Setting directives with php_value or php_admin_flag works only with mod_php. If you want to use suphp, then you can specify the directory for a dedicated php.ini instead:
suPHP_ConfigPath (expects a path name)
This option tells mod_suphp which path to pass on to the PHP-interpreter
(by setting the PHPRC environment variable).
Do *NOT* refer to a file but to the directory the file resists in.
E.g.: If you want to use "/path/to/server/config/php.ini", use
If you don't use this option, PHP will use its compiled in default path.