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addUser.php
admin.php
check_login.php
db.php
deleteUser.php
editUser.php
index.php
insertUser.php
login.php
logout.php
updateUser.php

`login.php`

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<?php
session_start();
require_once "db.php";

$username = trim($_POST["username"] ?? "");
$password = trim($_POST["password"] ?? "");

if ($username === "" || $password === "") {
  header("Location: index.php?mess=Tomma fält är inte tillåtna.");
  exit;
}

$sql = "SELECT userId, username FROM user WHERE username=? AND password=? LIMIT 1";
$stmt = $conn->prepare($sql);
$stmt->bind_param("ss", $username, $password);
$stmt->execute();

$res = $stmt->get_result()->fetch_assoc();

if (isset($res["userId"])) {
  $_SESSION["username"] = $res["username"];
  header("Location: admin.php?mess=Inloggning lyckades.");
  exit;
}

header("Location: index.php?mess=Felaktiga inloggningsuppgifter.");
exit;