session_status

(PHP >=5.4.0)

session_statusReturns the current session status

Description

int session_status ( void )

session_status() is used to return the current session status.

Return Values

  • PHP_SESSION_DISABLED if sessions are disabled.
  • PHP_SESSION_NONE if sessions are enabled, but none exists.
  • PHP_SESSION_ACTIVE if sessions are enabled, and one exists.

See Also

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User Contributed Notes 4 notes

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14
coder dot ua at gmail dot com
1 year ago
Universal function for checking session status.

<?php
/**
* @return bool
*/
function is_session_started()
{
    if (
php_sapi_name() !== 'cli' ) {
        if (
version_compare(phpversion(), '5.4.0', '>=') ) {
            return
session_status() === PHP_SESSION_ACTIVE ? TRUE : FALSE;
        } else {
            return
session_id() === '' ? FALSE : TRUE;
        }
    }
    return
FALSE;
}

// Example
if ( is_session_started() === FALSE ) session_start();
?>
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8
php at pointpro dot nl
1 year ago
The advice of ive_insomnia at live dot com should be taken with great care.

First of all, while his use case for session_status is valid, a simpler way to avoid the warning is:

<?php
if (!isset($_SESSION)) { session_start(); }
?>

The example of session_status uses the raw values of constants (2 in this case) created specifically for the purpose of not having to use magic numbers.

Better code would be:

<?php
if (session_status() !== PHP_SESSION_ACTIVE) {session_start();}
?>

The same can be done using

<?
if (session_id() === "") { session_start(); }
?>

The use of this function is lies more towards status management: change the behavior of a script when sessions are disabled altogether, for example.
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2
Ollea
8 months ago
If you started and closed a session then test ( session_id() === '' ) to check if a session is active it won't work, session_id() returns an ID even if the session is closed.

Anybody knows another way before PHP 5.4 to check if a session is really not currently active ?
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1
php at kenman dot net
1 year ago
The purpose of this functionality can aid you specifically in cases where code -- prior to your current code -- might have opened a session and then closed it.

Specifically, depending on $_SESSION, session_id(), and the SID constant to determine if a session is active will FAIL if a session has previously been opened & closed within the same request cycle.

Please see the original bug report here:

https://bugs.php.net/bug.php?id=52982
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