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

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Figure 14-5

When it comes to the code, you’ll find most of it familiar from the previous chapters. This section focuses

only on the new details.

The functions you’re using to display catalog data are located in the

catalog.inc.php

file. There you

can find the

Brands

Categories

, and

Products

classes — each of these classes have a method called

get()

. The various parameters of

get()

allow you to either retrieve the complete list of brands, cate-

gories, and products, or to filter the results according to various criteria.

The

get()

methods return an associate array with the query results. If you’re expecting a single result,

then you need to read the first element of the returned array. Take the following example, which uses

Products::get()

to retrieve the details of a single product:

// retrieve the product details

$product_id = $_GET[‘product_id’];

$products = Products::get($product_id);

$product = $products[0];

You can see the same function called in

category.php

to retrieve all the products in a category, like this:

// retrieve the products in the category

$products = Products::get(0, $category_id);

The other new material in this chapter is the implementation of the pager library. This library, located in

simple_pager.inc.php

, contains the basic functionality for displaying a pager. You use this function-

ality in the category pages, where you want to display a limited number of products per page. You can

set the number of products by editing the

PRODUCTS_PER_PAGE

constant in

config.inc.php

. For the

purposes of this test this value is set to 1, but feel free to change it to any value:

// defines the number of products for paging

define(‘PRODUCTS_PER_PAGE’, 1);

A number of settings related to the pager are hard-coded in the constructor of the

SimplePager

class —

depending on how flexible you want this functionality to be, you may want to make these configurable.

Also, in a professional implementation you would need to add support for including CSS styles in the

pager output.

products

PK id

brand_id

name

price

desc

primary_category_id

brands

name