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Code for header.php
<!DOCTYPE html>
<html lang="en">
<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <link href='http://fonts.googleapis.com/css?family=Open+Sans+Condensed:300' rel='stylesheet' type='text/css'>
    <link href='http://fonts.googleapis.com/css?family=Open+Sans:400italic,400,600italic,600' rel='stylesheet' type='text/css'>
    <?php
        if (!isset($_SESSION)) session_start();
        if (!isset($_SESSION['admin_eap_secure'])) 
        {
            header('Location: ./index.php');
        }
        include "../config/config.php";
        include "../includes/functions.php";
    ?>
 
    