Description:
------------
using PDO->prepare if I create a string like 
'select * from foo match (column) against (":var");'
and then call  execute(array(":var"=>"value");

I get a select that does not get the :var replaced. If I move the quotes to the variable string:
e.g. 
'select * from foo match (column) against (:var);'
and then call  execute(array(":var"=>"\"value\"");
it works fine. 


Reproduce code:
---------------
       global $pdo,$mRequest;
        //$mRequest = $pdo->prepare($movieQuery);
        if (!$mRequest)
        {
            $mRequest = $pdo->prepare('select ":title",nflx_data.movieid,nflx_data.url,match (title) against (":title") as rank from nflx_data where match (title) against (":title") order by rank desc limit 1');
        }
        $mRequest->execute(Array(':title'=>$title));
        $result = $mRequest->fetch(PDO::FETCH_ASSOC);
        $mRequest->closeCursor();
        print_r($result);


Expected result:
----------------
I expect to get different results based on the value of $title being inserted at each instance of :title.

Actual result:
--------------
Array ( [movieid] => 20557937 [:title] => :title [url] => ... )