create php.ini file and resolve several other issues

I currently have a oscommerce site and have had security issues with my website and need: 1. to add a [login to view URL] file in the main site to restrict the following: disable_functions = show_source, system, passthru, phpinfo, proc_open, allow_url_fopen, exec, shell_exec There has been issues with darkmailers and such. 2. Resolve problem that customers cannot log in after they create an account. This is the third time I've had this problem looked at, but it has not been fixed. I don't believe this is a major project, but need someone to look at it ASAP. Thank you.