Regarding google analytics

Hi Fds,

I have a dout. i have a website in php. where 600 pages of website calls in single page where the header section wont recall for every page is it suite for seo.
2. if i have a html web site with 500 pages. i need to track through analytic should i have to paste code in each and every page
3.if i come to the above site that is php. should i have to recall the header for every page.

Please suggest how should i have to design my web site that is seo friendly.