PHP alternative to session_is_registered

does anyone knows the alternative to the deprecated function session_is_registered i开发者_JAVA百科n PHP5?

here's my code:

ob_start();

session_start();

if(!session_is_registered(myusername))

{

    header("location:main_login.php");

}

ob_flush();

Thanks,

Mauro

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"You need to set and reference $_SESSION variables only." For example:

if( isset($_SESSION[$myusername]) )

From http://www.phpfreaks.com/forums/index.php?topic=263189.0

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on a side note, best use $_SESSION['username'] = $myusername;. Using the $_SESSION[$myusername] as a variable may overwrite existing variables in the session.

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But if you set anything in the session variable it will display you the protected page: e.g.,

<?php
    session_start();
    if(isset($_SESSION[$myusername])){
        echo "welcome to protected page.";
    }
    else {  
        header('location:login.php');
        die;     
    }
 ?>

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Use session_id()

if (!session_id()) {
 // do stuff
}

if there is no session id nothing will be returned. (docs - session_id() )