f (isset($_POST['email'])) {
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
$emailQuery = $db->prepare('SELECT * FROM users WHERE email = :emailquery');
$emailQuery->bindValue(':emailquery', $email, PDO::PARAM_STR);
$emailQuery->execute();
$email = $emailQuery->fetchAll();
print_r($email);