Or fel, they could get off their ass and look it up. Who's to say the website will still exist. Personally php.net has about 99% of the stuff you need to know definition wise and google has the rest.
It's not about stroking your ego; when you speak with other people about PHP it gives you a base vocabulary that is standard, the same definition, making it much easier to communicate. Better be...
Brevity is a free open source code base or framework for people who do not wish to have cookie cutter websites. Brevitys' minimal structure cuts down massively on overhead because of its simplicity....
Well it boils down to a few things. You need to make sure that your directory permissions are set correctly (man chmod). You also need to make sure that your scripts are secure. You can run a fuzzer...
Well you could have your login page post to a php page such as login.php which handles all the login functions. Then at the top of the member page test to see if they are logged in before displaying.
PHP is a scripting language, you need to have some way to send commands to the camera for instance a plugin that allows you to control the camera, or at least that particular functionality.