UNLESS Statement Equivalent

	I'm looking for an 'unless' statement, but as far as I can tell, PHP doesn't have one.  Hopefully someone can help me rewrite my statement.

	In English, I want to say: "always do something UNLESS these 3 conditions are met".

	The best I've been able to come up with in PHP is this:

if ( ($current_page == $saved_page) and ($current_ip == $saved_ip) and ($current_dt < ($saved_dt + 3600)) ) {
	return;
} else {
	$query  = "UPDATE `table` SET `hits` = '$count', `agent` = '$agent', `ts` = '$date_time'  WHERE `page` = '$page'";
	$result = mysql_query($query) or die ('Error! -- ' . mysql_error());
}

	However, I've read where this is not really acceptable.  Can someone help me eliminate the 'else' portion of this if statement?

Thank you,
Angela

P.S.  I realize the above isn't complete code but it should still be clear.  If not, let me know.