Using mbinettes query

// First I created a method using mbinettes help:
public function get_id_by_name($image_name_ary)
{
    global $db;

    $user_info_ary  = array();
    $image_name_ary = (is_array($image_name_ary)) ? $image_name_ary : array($image_name_ary);
    $image_name_str = "'" . implode("', '", $image_name_ary) . "'";

    $sql = "SELECT img.user_id, image_name, username
        FROM imgit_images img
        INNER JOIN imgit_users u ON u.id = img.user_id
        WHERE image_name IN (" . $image_name_str . ")";
    $query = $db->prepare($sql);
    $query->execute();

    $row = $query->fetchAll(PDO::FETCH_ASSOC);

    return $row;
}

// This got me an array with all results I needed - THE BIG PART
// Then I started looping on my $images array which has the scandir(); function
// Inside this loop, I did another FOR loop to finish the work.
// In the end it looked like this:
$images     = scandir('i');
$user_inf   = $admin->get_id_by_name($images);

foreach ($images as $i => $img)
{
    echo $img; // Just echoing even if it doesn't belong to an user.

    for ($i = 0; $i < sizeof($user_inf); $i++)
    {
        if ($img == $user_inf[$i]['image_name'])
        {
            echo '<br /><br />By', $user_inf[$i]['username'];
        }
    }
}