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Finally, you use

preg_replace()

once again to transform any groups of spaces, dashes, and underscores

to dashes. For example, a string such as

SEO___Toolbox

(note there are three underscores) would be

replaced to

SEO-Toolbox

. Then you return the transformed URL string:

// change all dashes, underscores and spaces to dashes

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

// return the modified string

return $string;

Here are some examples of this transformation:

// displays Carpenters-Tools

echo _prepare_url_text(“Carpenter’s Tools”);

// displays Black-And-White

echo _prepare_url_text(“Black and White”);

_prepare_url_text()

is used by

make_category_product_url()

to create product URLs. The

make_category_product_url()

function receives as parameters a category name, a product name,

a category ID, and a product ID, and it uses this data to create the keyword-rich URL. The code in this

function is pretty straightforward. It starts by using

_prepare_url_text()

to prepare the product and

category names for inclusion in a URL:

// builds a link that contains a category and a product

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);

Then it simply joins strings to create a string of the form

./Products/

Category

-

Name

-C

m

/

Product

-

Name

/P

n

.html

. Finally, it returns this string:

// build the keyword-rich URL

$url = ‘./Products/‘ .

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

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

// return the URL

return $url;

}

Here are some examples of this function’s use, and the results:

// display /Products/Carpenters-Tools-C12/Belt-Sander-P45.html

echo make_product_url(“Carpenter’s Tools”, 12, ‘Belt Sander’, 45);

// display /Products/Hammers-C3/Big-and-Mighty-Hammer-P4.html

echo make_product_url(‘Hammers’, 3, ‘Big and Mighty Hammer’, 4);

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Chapter 3: Provocative SE-Friendly URLs

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