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The

getPath()

method traces the path of a request and sets the second parameter to the final result

code subject to a limit of 10 redirections. You can use this class to audit lists of links around your site

or in a database and remove or flag dead links.

Apart from

getPath()

, the

LinkChecker

class has other useful methods as well, and the

check_

links.php

script uses them all. For example, the

getHeader()

method retrieves the header of the

URL sent as parameter. The result of this can be fed as parameter to

parseResponseCode()

, which

reads the header data and returns the HTTP status code by reading it from the header. Depending on

your requirements, an answer of 200, or a 301 or 302 that eventually leads to a 200 response, may be

acceptable.

Summary

This chapter talked about a few common technical problems that you may encounter when maintaining

your web sites. You’ve learned about the detrimental effects of unreliable web hosting providers (and

how to safely switch!), as well as the dangers of having cross-linked web sites in the same C class. You’ve

explored safe approaches to split-testing. At the end of the chapter you had your share of geek-fun, build-

ing the

LinkChecker

library. This chapter has finished covering all necessary background material. In the

next chapter you build a search engine–optimized cookie catalog. We hope you are hungry!

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Chapter 13: Coping with Technical Issues

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