login.php:

<?php
session_start();
?>



<!-- Formstuff for login -->
<form action="/memelord/dologin.php" method="POST">
  Username:<br>
  <input type="text" name="username" /><br>
  Password:<br>
  <input type="password" name="password" /><br><br>
  <input type="submit" value="Login">
</form>


Formstuff for account creation
<b>No account? Make one dumkass:</b>

<form action="/memelord/register.php" method="POST">
  Username:<br>
  <input type="text" name="username_new" value=""><br><br>
  Password:<br>
  <input type="text" name="password_new" value=""><br><br>
   Repeat password:<br>
  <input type="text" name="password_new2" value=""><br><br>
  <input type="submit" value="Submit">
</form>

register.php:

<?php
//start session
session_start();

//connection stuff goes here:
include("./db.php");
DB::connect();

$username = $_POST["username_new"];
$password = $_POST["password_new"];
$hash = password_hash($password, PASSWORD_DEFAULT);

$stmt = DB::$connection->prepare("INSERT INTO accounts set username=?, password=?");
$stmt->execute([$username, $hash]);

header("location: /memelord/login.php");

?>

dologin.php:

<?php
//start session
session_start();

//connection stuff goes here:
include("./db.php");
DB::connect();

if(isset($_SESSION['login_user'])){          // Checking whether the session is already there or not if
  header("Location: /memelord/index.php");  // true then header redirect it to the home page directly
 }



// login function
function login($usr,$pwd){
  $postpwd = $_POST['password'];
  $postusr = $_POST['username'];

  $result = DB::$connection->prepare("SELECT * FROM accounts WHERE username= :hjhjhjh");
  $result->bindParam(':hjhjhjh', $usr);
  $result->execute();
  $users = $result->fetch(0);
  if(isset($users[2])){
    if (password_verify($postpwd, $users[2])) {
        echo "success";// valid login
    } else {
        echo "pwd error";// invalid password
    }
  } else {
    echo "username error";// invalid username
    }

  }


if($_POST['username'] == '' || $_POST['password'] == ''){
    echo "User not found.";
    session_destroy();
    echo "<br/>Session terminated";
    header("location: /memelord/index.php");
 }
else{
  login($_POST['username'], $_POST['password']) ;
}

?>