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session_regenerate_id

Description

The session_regenerate_id of Session for PHP updates the current session id with a newly generated one.

Syntax

session_regenerate_id(
    bool $delete_old_session = false
): bool

Parameters

delete_old_session

Whether to delete the old associated session file or not. You should not delete old session if you need to avoid races caused by deletion or detect/avoid session hijack attacks.

Return

Returns true on success or false on failure.

Examples

1 · void

<?

session_start();

$session_id1 = session_id();

echo "session_id1: $session_id1\n";

$return = session_regenerate_id();

var_export($return);

$session_id2 = session_id();

echo "\nsession_id2: $session_id2";

session_id1: d145e691657aff885e739d85d560c2bf
true
session_id2: c99b2afaca6cf225975c76f241feb63e

2 · delete_old_session · false

<?

session_start();

$session_id1 = session_id();

echo "session_id1: $session_id1\n";

$delete_old_session = false;

$return = session_regenerate_id($delete_old_session);

var_export($return);

$session_gc = session_gc();

echo "\nsession_gc: $session_gc";

$session_id2 = session_id();

echo "\nsession_id2: $session_id2";

session_id1: bd2c54fe79fb1ca799edd08db2cbc7d1
true
session_gc: 22
session_id2: 6ff2c422cb8966d71bb108d4f76938e7

3 · delete_old_session · true

<?

session_start();

$session_id1 = session_id();

echo "session_id1: $session_id1\n";

$delete_old_session = true;

$return = session_regenerate_id($delete_old_session);

var_export($return);

$session_gc = session_gc();

echo "\nsession_gc: $session_gc";

$session_id2 = session_id();

echo "\nsession_id2: $session_id2";

session_id1: 9366a0933570bac8fea5b267eb6ba4d1
true
session_gc: 0
session_id2: b32e9c888c60927c88fef88ad5b185c7