ajax - passing a PHP variable to pages loading in a div -

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i trying pass php variable series of pages loading in div within admin page . once click link link page refreshes , directed login page. tried start session in admin.php , put variable in $_session, didn't make sense.i still directed login.php. 

<?php     $_session['user_id']=$_get['msg'];     if(!isset($_session['user_id'])){      # redirect login page      header('location: login.php?msg=' . urlencode('login first.'));      exit();  }      ?>    <li><a href='admin.php?url=addnews.php'><span> news</span></a></li>  <li><a href='admin.php?url=addarticles.php'><span>articles</span></a></li>

you haven't called session_start before setting session variables, , result session data not being saved between page refreshes or redirects.

<?php session_start(); $_session['user_id'] = $_get['msg'];

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