Dodanie ekranu logowania, do zrobienia połączyć to z poprzednim projektem z lekcji 2

Lekcja_03/projekt_logowanie/validate.php

@@ -0,0 +1,38 @@
+<?php
+    if((!isset($_POST['username'])) || (!isset($_POST['password']))) {
+        header("Location: ./");
+        exit();
+    }
+
+    include('config.php');
+    $conn = mysqli_connect($host, $user, $pass, $dbnm);
+
+    session_start();
+
+    $stmt = $conn->prepare("SELECT * FROM uzytkownicy WHERE username = ?;");
+    $stmt->bind_param("s", $_POST["username"]);
+    $stmt->execute();
+
+    $result = $stmt->get_result();
+
+    if($result->num_rows < 1) {
+        header("Location: ./login.php?error=true");
+        exit();
+    }
+
+    $cred = $result->fetch_assoc();
+
+    if(password_verify($_POST['password'], $cred['password_hash'])) {
+        $_SESSION['username'] = $cred['username'];
+        $_SESSION['user_id'] = $cred['id'];
+        $_SESSION['user_rights_level'] = $cred['rights_level'];
+        $_SESSION['logged'] = true;
+
+        header("Location: ./");
+        exit();
+    } else {
+        header("Location: ./login.php?error=true");
+        exit();
+    }
+    
+?>