How do I know which mode works php on my hosting server?
Browse phpinfo on your domain, using the instructions in Knowledge Base "How to see whether PHP for my domain and its parameters".
On the page with phpinfo find variable «Server API». If the value of the variable «Apache 2.0 Handler», then the php for your domain works as a module (mod_php), if the value of the variable «CGI/FastCGI», then the php running as CGI or via su_php.