I'm running my site on Wordpress. I want to convert it to PHP. I just want to ask you if I convert it to PHP then their is any decline in my Search engine ranking. Although my site is new and not ranking in search engine but I want to know if it will hurt me or it will be good for me. My site is located here
Learning php takes some time, also since your web page is a blog you will have to learn some of SQL. I recommend you to use a php framework like symfony or zend. It is hard in the beginning but you will get results at the end..
Well, WordPress is already PHP, so we may need more info on what you actually intend to change.
If your site is new and does not have a ranking then there is no problem in shifting your site to wordpress.