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6.

Load

http://seophp.example.com/urllist.txt.

You should get a Yahoo! sitemap, as

shown in Figure 9-2.

Figure 9-2

The

Sitemap

class creates both Yahoo! and Google sitemap formats via the same class interface. To use

it, you first create an object of the class

Sitemap

, then use the

addItem()

method to add each of your

URLs. That’s what you do in

sitemap.php

:

// create the Sitemap object

$s = new Sitemap();

// add sitemap items

$s->addItem(SITE_DOMAIN . ‘/catalog.html’, ‘2006/10/27’, ‘weekly’);

$s->addItem(make_category_product_url(

“Carpenter’s Tools”, 12, “Belt Sander”, 45), ‘2006/10/27’, ‘weekly’);

$s->addItem(make_category_product_url(

“SEO & Toolbox”, 6, “Link Juice”, 31), ‘2006/10/27’, ‘weekly’);

$s->addItem(make_category_product_url(

“Friends’ Shed”, 2, “AJAX PHP Book”, 42), ‘2006/10/27’, ‘weekly’);

Note that you use the

make_category_product_url()

function from the URL factory to obtain proper

URLs. In a real example, the information provided to this function would be pulled from records in a

database, and not specified directly in application code. But this example again illustrates how using

the URL factory eases programming and enhances consistency.

The last modified date, change frequency, and priority should be provided in the formats elicited by

Google sitemaps. These fields are not included in the Yahoo! sitemap. To create the sitemaps, simply

call the

getGoogle()

or

getYahoo()

methods of the

Sitemap

class, respectively. Your

sitemap.php

script calls one of these methods depending on the value of the

target

query string parameter:

// output sitemap

if (isset($_GET[‘target’]))

{

207

Chapter 9: Sitemaps

c09.qxd:c09 10:43 207

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