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# session_id

(PHP 4 >= 4.0.0)

session_id -- Get and/or set the current session id

## Description

``string session_id` ([string id])`

session_id() returns the session id for the current session. If `id` is specified, it will replace the current session id.

The constant SID can also be used to retrieve the current name and session id as a string suitable for adding to URLs.

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