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)
Since PHP 5.4.0. Return value of session_status() if sessions are disabled.
PHP_SESSION_NONE (int)
Since PHP 5.4.0. Return value of session_status() if sessions are enabled, but no session exists.
PHP_SESSION_ACTIVE (int)
Since PHP 5.4.0. 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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12
sarath dot jasrin at gmail dot com
3 years ago
Check whether session started using Predefined Constants

if (session_status() == PHP_SESSION_NONE) {
    session_start();
}
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9
Anonymous
3 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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