Added signup form and revamped phonebook.

db.php

@@ -0,0 +1,41 @@
+<?php
+require_once __DIR__ . '/vendor/autoload.php'; // Load Composer packages
+
+// Load environment variables from the .env file
+$dotenv = Dotenv\Dotenv::createImmutable(__DIR__);
+$dotenv->load();
+
+$servername = $_ENV['DB_SERVERNAME'];
+$username = $_ENV['DB_USERNAME'];
+$password = $_ENV['DB_PASSWORD'];
+$dbname = $_ENV['DB_NAME'];
+
+// Create connection
+$conn = new mysqli($servername, $username, $password);
+
+// Check connection
+if ($conn->connect_error) {
+    die("Connection failed: " . $conn->connect_error);
+}
+
+// Create database if it doesn't exist
+$sql = "CREATE DATABASE IF NOT EXISTS $dbname";
+if ($conn->query($sql) === FALSE) {
+    die("Error creating database: " . $conn->error);
+}
+
+// Select the database
+$conn->select_db($dbname);
+
+// Create the phonebook table if it doesn't exist
+$sql = "CREATE TABLE IF NOT EXISTS phonebook (
+    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    tilde_name VARCHAR(255) NOT NULL,
+    extension VARCHAR(20) NOT NULL,
+    username VARCHAR(255) NOT NULL
+)";
+
+if ($conn->query($sql) === FALSE) {
+    die("Error creating table: " . $conn->error);
+}
+?>