Keywords Search Query

Hi,
I'm trying to do a query to do a search by keywords. For example if the user searches for "Hottest restaurants in Atlanta" i want to write a query that searches that exact phrase first in a database field called keywords and if it shows up there then that record should be displayed first.. and then after do a search for EACH one of the words in a number of fields in the database and see if it shows up.

here is what i have so far but it always returns the same thing. any ideas?

$searchArray=explode(" ",$search);
$query = "SELECT ID,name,description from restaurants WHERE keywords = '$search' OR (";

foreach($searchArray as $key){
$query = $query . " (name LIKE '%$key%' OR subType LIKE '%$key%' OR features LIKE '%$key%' OR neighborhood LIKE '%$key%' OR region LIKE '%$key%') OR";

}

$query = substr($query,0,strlen($query)-3);
$query = $query . ") order by keywords";



any ideas?