prepare("SELECT id FROM Users WHERE email = ?"); $stmt->execute([$email]); if ($stmt->fetch()) { die('Email already registered.'); } $hashed = password_hash($password, PASSWORD_DEFAULT); $stmt = $conn->prepare("INSERT INTO Users (username, email, password) VALUES (?, ?, ?)"); $stmt->execute([$username, $email, $hashed]); header('Location: login.php'); exit; } ?>

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