xd

<?php
session_start();

    if(isset($_GET['logout'])){
        unset($_SESSION['logged']);
        redirect();




    }else if(isset($_SESSION['logged'])){
        echo "<a href='?logout'>Logout</a>";





    }else if(isset($_POST['username']) && isset($_POST['password'])){
        //connect database
        db::connect() and die("Can't connect database!");

        db::query("SELECT * FROM db.users");

        $connected = false;

        if(db::$hasResults){
            while($row = db::$result->fetch_assoc()){
                if($row['username'] == $_POST['username'] && $row['password'] == $_POST['password']){
                    $connected = true;
                    break;
                }
            }
        }

        if($connected){
            //if logged create the session and redirect
            $_SESSION['logged'] = true;
        }

        //close the connection
        db::close();

        //redirect to lose the post refresh
        redirect();






    }else{
    //show login
        echo "
            <form action='' method='POST'>
                <input type='text' name='username' placeholder='Username...'><br>
                <input type='password' name='password' placeholder='Password...'><br>
                <input type='submit' value='Submit'>
            </form>
        ";
    }



    //redirect to self if url its empty
    function redirect($url="top.location.href"){
        echo "<script> top.location.href = ".$url.".split('?')[0]; </script>";
        exit;
    }


















    class db{
        static $o;

        static $hostname = "localhost";
        static $username = "root";
        static $password = "";
        static $error = false;
        static $hasResults = false;

        static $result;

        static function connect($hostname="localhost",$username="root",$password=""){
            self::$hostname = $hostname;
            self::$username = $username;
            self::$password = $password;
            self::$o = new mysqli($hostname, $username, $password);
            self::$error = self::$o->connect_error;
            return self::$error;
        }
        static function close(){
            self::$o->close();
        }

        static function query($sql){
            self::$result = self::$o->query($sql);
            if(self::$result->num_rows > 0){
                self::$hasResults = true;
            }else{
                self::$hasResults = true;
            }

            return self::$hasResults;
        }

        static function error(){
            return self::$error;
        }

    }

?>