function createStudent($name, $password, $birthdate, $university, $email, $cellphone, $cv, $linkedin)
{
    global $db;
    $stmt = $db->prepare('INSERT INTO Student (name, password, birthdate, university, email, cellphone, cv, linkedin) VALUES (:name, :securePassword, :birthdate, :university, :email, :cellphone, :cv, :linkedin)');
    $securePassword = hash("sha256", $password);
    $stmt->bindParam(':name', $name, PDO::PARAM_STR);
    $stmt->bindParam(':securePassword', $securePassword, PDO::PARAM_STR);
    $stmt->bindParam(':birthdate', $birthdate, PDO::PARAM_STR);
    $stmt->bindParam(':university', $university, PDO::PARAM_STR);
    $stmt->bindParam(':email', $email, PDO::PARAM_STR);
    $stmt->bindParam(':cellphone', $cellphone, PDO::PARAM_INT);
    $stmt->bindParam(':cv', $cv, PDO::PARAM_STR);
    $stmt->bindParam(':linkedin', $linkedin, PDO::PARAM_STR);
    try {
        $stmt->execute();
        return existsStudent($email);
    } catch (PDOException $e) {
        return false;
    }
}
	<p>Best reagards, </p>
	<p>The CASE Platform Team</p>
    </body>
    </html>
    ';
    // To send HTML mail, the Content-type header must be set
    $headers = 'MIME-Version: 1.0' . "\r\n";
    $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
    // Additional headers
    $headers .= 'From: case.shareup@gmail.com' . "\r\n" . 'Reply-To: case.shareup@gmail.com' . "\r\n" . 'X-Mailer: PHP/' . phpversion();
    mail($to, $subject, $message, $headers);
}
if (isset($body)) {
    $json = json_decode($body);
    $pw = generateRandomString(6);
    if (existsStudent($json->email)) {
        $message = array('error' => 'Student already exists');
    } else {
        if (createStudent($json->name, $pw, $json->birthdate, $json->university, $json->email, $json->cellphone, $json->cv, $json->linkedin)) {
            $student = studentIdByEmail($json->email);
            $studentID = $student['id'];
            $message = array('success' => 'Student was successfully created', 'userid' => $studentID);
            sendWelcomeMail($json->email, $pw);
            if (isset($json->hasPicture)) {
                $message = array('success' => 'Student was successfully created and id will be set', 'userid' => $studentID);
                $_SESSION['id'] = $studentID;
                $_SESSION['email'] = $json->email;
                $_SESSION['type'] = "student";
                $_SESSION['burner'] = "";
            }
        } else {