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// generate Google sitemap

if (($target = $_GET[‘target’]) == ‘google’)

{

echo $s->getGoogle();

}

// generate Yahoo sitemap

else if ($target == ‘yahoo’)

{

echo $s->getYahoo();

}

}

However, the

sitemap.php

script will not be referenced directly, but through rewritten URLs. You

added two entries in

.htaccess

that use mod_rewrite to rewrite requests to the Yahoo! sitemap

file (

urllist.txt

) to

sitemap.php?target=yahoo

, and requests to the Google sitemap file

(

sitemap.xml

) to

sitemap.php?target=google

. Here are the rewrite rules:

RewriteRule ^sitemap.xml$ /sitemap.php?target=google [L]

RewriteRule ^urllist.txt$ /sitemap.php?target=yahoo [L]

The case study in Chapter 14 demonstrates all types of sitemaps.

Informing Google about Updates

In general, Google does a pretty good job at reading your sitemap at intervals and taking note of any

updates; however, you can tell Google that your sitemap has changed by making a request to this URL:

http://www.google.com/webmasters/sitemaps/ping?sitemap=http://seophp.example.com/

sitemap.xml

If you load this URL with a web browser you’ll simply be informed that your sitemap has been added to

the queue, and that you should register your sitemap through

http://www.google.com/webmasters/

sitemaps

if you haven’t already (see Figure 9-3).

Figure 9-3

208

Chapter 9: Sitemaps

c09.qxd:c09 10:43 208

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