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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: 71e6091f67ae202abfa0ce584da07264
true
session_id2: 5c1066cc6affda42ff19e3d3ab84f87a

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: 99e504c01a8a5c98408b62bc9bbb8765
true
session_gc: 12
session_id2: fe4ead248a390e703d6f540f0b8c0d25

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: 5600f66073ae53911eccb65491af1b4f
true
session_gc: 0
session_id2: 47dbb7c69d608d8755eb6a860a6c18a5