Just a quick question on PHP generated pages and search engines....

I'm putting a site together that contains a lot of data pulled off of a mySQL database by PHP.

I understand that the search engine bots that crawl around look at a number of factors, but when they find a page with very little html to 'read', what happens?

Because the html code isn't created until the page is loaded (when the PHP script runs to create the html), does that mean that the bot doesn't pick up on the php generated content?