Search engine optimization is not only the job of a marketing staff. It must be considered from a web site's inception and throughout its lifetime by the web site developer. Professional Search Engine Optimization with PHP provides developers with the information they need to create and maintain a search engine friendly web site, and avoid common pitfalls that confuse search engine spiders. The book discusses in depth how to to facilitate site spidering, and discusses the various technologies and services that can be leveraged for site promotion.