php.ini change: no effect on "Local Value"

[Toba <toba@tsepa.net>]

Hello all,

I want to set up Joomla! on a server.
I "leaved" register_globals to "On" in /etc/php5/apache2/php.ini.
But as Joomla! requires register_globals to "Off", I created a php.ini file in 
/var/www/joolma (the root directory).

Content of the file:

tsorpa:/var/www/joomla# cat php.ini
[PHP]
register_globals = off
tsorpa:/var/www/joomla#

But no effect when I check phpinfo(): register_globals is still set to "ON" on 
both Master Value and Local Value.

Does someone know why? Is my php.ini synthax incorrect? Have I to change 
something in main php.ini to permit a Local Value change?

Best regards,

Tôba