<?php

include "admin-lib/AdminGetStatic.php";
$gs = new AdminGetStatic();
if (isset($_REQUEST['method'])) {
    $method = $_REQUEST['method'];
    switch ($method) {
        case "logout":
            $gs->logOut();
            break;
        default:
            $gs->logOut();
            break;
    }
}
<?php

@session_start();
include "admin-lib/AdminGetStatic.php";
include "admin-lib/AdminController.php";
$gs = new AdminGetStatic();
$ac = new AdminController();
$gs->checkLoginStatus();
$url = $gs->adminBaseUrl();
$data = $ac->getAboutUs();
if (isset($_POST['update_about'])) {
    $about_details = $_POST['about'];
    $ac->updateAbout($about_details);
}
?>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <title>Custom Admin Panel | About Us</title>

    <!-- Bootstrap core CSS -->

    <link href="<?php 
echo $url;
?>
<?php

@session_start();
include "admin-lib/AdminGetStatic.php";
include "admin-lib/AdminController.php";
$gs = new AdminGetStatic();
$ac = new AdminController();
$url = $gs->adminBaseUrl();
//Admin Login
if (isset($_POST['submit'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];
    $login_response = $ac->adminLogin($username, $password);
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Administrator Login</title>
    <link href="<?php 
echo $url;
?>
admin-styles/bootstrap.min.css" rel="stylesheet">
    <link href="<?php 
echo $url;
?>
admin-styles/font-awesome.min.css" rel="stylesheet">