Change php.ini for specific domains.

Hello.
I am trying to figure out how to use unique php.ini for specific domains.

For now I have a website which placed here:

/home/domain1/public_html

Also I have a subdomain placed here

/home/domain1/public_html/subdomain/

If I add php.ini to

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/home/domain1/public_html/
The system using it only for this folder but not to all subfolders.
So I fix that adding this string into my .htaccess file

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suPHP_ConfigPath /home/domain1/public_html
But after that my subdomain stop working and I could see a message like this

/home/domain1/public_html/.htaccess: suPHP_ConfigPath not allowed here, referer: http://subdomain.domain1.com/

Could you explain for me how to use one php.ini to my domain1 recursively and let my subdomain work properly?..

I fixed the problem adding subdomain to /public_html_subdomain/ folder
But I am not sure is that correct to put subdomains files into /public_html_subdomain/ instead of standard path which is /puclic_html/subdomain/.
Thank you for any clarification.