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session_id

Description

The session_id of Session for PHP gets and/or sets the current session id.

Syntax

session_id(
    ?string $id = null
): string|false

Parameters

id

If id is specified and not null, it will replace the current session id. session_id() needs to be called before session_start() for that purpose. Depending on the session handler, not all characters are allowed within the session id. For example, the file session handler only allows characters in the range a-z A-Z 0-9 , (comma) and - (minus).

NOTE: When using session cookies, specifying an id for session_id() will always send a new cookie when session_start() is called, regardless if the current session id is identical to the one being set.

Return

Returns the session id for the current session or the empty string ("") if there is no current session (no current session id exists). On failure, false is returned.

Examples

1 · void

<?

$return = session_id();

var_export($return);

?>
''

2 · id · previous

<?

$id = "myid";

$return = session_id($id);

var_export($return);

?>
''

3 · id · current

<?

$id = "myid";

session_id($id);

$return = session_id();

echo $return;

?>
myid
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