session - I keep log out every time I include php -

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i'm using http://www.php-login.net/ minimal user management system. when use $_get include php page, logged out. doesn't happen when log in on development machine. when tried on different computer, logged out. how can find out what's causing this?

im guessing session?

some part of index.php

require_once("db/configure.php");  require_once("classes/login.php");  include_once("analyticstracking.php");         if ($login->isuserloggedin() == true) {          include("inc/user.php");      } else {          include("inc/nonuser.php");     }

my user.php

<?                $pagearray = [      'home' => 'views/home.php',      'setting' => 'views/setting.php',      'article' => 'views/article.php'  ];   if(isset($_get['page'])){      $page = $_get['page'];  }else{      $page = null;  }  if($page && isset($pagearray[$page]) && $_session['user_id'] > 0){      include $pagearray[$page];  }else{      include "views/home.php";  }  ?>


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