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In many instances, locating the active php.ini file is very simple. Run the following command to view the instances of php.ini, including “Loaded Configuration File”:

php.ini
# php --ini

Example output:

# php --ini
Configuration File (php.ini) Path: /etc
Loaded Configuration File:         /etc/php.ini
Scan for additional .ini files in: /etc/php.d
Additional .ini files parsed:      /etc/php.d/bcmath.ini,
/etc/php.d/curl.ini,

Alternate Method:

No matter what control panel you are using, the complete way to find what php.ini file to edit for specific domain is by the following:

Create file inside your site, name it for example info.php, with content:

<? phpinfo() ?>

Open the file in your browser window, like http://domain.tld/info.php

Search for line Loaded Configuration File, which will show you full path to php.ini file.