I have a folder, and for all php files in that folder (or even better, in that folder or any folders within it) I\'d like to make some changes to the php settings. Can I jus
You'll have to use a .htaccess file for that. There a section in the PHP manual about that:
http://php.net/manual/en/configuration.changes.php
For more general information on htaccess files you can read:
http://en.wikipedia.org/wiki/Htaccess
or
http://httpd.apache.org/docs/2.0/howto/htaccess.html