Registratie probleem

<?php
if(isset($_POST['randomid']) && strlen($_POST['randomid']) == 11 && substr($_POST['randomid'], 0, 3) == 'HF-') {
			$randomid = $_POST['randomid'];
} else {
	$length = 8;
	$randomid2 = substr(md5(uniqid(mt_rand(), true)), 0, $length);
	$randomid = "HF-".$randomid2;
}
function habbo($name) {
	$ch = curl_init();
	curl_setopt( $ch, CURLOPT_URL, "https://www.habbo.nl/api/public/users" );
	curl_setopt( $ch, CURLOPT_HEADER, false );
	curl_setopt( $ch, CURLOPT_HTTPHEADER, array( 'Accept-Encoding: gzip, deflate, sdch' ) );
	curl_setopt( $ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT'] );
	curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
	curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true );
	curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, 0 );
	curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, 0 );
	curl_setopt( $ch, CURLOPT_URL, "http://www.habbo.nl/api/public/users?name=" . $name );

	$id = json_decode( curl_exec( $ch ) );
	if( isset( $id ) ) {
		if (isset($id->error)) {
			$info = false;
			curl_close( $ch );
			return $info;
		} else {
			if (isset($id->errors)) {
				$info = false;
				curl_close( $ch );
				return $info;
			} else {
				$info = $id->motto;
			}
		}
	} else 
		$info = false;
		curl_close( $ch );
		return $info;
}
if (!isset($_POST['submit'])) {
?>
<div class="panel panel-default">
	<div class="panel-heading">Je account aanmaken</div>
	<div class="panel-body">
		<div class="alert alert-warning" role="alert"><b>Let op!</b> Zet tijdens het registreren de volgende code in je Habbo-missie: <b><?php echo $randomid; ?></b></div>
		<form method="POST" name="register">
			<div class="form-group">
				<input type="text" name="reg_username" onclick="this.value=''" value="Habbonaam" class="form-control">
				<input type="password" name="reg_password" onclick="this.value=''" value="**********" class="form-control">
				<input type="password" name="reg_password2" onclick="this.value=''" value="**********" class="form-control">
				<input type="hidden" name="randomid" value="<?php echo $randomid; ?>" />
			</div>
			<button type="submit" name="submit" class="btn btn-default">Registreer je!</button>
		</form>
	</div>
</div>
<?php 
	} else {
		$stmt = $dbh->prepare("SELECT id FROM users WHERE name = :name");
		$stmt->execute(array("name" => $_POST['reg_username']));
		$rowcount = $stmt->rowCount();
		if($rowcount == 0) {
			$username = $_POST['reg_username'];
			$info = habbo($username);
			if(isset($info) && $info != false) {
				if($info == $randomid) {
					if($_POST['reg_password'] == $_POST['reg_password2']) {
						$password = hash('sha512',$_POST['reg_password']);
						$today = time();
						$ip = $_SERVER['REMOTE_ADDR'];
						$stmt = $dbh->prepare("INSERT INTO users(name, password, register_date, register_ip, rang, coins)
											   VALUES(:name, :password, :register_date, :register_ip, :rang, :coins)");
						$stmt->execute(array(
							"name" => $_POST['reg_username'],
							"password" => $password,
							"register_date" => $today,
							"register_ip" => $ip,
							"rang" => 1,
							"coins" => 10
							)
						);
						$succes = 'OK';
					} else {
						$error = 'De wachtwoorden komen niet overeen.';
					}
				} else {
					$error = 'Je missie komt niet overeen met de code op de website.';
				}
			} else {
				$error = 'Habbo niet gevonden.';
			}
		} else {
			$error = 'Er bestaat al een account met jouw Habbo naam.';
		}
	}
?>
<?php if(isset($error)) { ?>
<div class="panel panel-default">
	<div class="panel-heading">Error!</div>
	<div class="panel-body">
		<?php echo $error; ?>
	</div>
</div>
<div class="panel panel-default">
	<div class="panel-heading">Je account aanmaken</div>
	<div class="panel-body">
		<div class="alert alert-warning" role="alert"><b>Let op!</b> Zet tijdens het registreren de volgende code in je Habbo-missie: <b><?php echo $randomid; ?></b></div>
		<form method="POST" name="register">
			<div class="form-group">
				<input type="text" name="reg_username" onclick="this.value=''" value="Habbonaam" class="form-control">
				<input type="password" name="reg_password" onclick="this.value=''" value="**********" class="form-control">
				<input type="password" name="reg_password2" onclick="this.value=''" value="**********" class="form-control">
				<input type="hidden" name="randomid" value="<?php echo $randomid; ?>" />
			</div>
			<button type="submit" name="submit" class="btn btn-default">Registreer je!</button>
		</form>
	</div>
</div>
<?php } elseif (isset($succes)) { ?>
<div class="panel panel-default">
	<div class="panel-heading">Geregistreerd</div>
	<div class="panel-body">
		Gefeliciteerd! Je bent geregistreerd en kan nu direct gaan inloggen!<br>
		Veel plezier!
	</div>
</div>
<?php } ?>