$sql = $db->prepare('"SELECT * FROM users WHERE email = :email');
$sql->execute(array(':email'=>$email));
$rows = $sql->fetchAll();
$sql = $db->prepare('"SELECT * FROM users WHERE email = :email');
$sql->bindParam(':email', $email);
$sql->execute();
$rows = $sql->fetchAll();
$sql = 'SELECT * FROM users WHERE email = ?';
$rows = $db->prepare($sql)->execute([$email])->fetchAll();