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I'm not quite sure what the purpose of session_names is.. Can someone please explain in what circumstances defining a name would be beneficial?
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The session name references the name of the session, which is used in cookies and URLs (e.g. PHPSESSID). It should contain only alphanumeric characters; it should be short and descriptive (i.e. for users with enabled cookie warnings). If name is specified, the name of the current session is changed to its value.
session_destroy() destroys all of the data associated with the current session. It does not unset any of the global variables associated with the session, or unset the session cookie. To use the session variables again, session_start() has to be called.
session_start() creates a session or resumes the current one based on a session identifier passed via a GET or POST request, or passed via a cookie. When session_start() is called or when a session auto starts, PHP will call the open and read session save handlers.
session_name() must be called before session_start() for the session to work properly. The session name is reset to the default value stored in session.name at request startup time. Thus, you need to call session_name() for every request (and before session_start() is called).
You have two sites on the same domain. (say, a blog and a forum)
They both run different pieces of software.
If they ran on the same session and used the same variables in $_SESSION, (say, user_id), they would conflict.
session_name lets you give each application a different session.
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The default is - I think - PHPSESSID. If you have more than one application on the same host, they would share those sessions. So, you should set different session names for each application, so that there is no weird stuff happening.
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