$db = new mysqli('localhost', 'root', 'root', 'phptest');
$stmt = $db->prepare('SELECT 1 FROM DUAL WHERE 2 > ?');
$a = 0;
$out = null;
$stmt->bind_param('i', $a);
$stmt->execute();
$stmt->bind_result($out);
while ($stmt->fetch())
	var_dump($out);

$b = 2;
$a =& $b;
$stmt->execute();
while ($stmt->fetch())
	var_dump($out);