2register.php

<?php
session_start();

require("0conn.php");

try {
    $pdo = new PDO("mysql:host=$host;dbname=$database", $username, $password);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
    die("Error: " . $e->getMessage());
}

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $email = $_POST["email"];
    $password = $_POST["password"];
    $confirm_password = $_POST["confirm_password"];

    if ($password != $confirm_password) {
        echo "Password and Confirm Password do not match.";
        exit();
    }

    $password_hash = password_hash($password, PASSWORD_BCRYPT);

    $stmt = $pdo->prepare("INSERT INTO users (username, email, password) VALUES (?, ?, ?)");
    $stmt->execute([$username, $email, $password_hash]);

    header("Location: 3login.php");
    exit();
}
?>