<?
function hashCheck($str) {
	$sql = "SELECT FROM link WHERE hash='$str'";
	$res = mysql_query($res)

	if (mysql_num_rows($res) > 0) {
		return 1;
	}

	else {
		return 0;
	}
}

$i = 1;
while($i == 1) {
	$hash = generateHash();
	$i = hashCheck($hash)
}

}
?>