Use PHP to Build a Search Engine Optimization Application
http://www-128.ibm.com/developerworks/edu/os-dw-os-php-seo1.html

Anderson, Tyler
IBM
2006

Abstract:

PHP, a dynamic Web-based programming language, takes a variety of input formats and uses a built-in SOAP client to obtain information from the Web. PHP, combined with applications using search engine optimization (SEO), is a powerful tool for obtaining information from major search engines, allowing this information to guide a webmaster's online marketing and SEO strategies.