session_id — Get/Set the Current Session ID (PHP)
The article explains PHP's session_id() function, showing how to retrieve or set the current session ID, the optional id parameter requirements, character restrictions for different session handlers, and the function’s return behavior, including using the SID constant for URL integration.
session_id — Get/Set the Current Session ID
string session_id([ string $id ])session_id() can be used to retrieve or set the current session ID in PHP.
To easily append the session ID to URLs, you can use the constant SID, which returns the session name and ID as a string.
Parameter
id : If the id argument is provided, its value is used as the session ID. It must be called before session_start() . Different session handlers impose different character restrictions; for example, the file handler allows only a‑z, A‑Z, 0‑9, commas and hyphens.
Return value
session_id() returns the current session ID, or an empty string ("") if no session exists.
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