skapade registrering, logga in och logga ut. ändrade lite i auth.php

inc/php/login.php

@@ -0,0 +1,43 @@
+<?php
+session_start();
+require_once($_SERVER['DOCUMENT_ROOT'] . '/db.php');
+
+$errors = [];
+
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    $user = trim($_POST['user'] ?? '');
+    $password = $_POST['password'] ?? '';
+
+    if (empty($user) || empty($password)) {
+        $errors[] = "All fields are required.";
+    }
+
+    if (empty($errors)) {
+        $conn = getConnection();
+        $stmt = $conn->prepare("SELECT id, password, uniqueid FROM users WHERE email = :user OR username = :user");
+        $stmt->execute(['user' => $user]);
+        $result = $stmt->fetch();
+
+        if ($result && password_verify($password, $result['password'])) {
+            $_SESSION['user_id'] = $result['id'];
+            $_SESSION['uniqueid'] = $result['uniqueid'];
+            header("Location: /home.php");
+            exit();
+        } else {
+            $errors[] = "Invalid credentials.";
+        }
+    }
+}
+?>
+
+<!-- Basic form UI -->
+<h2>Login</h2>
+<form method="POST">
+    <input name="user" placeholder="Username or Email" required><br>
+    <input name="password" type="password" placeholder="Password" required><br>
+    <button type="submit">Login</button>
+</form>
+
+<?php if (!empty($errors)): ?>
+    <ul><?php foreach ($errors as $e) echo "<li>$e</li>"; ?></ul>
+<?php endif; ?>