Web Reference: When a user visits a page that calls the session_start() function, PHP checks for an existing session ID in the user's browser. If no session ID is found, PHP generates a unique, random ID. This ID (stored in a cookie named PHPSESSID) is the only piece of information stored on the client side. Dec 17, 2025 · When a user visits a website, PHP creates a unique session ID for that user. This session ID is then stored as a cookie in the user's browser (by default) or passed via the URL. The session ID helps the server associate the data stored in the session with the user during their visit. Session support in PHP consists of a way to preserve certain data across subsequent accesses. This enables you to build more customized applications and increase the appeal of your web site.
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