PHP is the server side scripting language that spits out HTML so the SEO implications are exactly the same. The only things you might want to consider are ensuring you don't have session id's on the url don't have a parameter that googlebot might mistake for a session id don't have more than three parameters in a page name.
Chuck the site in your signature here and googlebot will be along any second. Check your logs - I'm sure it's visiting - there is a difference between doing well in the SERPs and being indexed. If you want to check your status you can always sign up to the webmaster tools at https://www.google.com/webmasters/tools/, verify your site and wait a few days. Google will then tell you if it has any issues.
if you have completed the optimization and google does not crawl your site, you must be sure that you dont prevent google to crawl your site (robots.txt file and meta tags). and continue to build backlink