404 Not Found

<?php
// @ob_start()
//  @session_start();
//   echo $_SESSION['login_user'];

//  if ($_SESSION['login_user'] != 'test') {
//     // echo 'hai';
//    echo "<script>window.location.href='login.php';</script>";
//    exit;
//  }
session_start();

if (!isset($_SESSION['login_user'])) {
    header("Location: login.php");
    exit();
}
?>

<!DOCTYPE html>
<html lang="en">

<head>

<title>Admin </title>

<link href="vendor/fontawesome-free/css/all.min.css" rel="stylesheet" type="text/css">
    <link
        href="https://fonts.googleapis.com/css?family=Nunito:200,200i,300,300i,400,400i,600,600i,700,700i,800,800i,900,900i"
        rel="stylesheet">

<link href="css/sb-admin-2.min.css" rel="stylesheet">
    
    
    <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
    <link href="https://cdn.jsdelivr.net/npm/summernote@0.8.18/dist/summernote.min.css" rel="stylesheet">
    <script src="js/summernote.min.js"></script>
    <style type="text/css">
        .note-editor {
    position: relative;
    width: 100% !important;
}
    </style>
</head>

<div id="wrapper">

<ul class="navbar-nav bg-clr sidebar sidebar-dark accordion" id="accordionSidebar">

<hr class="sidebar-divider my-0">

<li class="nav-item">
                <a class="nav-link <?php echo $pmenu_active; ?>" href="products.php">

<span>Products</span></a>
            </li>

<hr class="sidebar-divider">
            
            <li class="nav-item">
                <a class="nav-link <?php echo $cmenu_active; ?>" href="category-list.php">

<span>Product Categories</span></a>
            </li>
   
   <hr class="sidebar-divider">
            
            <li class="nav-item">
                <a class="nav-link <?php echo $brmenu_active; ?>" href="brands.php">

<span>Brands</span></a>
            </li>

<hr class="sidebar-divider">

<li class="nav-item">
                <a class="nav-link <?php echo $nmenu_active; ?>" href="news_events.php">

<span>News & Events</span></a>
            </li>
            <hr class="sidebar-divider">
            
            <li class="nav-item">
                <a class="nav-link <?php echo $bmenu_active; ?>" href="blog.php">

<span>Blogs</span></a>
            </li>

<hr class="sidebar-divider">
            
            <li class="nav-item">
                <a class="nav-link <?php echo $crmenu_active; ?>" href="job-list.php">

<span>Careers</span></a>
            </li>

<span>Index SEO</span></a>
            </li>
            
            <hr class="sidebar-divider d-none d-md-block">
            <li class="nav-item">
                <a class="nav-link <?php echo $lmenu_active; ?>" href="leads.php">

<span>Leads</span></a>
            </li>

</ul>

<div id="content-wrapper" class="d-flex flex-column">

<div id="content">

<script type="text/javascript">
      var session = sessionStorage.getItem("user_id");
      console.log(session,"session");
      if (session == '' || session == null || session == undefined) {

window.onload = () => {

window.location.href='login.php';

}
      }
      document.addEventListener('DOMContentLoaded', function() {
  // Get all the sidebar nav links
  var sidebarLinks = document.querySelectorAll('.sidebar .nav-item .nav-link');

// Add a click event listener to each link
  sidebarLinks.forEach(function(link) {
    link.addEventListener('click', function() {
      // Remove the 'active' class from all links
      sidebarLinks.forEach(function(link) {
        link.classList.remove('active');
      });

// Add the 'active' class to the clicked link
      this.classList.add('active');
    });
  });
});
   </script>