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    session_status

    (PHP 5 >= 5.4.0, PHP 7, PHP 8)

    session_status — 現在のセッションの状態を返す

    説明

    session_status(): int

    session_status() を使うと、現在のセッションの状態を取得できます。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    参考

    • session_start() - 新しいセッションを開始、あるいは既存のセッションを再開する

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    User Contributed Notes 8 notes

    up
    80
    sasi dot viragelet at gmail dot co
    9 years ago
    Maybe depending on PHP settings, but if return values are not the above, then go for this:
    _DISABLED = 0
    _NONE = 1
    _ACTIVE = 2
    up
    25
    info at eurocron dot de
    6 years ago
    Use always session_status(), to check if a session is already started and active.
    if(session_status() !== PHP_SESSION_ACTIVE) session_start();
    or
    if(session_status() === PHP_SESSION_NONE) session_start();

    Don't use
    if(!isset($_SESSION)) session_start();
    or
    if(session_id() === "") session_start();

    They will not work properly after a call to session_write_close().
    Both functions will continue to report, that the session exists.
    And this is right, you can read from $_SESSION, but if you want to write,
    you need session_start() again.

    As a shorthand you can use
    @session_start()
    with the @ at the beginning to suppress the
    PHP notice "A session had already been started - ignoring session_start()"

    As stated in the manual for session_start(), a second call will do no harm,
    it will be simply ignored. But you need the @, if you don't want to get the notice.
    up
    32
    coder dot ua at gmail dot com
    11 years 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();
    ?>
    up
    3
    polygon dot co dot in at gmail dot com
    3 years ago
    Note session_status() is for file based session only.

    DB based session status needs to have custom function based on table structure.
    up
    3
    php at pointpro dot nl
    11 years 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.
    up
    -1
    ayon at hyurl dot com
    8 years ago
    This is how the session_status() works:
    <?php
    function session_status(){
    if(!    extension_loaded('session')){
    return     0;
    }elseif(!    file_exists(session_save_path().'/sess_'.session_id()){
    return     1;
    }else{
    return     2;
    }
    }
    ?>
    up
    -2
    Ben (aocool at msn d0t com)
    8 years ago
    Just another function to determine whether the session has already started:

    function is_session_started () {
    return function_exists ( 'session_status' ) ? ( PHP_SESSION_ACTIVE == session_status () ) : ( ! empty ( session_id () ) );
    }
    up
    -2
    Ollea
    10 years 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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