$sth = $dbh->prepare("SELECT * FROM users WHERE user=:login AND pass=:haslo");
$sth->bindParam(':login', $_POST['login']);
$sth->bindParam(':haslo', $_POST['haslo']);
$sth->execute();
$data = $sth->fetchAll();
$sth->closeCursor();
$sth = null;

foreach($data as $result){
	echo $result;
}