$first_name = mysql_real_escape_string($_POST['first_name']);
$last_name = mysql_real_escape_string($_POST['last_name']);
$full_name = "$first_name $last_name";
$email = mysql_real_escape_string($_POST['email']);
$gender = mysql_real_escape_string($_POST['gender']);
$password = $_POST['password'];

$random_number = genRandomNumberString(3);

$username = cleanString("$first_name-$last_name-$random_number");

if(!checkUsernameDB($username) && !checkEmailDB($email) && checkEmail($email) && !checkIfTopicByPretty($username) && !empty($username) && !empty($password) && !empty($full_name))
{
	$gravatar = "https://www.gravatar.com/avatar/".md5(strtolower(trim($email)))."?d=404";
	if(isImage($gravatar))
	{
		$profile_photo = $gravatar;
	}else{
		$profile_photo = "profile_photos/default.png";
	}

    $username = cleanString($username);

	$password = md5($password);

	$sql="INSERT INTO registration(full_name,username,email,password,gender,profile_photo)VALUES(?,?,?,?,?,?)";
	# Pretend connection variable = $conn
	$stmt = $conn->prepare($sql);
	$stmt->bind_param("ssssss", $full_name, $username, $email, $password, $gender, $profile_photo);
	$result = $stmt->execute();

	$user_id = mysql_insert_id();

	$_SESSION['mid'] = $user_id;
	setcookie("mid",$user_id, time()+3600*24*30);

	if(empty($_POST['mobile'])){
		Header("Location:home.php");
	}else{
		Header("Location:m/home.php");
	}
}else{
    $referral = strtok($_SERVER["HTTP_REFERER"], '?');
	if(empty($username) || empty($password) || empty($full_name) || empty($email)){
		Header("Location:$referral?error=signup_blank&full_name=$full_name&username=$username&email=$email");
	}else if(checkUsernameDB($username)){
		Header("Location:$referral?error=username&full_name=$full_name&username=$username&email=$email");
	}else if(checkEmailDB($email)){
		Header("Location:$referral?error=email&full_name=$full_name&username=$username&email=$email");
	}else if(!checkEmail($email)){
		Header("Location:$referral?error=email_invalid&full_name=$full_name&username=$username&email=$email");
	}
}