dynamic or static urls?

does anyone know which is better for SEO rankings? Dynamic or Static?

example:

http://www.blah.com开发者_StackOverflow社区/this_page.php?id=1234 ( half dynamic cause of the id that changes but everything else stays )

versus

http://www.blah.com/totally_dynamic_changing_all_the_time.php

The second one is more SEO-friendly, given you make it relevant to the content of the page, not some SHA-1 hash. Your best bet is using the page title, with-no-punctuation-and-spaces-replaced-with-dashes.

I agree with ayanami, I would add that which style would you use:

http://www.blah.com/totally_dynamic_changing_all_the_time.php

http://www.blah.com/totally_dynamic_changing_all_the_time.html

http://www.blah.com/totally_dynamic_changing_all_the_time/

http://www.blah.com/totally_dynamic_changing_all_the_time

is mostly irrelevant from SEO perspective. they are all better than this_page.php?id=1234 (if the match page content / title)