I am using NGINX with PHP 5.4.23 on CentOS
I am facing very wired issue on it.
when i see phpinfo(), it says
Loaded Configuration File: /etc/php.ini
but when i do changes in this file, it don't shows in phpinfo().
I also restarted nginx and check it. but not changes reflected.
you have to restart php-fpm service :
service php-fpm restart
service php5-fpm restart //if you avec php5
or
/etc/init.d/php-fpm restart
/etc/init.d/php5-fpm restart //if you avec php5
EDIT :
you have php-fastcgi, so replace ftpm by fastcgi :
/etc/init.d/php-fastcgi restart