PHP Configuration for Addon Domain
To use specific PHP settings only for a particular addon domain you will need to place a php.ini file in the addon domain's folder.
Configure PHP for an Addon Domain
If you need to generate a new php.ini file, this can be done in the cPanel by clicking on the icon "PHP Config", choose your version of PHP and then click Save. This will copy the server's master php.ini to your public_html directory as "php.ini.default". This file must then be moved to the addon's folder and renamed to php.ini.
If you are using the 'single php.ini' option in the cPanel's PHP Config section, you will need to create a .htaccess file in the addon's folder. In the addon's .htaccess file it needs to contain a regular PHP handler:
AddHandler application/x-httpd-php7 .php
To verify your addon domain is using the php.ini file you have set up, you can create a new file in the addon's folder called info.php containing the following PHP code:
<?php phpinfo(); ?>
Viewing the info.php file in a web browser should show you all the PHP settings from the addon's php.ini including the "Loaded Configuration File". This is the path to the php.ini file being used.