Help with Tracking script

[willl]

Hi there, as above I have tried to implement a tracking script to log the referring URL (if any) into a database.

The problem: The script seems to be firing recordId() no matter whether it finds the domain name in the referring URL 😕

if(!$_SESSION['referrer'] && $_SERVER["HTTP_REFERER"]) {
	$_SESSION['referrer'] = $_SERVER["HTTP_REFERER"];
	$referrer = $_SESSION['referrer'];
	$string = "domain-name";
	if (strpos($referrer, $string) === FALSE) {
		recordId();
	}
}

function recordId() {
	global $conn;
	$_SESSION['referrer'] = $_SERVER["HTTP_REFERER"];
	$_SESSION['sessionid'] = session_id();
	$sql = "INSERT into sessions VALUES ('', '".$_SESSION['referrer']."', '".$_SESSION['sessionid']."')";
	mysql_query($sql, $conn) or die("There was an error: <br />".mysql_error());
}

Any help/advice appreciated as always.