PHP and SEs

What are the common pitfalls?

[aaronjf]

In resent history Search Engines had extreme difficulty indexing dynamic sites. To a large degree this has been over come, but there are still problems. Specifically I am trying to find out how PHP effects SEs today. What would you consider to be the most common pitfalls PHP based CMS and cart systems have relative to Search Engines? What will stop a Search Engine dead in its tracks?

[jatar_k]

I still don't believe that SE's spider long nasty urls very well at all. Static looking url's are always better.

Session id's are an issue.

Most carts and CMS systems are made by people who have no understanding of Search Engines or marketing of any kind. It has nothing to do with PHP, it is just foolish programmers.

[aaronjf]

Would you consider the following to be easily spidered if this url was leading to a products page:

www.SomeWidgetStore.com/cart/product_info.php?pid=438

[jatar_k]

I would rather rewrite it to

www.SomeWidgetStore.com/cart/product_info/438.html