<?php
session_start();

$passwords = array("Fabien" => "Fabien",
"Kawika" => "Kawika",
"guest" => "password",
"Lexi" => "Lexi");

if($_SERVER['REQUEST_METHOD'] == 'POST') {
  if(!empty($_POST['username']) && !empty($_POST['password'])) {
    if ($_POST["password"] == $passwords[$_POST["user"]]) {
      $_POST['user'] = $_SESSION['user'];
      header("Location: results.php");
    }
    } else {
    echo "Error. Please try again.";
  }
}

?>