In this article we will help you understand the difference between static URLs and dynamic URLs and the benefits of coding search-friendly URLs. We'll also explain why it is important to optimize URLs and how they impact search engine click through rates. We will introduce you to the basics of PHP URL structure, the mod_rewrite and how to use it to produce static-looking search engine friendly links.
The article only touches on the basics and assumes you have a general knowledge of PHP, as well as some knowledge of SEO.
Why is it Important to Optimize URLs?
In the earlier days of search engine optimization, keywords in your URL helped pages rank higher in search results. Today URLs have little or no impact on search engine rankings; however, URL optimization is still crucial for several reasons.
Keywords in URL increase your click through rate and the perceived relevancy of the result.
URLs are often cited as the anchor text, so having keywords will improve the value of inbound links.
Short, keyword-rich URLs are easier to remember.
Most importantly, optimized PHP URLs prevent duplicate content and help search engine spiders crawl better.
Search Optimization 
