PHP - config file location

Method 1:

Create info.php with code below and open the file in your browser
You will see the path to the php.ini like in the following screenshot
php config file location

Method 2

For Linux based OS
        php -i | grep "Loaded Configuration File"
For Windows
        php -i | findstr /c:"Loaded Configuration File"
Output should be something like this
        Loaded Configuration File => /etc/php/7.2/cli/php.ini