PDO: Using same bind variable multiple times

I'm having an issue with PDO Prepared statements, where if you need to use the same bind variable multiple times, the query won't validate. Example: ``` $params = array ( ':status' => $status, ':userid' => $_SESSION['userid'] ); $stmt = $pdo->prepare (' INSERT INTO tableName ( userId, status ) VALUES ( :userid, ":status" ) ON DUPLICATE KEY UPDATE status = ":status" '); if ( ! $stmt->execute ( $params )) { print_r( $stmt->errorInfo ()); } ``` EDIT: The values of the `$params` are: `Array ( [:status] => PAID [:userid] => 111 )` EDIT 2: I've noticed that instead of the original values, instead of userid, 0 is inserted, and instead of status an empty string is inserted.