@NogDogFeb 08.2011 — #In UNIX/Linux, a symbolic link is essentially like a shortcut in Windows: it looks/acts like a file or directory, but is actually just a pointer to the actual file/directory it links to. If you're at a command line, [b]ls -al[/b] (lower case "L" in both places) should show all directories, files, and symlinks in a detailed listing, where symlinks in the listing should include the path-name to which they are linked.
@DasherFeb 08.2011 — #Many webhosting companies use a common php.ini file. You can override this by specifying a custom one via cPanel. When you do that a fresh copy of php.ini will be loaded into your root directory. You can then modify this copy to your specific needs.
@DariaFeb 09.2011 — #Another thing to consider, in regards to webhosting companies - some of them "block" your access to the php.ini, specifically when you are in the shared environment. If you do not have access direct access to it you may need to contact your host and have their techs modify the file for what you are trying to do, if it is "allowed" by their shared use policy. If not, some of the things that you are looking to do you may achieve via .htaccess file, instead. Just google php.ini and .htaccess together.