Thanks a lot till for the indications.
If I understand you (and some other posts in this forum about similar issues), if I like different php.inis for each site I just need to change my "ISPconfig Apache Directives" requesting it.
If I catch it, it means:
Options +Includes +FollowSymlinks -Indexes
Allow from all
php_value post_max_size 500
<Files ~ "^\.ht">
Deny from all
And after this:
1) cp /etc/php5/cgi/php.ini /var/www/web3/etc/php.ini
2) vim /var/www/web3/etc/php.ini (to include my specific changes)
3) /etc/init.d/apache2 restart
But unfortunately, a phpinfo I run on this site still shows default settings.
Did I miss something?
Sorry in advance for the newbie questions. :-(
Thanks again for your help,