<?php
$con = mysqli_connect("database", "host", "username", "password");

$firstname = $_POST["firstname"];
$lastname = $_POST["lastname"];
$email = $_POST["email"];
$username = $_POST["username"];
$password = $_POST["password"];
$bio = $_POST["bio"];
$university = $_POST["university"];
$illness = $_POST["illness"];
$symptoms = $_POST["symptoms"];
$statement = mysqli_prepare($con, "INSERT INTO users (firstname, lastname, email, username, password, bio, university, illness, symptoms) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)");
mysqli_stmt_bind_param($statement, "sssssssss", $firstname, $lastname, $email, $username, $password, $bio, $university, $illness, $symptoms);
mysqli_stmt_execute($statement);

$response = array();
$response["success"] = true;

echo json_encode($response); ?>