.htaccess congif


I have apache installed with PHP (thankyou mattvon)
I am having trouble with two things in .htaccess:

1. mod_rewrite
Has anybody had strange results with mod_rewrite? Simple things that I had set on other webservers, just don't seem to work on my mac.

2. php_value open_basedir
I have this set :
php_value open_basedir "/Library/WebServer/Documents:/Library/WebServer/Includes"
And yet it doesn't seem to do anything. What gives?