If using this code
<IfModule mod_php5.c> #Turn off php register globals php_flag register_globals off </IfModule>
gives the error :
.htaccess: php_flag not allowed here
in /var/log/apache/error.log
Then Options should be added to AllowOverride in : /etc/apache2/sites-available/default
AllowOverride FileInfo Options
like this
<Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride FileInfo Options Order allow,deny allow from all </Directory>