How do I get this thing to work

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PHP

I have set a session on the login script and on the next page i want to check if the session is set however it does not login. when a i try to access page 2 without logging in it takes me to page 1 which works fine however when i do log in it still takes me to login page. please help.
my login script looks like this. I am still working on the crsf method

<?php 
ini_set('display_errors', '0');
session_save_path('/tmp');
session_start();
$_SESSION['logged_in'];
//login page is like this

require_once 'connection.php';


if($_SERVER['REQUEST_METHOD'] == 'POST'){ 
$username = trim($_POST['username']);

try{

  $Query = "SELECT * FROM users WHERE username = :username";
  $statement = $conn->prepare($Query);
  $statement->bindValue(':username', $username);
  $statement->execute();
  $user = $statement->fetch(PDO::FETCH_ASSOC);    
  $RowCount = $statement->rowCount();

} catch (PDOerrorInfo $e){

    die('QuerySCD Error '.$e->getMessage());

  }

  if( $RowCount == 0 ){
   // User doesn't exist
    $_SESSION['message'] = "error!";
    //header("location: error-login.php");
    $message = "Invalid login credentials";

  } else{ // User exists

      if( password_verify($_POST['password'], $user['password'])){

        $_SESSION['username']  = $user['username'];
        $_SESSION['active']    = $user['active'];
        $_SESSION['logged_in'] = $user['logged_in'];

        $_SESSION['logged_in'] = true;

        header("location: studentportal.php?onions=no&pickles=yes");

      } else {

          $_SESSION['message'] = "error!";
          //header("location: error-login.php");
          $message = "Invalid login credentials";

        }      
    }  
}

$conn = NULL;
?>
my second page look like this 
 
<?php
ini_set('display_errors', '0');
session_save_path('/tmp');

if ($_SESSION['logged_in']) {
	$_SESSION['logged_in'] = true;
	header('Location: studentportal.php');
	$message = 'welcome user';
} else {
	header('Location: index.php');
}

?>

What I have tried:

i have tried research and tutorials