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redirects to the php login page not accessible

Redirect to login page in php but can not access home.php when login successfully. Please help

index.php

<?php
session_start();
require_once 'class.user.php';
$user_login = new USER();

if($user_login->is_logged_in()!="")
{
    $user_login->redirect('home.php');
}

if(isset($_POST['btn-login']))
{
    $email = trim($_POST['txtemail']);
    $upass = trim($_POST['txtupass']);

    if($user_login->login($email,$upass))
    {
        $user_login->redirect('home.php');
    }
}
?>

<!DOCTYPE html>
<html>

</html>

home.php

<?php
  include("checklogin.php");
  check_login();
?>
<!DOCTYPE html>
<html>
</html>

checklogin.php

<?php
function check_login()
{
if(strlen($_SESSION['login'])==0)
    {   
        $host=$_SERVER['HTTP_HOST'];
        $uri  = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
        $extra="index.php";     
        $_SESSION["login"]="";
        header("Location: http://$host$uri/$extra");
    }
}
?>

before logging on to home.php will redirect to index.php. When successful login, the error rate Too Many Redirects

You need to add session_start(); for your home page code. You are getting too many redirects error since session is not started on home.php

<?php
  session_start();
  include("checklogin.php");
  check_login();
?>
<!DOCTYPE html>
<html>
</html>

Hope it helps

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