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header(‘HTTP/1.1 301 Moved Permanently’);

header(‘Location: ‘ . $proper_url);

exit();

}

}

// prepares a string to be included in an URL

function _prepare_url_text($string)

{

// remove all characters that aren’t a-z, 0-9, dash, underscore or space

$NOT_acceptable_characters_regex = ‘#[^-a-zA-Z0-9_ ]#‘;

$string = preg_replace($NOT_acceptable_characters_regex, ‘’, $string);

// remove all leading and trailing spaces

$string = trim($string);

// change all dashes, underscores and spaces to dashes

$string = preg_replace(‘#[-_ ]+#‘, ‘-‘, $string);

// return the modified string

return $string;

}

// builds a category link

function make_category_url($category_name, $category_id, $page = 1)

{

// prepare the category name for inclusion in URL

$clean_category_name = _prepare_url_text($category_name);

// build the keyword-rich URL

$url = SITE_DOMAIN . ‘/Products/‘ .

$clean_category_name . ‘-C’ . $category_id . ‘/‘;

// add page number if page is different than 1

$url = ($page == 1) ? $url : $url . ‘Page-‘ . $page . ‘/‘;

// return the URL

return $url;

}

// builds a product link

function make_category_product_url($category_name, $category_id,

$product_name, $product_id)

{

// prepare the product name and category name for inclusion in URL

$clean_category_name = _prepare_url_text($category_name);

$clean_product_name = _prepare_url_text($product_name);

// build the keyword-rich URL

$url = SITE_DOMAIN . ‘/Products/‘ .

$clean_category_name . ‘-C’ . $category_id . ‘/‘ .

$clean_product_name . ‘-P’ . $product_id . ‘.html’;

267

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

c14.qxd:c14 10:46 267

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