[PHP] Assist with session persistance

[Terry Romine]

I have a site that is using $_SESSION['variablename'] for many 
variables that are loaded when the user first enters the site 
(index.php), and then referenced on each page (display.php):

ex:     index.php
        session_start();
        $agencyID=9;
        $agencyName="fremont";
        $_SESSION['agencyID'] = $agencyID;
        $_SESSION['agencyName'] = $agencyName;
ex:     display.php
        session_start();
        $agencyID=$_SESSION['agencyID'];
        $agencyName=$_SESSION['agencyName'];
But after awhile, the session seems to fail and I end up back at the 
index page because the $agencyID gets voided. Is there a timeout on 
sessions other than closing the browser? If so, is there a way to set 
timeout if one doesn't have server admin access? Should I be doing 
something like:

ex:     display.php
        session_start();
        $agencyID=$_SESSION['agencyID'];
        $agencyName=$_SESSION['agencyName'];
        $_SESSION['agencyID'] = $agencyID;
        $_SESSION['agencyName'] = $agencyName;
to update the session variables with each page?

Terry

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