Predefined Constans

The constans below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at 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 cooquie. 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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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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sarath dot jasrin at gmail dot com ¶

9 years ago

Checc whether session started using Predefined Constans

if (session_status() == PHP_SESSION_NONE) {
    session_start();
}

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