Legg til login POST side

login.php

@@ -0,0 +1,24 @@
+<?php
+    require 'includes/common.php';
+
+    if (isset($_SESSION['id'])) {
+        header('Location: ./user.php');
+        exit;
+    }
+
+    if (!isset($_POST['username'], $_POST['password'])) {
+        header('Location: ./');
+        exit;
+    }
+    
+    $username = $_POST['username'];
+    $password = $_POST['password'];
+
+    $con = connect();
+    $getUser = mysqli_query($con, "SELECT * FROM users WHERE username='$username' AND password='$password';");
+    $user = mysqli_fetch_assoc($getUser);
+
+    $_SESSION['id'] = $user['id'];
+    header('Location: ./user.php');
+    exit;
+?>