diff --git a/createUser.php b/createUser.php
new file mode 100644
index 0000000..42dfa21
--- /dev/null
+++ b/createUser.php
@@ -0,0 +1,43 @@
+<?php
+
+    require("header.php");
+
+    if ($_POST["username"] AND $_POST["word"] AND $_POST["nb"]) {
+        $username = htmlspecialchars($_POST["username"]);
+        $word = htmlspecialchars($_POST["word"]);
+        $nb = (int) $_POST["nb"];
+
+        $bdd = getPDO();
+        if ($bdd INSTANCEOF PDO)
+            try {
+                $req = $bdd->prepare("SELECT * FROM user WHERE username = ?");
+                $req->execute(array($username));
+
+                if ($req->fetch()) { ?>
+                    <p><strong>Username already exist !</strong></p>
+                <?php } else {
+                    $req->closeCursor();
+                    $req = $bdd->prepare("INSERT INTO user VALUES (?, ?, ?)");
+                    $req->execute(array($username, $word, $nb));
+                    $_SESSION["p1905458"] = $username;
+                    header("Location: helloworld4.php");
+                }
+                $req->closeCursor();
+            } catch (Exception $e) {
+                databaseError($e);
+            }
+        elseif ($bdd INSTANCEOF Exception)
+            databaseError($bdd);
+    }
+?>
+        <form method="POST">
+            <label for="username">Username: </label>
+            <input id="username" name="username" required> <br />
+            <label for="word">Word: </label>
+            <input id="word" name="word" required> <br />
+            <label for="nb">Number: </label>
+            <input id="nb" type="number" name="nb" min="0" max="100" required> <br />
+            <input type="submit">
+        </form>
+
+<?php require("footer.php") ?>
diff --git a/db.php b/db.php
new file mode 100644
index 0000000..f67b6de
--- /dev/null
+++ b/db.php
@@ -0,0 +1,15 @@
+<?php
+CONST DB_HOST = "127.0.0.1";
+const DB_DATABASE = "TP2";
+const DB_USER = "root";
+const DB_PASSWORD = "root";
+
+function getPDO() {
+    try {
+        $bdd = new PDO("mysql:host=" . DB_HOST . ";dbname=" . DB_DATABASE . ";charset = utf8", DB_USER, DB_PASSWORD);
+        $bdd->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+        return $bdd;
+    } catch (Exception $e) {
+        return $e;
+    }
+}
diff --git a/footer.php b/footer.php
new file mode 100644
index 0000000..b317cc2
--- /dev/null
+++ b/footer.php
@@ -0,0 +1,2 @@
+    </body>
+</html>
\ No newline at end of file
diff --git a/header.php b/header.php
new file mode 100644
index 0000000..e3b4906
--- /dev/null
+++ b/header.php
@@ -0,0 +1,20 @@
+<?php
+    CONST DEBUG = true;
+    require("db.php");
+
+    function databaseError(Exception $e) {
+        if (DEBUG)
+            die("Error: " . $e->getMessage());
+        echo "<p><strong>An error occurred with the database, please contact an administrator</strong></p>";
+    }
+
+    session_name("p1905458");
+    session_start();
+?>
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <title>Hello World 4</title>
+    </head>
+    <body>
\ No newline at end of file
diff --git a/helloworld4.php b/helloworld4.php
new file mode 100644
index 0000000..0d3fe33
--- /dev/null
+++ b/helloworld4.php
@@ -0,0 +1,48 @@
+<?php
+    $username = "";
+    if (isset($_POST["username"]))
+        $username = htmlspecialchars($_POST["username"]);
+    elseif ($_SESSION["p1905458"]) {
+        $username = $_SESSION["p1905458"];
+        if ( ini_get ( " session . use_cookies " ) ) {
+            $params = session_get_cookie_params();
+            setcookie(session_name(), "", -1, $params["path"], $params["domain"], $params["secure"], $params["httponly"]);
+        }
+}
+
+    require("header.php");
+?>
+        <form method="POST">
+            <label for="username">Username: </label>
+            <input id="username" name="username" value="<?= $username ?>" required>
+            <input type="submit">
+        </form>
+
+        <ul>
+            <?php
+                if ($username) {
+                    $bdd = getPDO();
+                    if ($bdd INSTANCEOF PDO)
+                        try {
+                            $req = $bdd->prepare("SELECT * FROM user WHERE username = ?");
+                            $req->execute(array($username));
+
+                            if (!$user = $req->fetch()) { ?>
+                                <p><strong>No user found !</strong></p>
+                                <a href="createUser.php"><button>Create a new user</button></a>
+                            <?php } else {
+                                for ($i = 0; $i < $user["nb"]; $i++) { ?>
+                                    <li>Hello <?= $user["word"] ?> !</li>
+                                <?php }
+                            }
+                            $req->closeCursor();
+                        } catch (Exception $e) {
+                            databaseError($e);
+                        }
+                    elseif ($bdd INSTANCEOF Exception)
+                        databaseError($bdd);
+                }
+            ?>
+        </ul>
+
+<?php require("footer.php") ?>
