index.php

<?php

/**
 * A simple, clean and secure PHP Login Script / MINIMAL VERSION
 *
 * Uses PHP SESSIONS, modern password-hashing and salting and gives the basic functions a proper login system needs.
 *
 * @author Panique
 * @link /~https://github.com/panique/php-login-minimal/
 * @license http://opensource.org/licenses/MIT MIT License
 */

// checking for minimum PHP version
if (version_compare(PHP_VERSION, '5.3.7', '<')) {
    exit("Sorry, Simple PHP Login does not run on a PHP version smaller than 5.3.7 !");
} else if (version_compare(PHP_VERSION, '5.5.0', '<')) {
    // if you are using PHP 5.3 or PHP 5.4 you have to include the password_api_compatibility_library.php
    // (this library adds the PHP 5.5 password hashing functions to older versions of PHP)
    require_once("libraries/password_compatibility_library.php");
}

// include the configs / constants for the database connection
require_once("config/db.php");

// load the login class
require_once("classes/Login.php");

// create a login object. when this object is created, it will do all login/logout stuff automatically
// so this single line handles the entire login process. in consequence, you can simply ...
$login = new Login();

// ... ask if we are logged in here:
if ($login->isUserLoggedIn() == true) {
    // the user is logged in. you can do whatever you want here.
    // for demonstration purposes, we simply show the "you are logged in" view.
	if(isset($_GET['ID'])){
	$con  = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
	$ID = mysqli_real_escape_string($con,$_GET['ID']);
	$sql ="SELECT * from users WHERE user_name='$ID'";
	$result = mysqli_query($con, $sql) or die("BAd QUERy $sql");
	$row = mysqli_fetch_array($result);
	include("views/logged_in.php");
	}
	else{
		$userid = $_SESSION['user_name'];
		header('location: /index.php?ID=' . $userid);
	}
	

} else {
    // the user is not logged in. you can do whatever you want here.
    // for demonstration purposes, we simply show the "you are not logged in" view.
    include("views/not_logged_in.php");
}
?>