<?php
session_start();

$username = "";
$email = "";
$errors = array();

$db = mysqli_connect('localhost', 'root', 'root', 'example')


if(isset($_POST['register'])) {
    $username = mysqli_real_escape_string($db, $_POST['username']);
    $email = mysqli_real_escape_string($db, $_POST['email']);
    $password = mysqli_real_escape_string($db, $_POST['password']);

    if(empty($username)) {
        array_push($errors, "Username is required");
    }
    if(empty($email)) {
        array_push($errors, "Email is required");
    }
    if(empty($password)) {
        array_push($errors, "Password is required");
    }
}

if(count($errors) == 0) {
    $pass = md5($password);
    $query = "INSERT INTO users (username, email, password) VALUES ('$username', '$email', '$pass')";

    mysqli_query($db, $query);
}

?>