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PHP - session_regenerate_id() Function
Definition and Usage
Sessions or session handling is a way to make the data available across various pages of a web application. The session_regenerate_id() function generates a new session id and updates the current one with the newly created one.
Syntax
session_regenerate_id([$delete_old_session]);
Parameters
Sr.No | Parameter & Description |
---|---|
1 |
delete_old_session (Optional) This is a boolean value which is used to specify whether to delete the old associated session file or not. If You pass TRUE as a value it does else not. |
Return Values
This returns a boolean value which is TRUE in case of success else FALSE.
PHP Version
This function was first introduced in PHP Version 4 and works in all the later versions.
Example 1
Following example demonstrates the usage of the session_regenerate_id() function.
<html> <head> <title>Setting up a PHP session</title> </head> <body> <?php //Creating a custom session id session_id("my-id"); //Starting the session session_start(); print("Id: ".session_id()); session_regenerate_id(); echo "<br>"; print("New Session Id: ".session_id()); ?> </body> </html>
One executing the above html file it will display the following message −
Id: my-id New Session Id: sm6tplqv1e2dhchnv75d7i3bic
Example 2
Following is another example of this function.
session_page1.htm
<html> <body> <?php //Starting the session $id = session_create_id(); session_id($id); print("\n"."Id: ".$id); session_start(); session_regenerate_id(); echo "<br>"; print("New Session Id: ".session_id()); ?> </body> </html>
This will produce the following output −
Id: r30p6i4cnu0qs683lsu8bchv5u New Session Id: jj24l3eumtps2nudqa0gm843qr
Example 3
You can remove the older session file as show below −
<html> <head> <title>Setting up a PHP session</title> </head> <body> <?php //Creating a custom session id session_id("my-id"); //Starting the session session_start(); print("Id: ".session_id()); session_regenerate_id(TRUE); echo "<br>"; print("New Session Id: ".session_id()); ?> </body> </html>
One executing the above html file it will display the following message −
Id: my-id New Session Id: k5dli3nl4lf6vogu156r4qb0l1