<?php
if ($_GET['register'] == 'true') {
	registerUser();
	} else {
	echo "Invalid command.";
}

function registerUser() {

	$con = mysql_connect("localhost","root","aiden223");
	if (!$con)
	{
	die('Could not connect: ' . mysql_error());
	}

	mysql_select_db("users", $con) or die(mysql_error());

	$username = $_POST['user'];
	$password = $_POST['password'];
	$password2 = $_POST['password2'];
	$email = $_POST['email'];

	$usernameValid = "YES";
	$passwordValid = "YES";
	$emailValid = "YES";

	$usernameMessage = "";
	$passwordMessage = "";
	$emailMessage = "";

	$finalPassword = "";

	if (strlen($username) <3) {
		$usernameValid == "YES";
	} else {
		$usernameMessage == "Username is too short.";
		$usernameValid == "NO";
	}

	if ($password == $password2) {
		$passwordValid == "YES";
		$finalPassword == md5($password);
	} else {
		$passwordMessage == "Invalid password.";
		$passwordValid == "NO";
	}

    function checkEmail($email) {
	if(preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])
	?*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/",
				$email)){
    list($username,$domain)=split('@',$email);
    if(!checkdnsrr($domain,'MX')) {
		$emailValid == "NO";
		$emailMessage == "Invalid email address.";
    } else {
		$emailValid == "YES";
	}
	}
	}

	if(($usernameValid == "YES") && ($passwordValid == "YES") && ($emailValid == "YES")) {
		$sql = "INSERT INTO users (username, password, email) VALUES ($username, $finalPassword, $email);";
		mysql_query($sql);
		$expire=time()+60*60*24;
		setcookie('user', $username, $expire);
		echo "<center><font face='Verdana' size='2'>Registration successful. You are now registered and logged in as " . $_COOKIE['user'] . ".";
		echo "<br />Click the button to go to the last page.</font>";
		echo "<br /><input type='button' value='Go back' onClick='history.go(-1)'></center>";
	} else {
		echo $passwordMessage;
		echo $usernameMessage;
		echo $emailMessage;
	}
	mysql_close($con);
}
?>