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// constructor

function SimplePager($rows, $limit, $function_callback,

$page_number_parameter_index = 1)

{

$this->_rows = $rows;

$this->_limit = $limit;

$this->_function_callback = $function_callback;

$this->_page_number_parameter_index = $page_number_parameter_index;

$this->_max_listed_pages = 10;

$this->_previous_prompt = ‘<< back’;

$this->_next_prompt = ‘next >>’;

}

Once this library is in place, it’s fairly easy to use it, provided that the other parts of your web site are

aware of your paging feature. For example, you have a mod_rewrite rule in

.htaccess

to handle cate-

gory URLs that contain a pager parameter. The

make_category_url()

function of the URL factory also

takes an optional

$page

parameter, and uses it to add the page to the category link if

$page

is different

than 1.

The place where you use the pager is

category.php

:

// use the SimplePager library to display the pager

$simple_pager = new SimplePager($products, PRODUCTS_PER_PAGE, ‘make_category_url’);

echo $simple_pager->display($page, $products, array($category_name, $category_id));

As you see, first you need to create a

SimplePager

instance, providing as parameters the complete list

of items the page needs to display, and number of items per page, and the function that creates links to

the individual pages (in this case, that is

make_category_url

).

After creating the instance, you call its

display()

function, providing as parameters the current page,

the list of items, and the parameters to send to the function specified when creating the

SimplePager

instance. In this case,

make_category_url()

needs to know the

$category_name

and

$category_id

in order to create the category links. The page number parameter is added by your library.

The final technical aspect we need to highlight is the fact that your catalog can contain the same product

in more categories, and you can view its details with different URLs for each of those categories. As you

know, this generates duplicate content. To avoid duplicate content problems each product has a primary

category (identified by the

primary_category_id

column in the

products

table), and you eliminate

all the product URLs except the one associated with the primary category, in

robots.txt

. For example,

if you look at Figure 14-4, you’ll see that two Frosted Fortune Cookie URLs are mentioned. The third

one, which doesn’t appear there, is that of the primary category.

Summary

We hope you’ve had fun developing Cookie Ogre’s Warehouse! Even though the implemented function-

ality is very simplistic, it did demonstrate how to tie together the bits and pieces of code you met in

the previous chapters of the book. At this point your journey into the world of technical search engine

optimiza

tion is almost complete. In the next chapter you’ll meet a checklist of details to look after when

improving the search engine friendliness of an existing site.

281

Chapter 14: Case Study: Building an E-Commerce Store

c14.qxd:c14 10:46 281

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