved

from

www.iplists.com

is different than that stored in your

cloak_update

table.

In the pages that need to implement cloaking, you use

SimpleCloak::isSpider()

, which returns a

positive number representing the “confidence” it has in the request being that of a spider. The confi-

dence has one of these values:

?

0 if neither the user agent nor the IP match that of a spider

?

2 if the user agent is that of a spider

?

3 if the IP address is that of a spider

?

5 if both the IP address and the user agent are that of a spider

In this example, you verified that the value is greater or equal than 3 to ensure that the IP address is

from a spider. Also, note that

isSpider()

may optionally receive a number of optional parameters,

which you can use to have it verify if the visitor is a particular spider, and/or check only the user

agent or the IP address.

Cloaking Case Studies

Following are a few typical scenarios where cloaking could be used:

?

Rendering text images as text

?

Redirecting excluded content to a non-excluded equivalent

232

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

c11.qxd:c11 11:01 232

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