To find location of PHP.ini, run

on linux

Code:
[root@server70 ~]# php -i | grep php.ini
Configuration File (php.ini) Path => /etc
Loaded Configuration File => /etc/php.ini
[root@server70 ~]#
on windows

Code:
C:\Windows\System32>php -i | findstr "php.ini"
Configuration File (php.ini) Path => C:\Windows
Loaded Configuration File => C:\Program Files\php\php.ini
C:\Windows\System32>
You can also create a php file with following content to see php.ini settings

Code:
<?php

phpinfo();
Save it as phpinfo.php

Example phpinfo.php

http://video.bizhat.com/phpinfo.php