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// return the new URL

return $new_url;

}

We’ll leave understanding this regular expression for you as homework.

Summary

We would summarize the entire chapter right here in this paragraph, but that would be duplicate content!

Because we don’t wish to frustrate our readers, we will keep it short.

Ideally, every URL on a web site would lead to a page that is unique. Unfortunately, it is rarely possible

to accomplish this in reality. You should simply eliminate as much duplication as possible. Parameters in

URLs that do not effect significant changes in presentation should be avoided. Failing that, as in the prob-

lems posed by using breadcrumb navigation, URLs that yield duplicate content should be excluded. The

two tools in your arsenal you can use to accomplish this are

robots.txt

exclusion and meta-exclusion.

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Chapter 5: Duplicate Content

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