If you have a dedicated server and use it to sell shared hosting and you want to force users To use single php.ini Under suPHP then this article is for you. Today I am going to explain how you can force your users to use same php.ini under suPHP by disallowing .htaccess override. Limiting php.ini use will add security to your server and will disallow users to use custom php.ini file by overriding default php settings set by server administrator (root).
How to make it work:
Its very simple to enable this function in server using suPHP. Just by enabling phprc_paths in /opt/suphp/etc/suphp.conf will do the work for you. See the steps below:
Find the code below and press I to insert text.
;Uncommenting these will force all requests to that handler to use the php.ini
;in the specified directory regardless of suPHP_ConfigPath settings.
Remove ( ; ) from the last three lines ie.
Now press ESCAPE button and enter :wq to save the file.
/sbin/service httpd restart
Now Users wont be able to override your default php.ini file.
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Article Source: Force specific php.ini in suPHP