How to use php session_id function

php session_id function is used to get/set the current session ID. Its syntax is string session_id ([ string $id ]). The parameter id means that if the value of the id parameter is specified, the specified value will be used as the session ID.

#php session_id function how to use?

Function: Get/set the current session ID

Syntax:

string session_id ([ string $id ] )

Parameters:

id If the value of the id parameter is specified, use the specified value as the session ID. The session_id() function must be called before the session_start() function is called.

Description:

session_id() returns the current session ID. If there is no current session, an empty string ("") is returned.

php session_id() function usage example 1

<?php
session_id(1);
session_start();
var_dump(session_id());
?>

Output:

string(1) "1"

php session_id() function usage example 2

<?php
session_start();
session_id(2);
echo session_id();
?>

Output:

2

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