Trying to get a conceptual understanding. I know it's dynamic and server side. And when your browser goes to a PHP site, it's served. I looked it up on Google and found that movie "You Got Served" where break dancers fly around in the air? Also trying to get the concept of SEO and how plugins allow dyanmic pages like domain.com/index.php=045sldf3=x45=463 to instead look like domain.com/you_just_got_served/ to look like a permanent URL. so if someone bookmarks something, anytime they call to your site database, the database instantly whips them up a dynamic page right? Also, if the database is serving them with a page every time it's queried in the search engines, then wouldn't that page always be new and created that day and time and never be out dated? How does the search engines know, or does it cross compare to what it has cached on their server? In the old days of HTML, we could just simply look at the properties and view the created and last modified date.
You can install a software in your server that it could change the url automatic. Also, you can make a php program which could create *.htm document. Maybe you don't know how search engine works. It only connect your website once when it update your site, and then record your site. When users seach, it list the records which it collected last time. If you don't understand or want to learn more about SEO , you can PM me everybody welcome
you could use php codes at the meta header of the dynamic pages in your php files, that meta data will came from database