linux - In Ubuntu I make changes to php.ini but nothing happens

Hi, Apache with php works well, but none of the changes I make in php.ini have effect, I've even delete all the contents of the file, then restart Apache, and run phpinfo() and surprisingly everything continues working well.

The file I'm editing is the one that appears in the phpinfo() like "Loaded Configuration File". (/etc/php5/apache2/php.ini)

P.S. I'm running Ubuntu 9.04 and PHP 5.2

More Details:

I'm restarting with sudo /etc/init.d/apache2 restart, I've also tried sudo /etc/init.d/apache2 stop, and then start, at restarting I get:

• Restarting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
  ... waiting apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
  [ OK ]

"which php" did not produce any results.

My installation of PHP was done using Synaptic Package Manager, choosing "Mark Packages by task" and then LAMP server.

I don't have any clue of what to do...