how to find php.ini file in my server

hello,

i am using bigrock wordpress shared hosting and i want to edit php.ini file to disable dangerous php functions…

https://web.securityinnovation.com/appsec-weekly/blog/bid/79067/Disable-Dangerous-Functions-in-PHP

and my php.ini file path
(php.ini) file Path /usr/local/altphp54/lib/php.ini

unable to find usr/local/ directory in my root folder..
HELP me.

1)how to find php.ini file using cpanel..(i know php.ini path but difficult to find usr/local) any other alternatives to edit php.ini file???

please help me..

thank you..