Costanti predefinite

    Queste costanti sono definite da questa estensione e sono disponibili solo se l'estensione è stata compilata nel PHP o se è stata caricata dinamicamente a runtime.

    SID (string)
    Constant containing either the session name and session ID in the form of "name=ID" or empty string if session ID was set in an appropriate session cookie. This is the same id as the one returned by session_id().
    PHP_SESSION_DISABLED (int)
    Return value of session_status() if sessions are disabled.
    PHP_SESSION_NONE (int)
    Return value of session_status() if sessions are enabled, but no session exists.
    PHP_SESSION_ACTIVE (int)
    Return value of session_status() if sessions are enabled, and a session exists.

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    User Contributed Notes 2 notes

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    13
    sarath dot jasrin at gmail dot com
    9 years ago
    Check whether session started using Predefined Constants

    if (session_status() == PHP_SESSION_NONE) {
    session_start();
    }
    up
    8
    Anonymous
    9 years ago
    SID constant defined dynamically!

    var_dump(defined('SID')); // bool(false) - Not defined...
    session_start();
    var_dump(defined('SID')); // bool(true) - Defined now!
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