php mysqli - getting results with for loop

Hi,

I'm just wondering how I can retrieve data using mysqli using a for loop and foreach loop rather than using a while statement. I heard or read somewhere that while is a little slower.

I have this bit of code:
/* prepare statement */
if ($stmt = $mysqli->prepare("SELECT name, email FROM freecd WHERE email LIKE ? LIMIT 5")) {

    $stmt->bind_param("s", $code);
    $code = "vkim%";

    $stmt->execute();

    /* bind variables to prepared statement */
    $stmt->bind_result($col1, $col2);

    /* fetch values */
    while ($stmt->fetch()) {
        printf("%s %s\n", $col1, $col2);
    }

    /* close statement */
    $stmt->close();
} else {

      echo $mysqli->error;
}

Thanks,
vkimura