To improve login code in PHP by Sessions?

You shouldn't try to manage the session ids yourself. A simple scheme like the one you propose (incrementing the session id by one for every new session) contains a serious security issue: A user with freshly generated session id can trivially guess other valid session ids by trying ids slightly smaller than its own. Thus it is very easy two acquire someone else's session.

You force all new sessions to have the same ID, which means everyone will be sharing the same session! Probably not what you intended?

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