<?php
function dbQuery($query, $dbValues = '')
{
  $stmt = $dbh->prepare($query);
  foreach($dbValues as $key -> &$value)
  {
    $stmt->bindParam($key, $value);
  }
  $stmt->execute();
}

$dbValues = array('Stewart', 'Souter', 'carbonize@gmail.com'); 
dbQuery('INSERT INTO REGISTRY (first_name, last_name, email) VALUES (?, ?, ?)', $dbValues);
?>