Checks whether the feed name and URL are unique.
$feed_name: String containing the feed name to check.
$feed_url: String containing the feed URL to check.
TRUE if feed is unique.
function uniqueFeed($feed_name, $feed_url) {
$result = db_query("SELECT COUNT(*) FROM {aggregator_feed} WHERE title = :title AND url = :url", array(
':title' => $feed_name,
':url' => $feed_url,
))
->fetchField();
return 1 == $result;
}