List all images from a directory, excluding ones found array [image1.jpg, image2.jpg, etc]

The 2nd code branch below outputs all images found in the directory ($dir).

I'd just like to exclude any images from the output that appear in the $excludeImages array below:

    /* collect attached images into an array to test against */
    global $wpdb;
    $excludeImages = array();
    $excludeImagesFiles = $wpdb->query(
        "SELECT meta_value 
         FROM $wpdb->postmeta WHERE meta_key = '_wp_attached_file'");
    array_push($excludeImages, $excludeImagesFiles);

This is the code as it exists without the exclude filter...

    $imgs = array();
    if ($dh = opendir($dir)) 
    {
    if(!get_option('cb2_underscores')){$myfilter="^";}else{$myfilter="";}

    while (($file = readdir($dh)开发者_开发问答) !== false) 
        {
        if (!is_dir($file)&& $file != "." && $file != ".." && preg_match("/^[".$myfilter."_].*\.(bmp|jpeg|gif|png|jpg)$/i", $file))
        // and $file not contained in the $excludeImagesFiles array
            {
                array_push($imgs, $file);
            }
        }
        closedir($dh);
    } else {
        die('cannot open ' . $dir);
    }
    if($imgs) 
    {
        sort($imgs); 
        echo '<div class="images">';
        foreach ($imgs as $idx=>$img) 
        {
            $class = ($idx == count($imgs) - 1 ? ' class="last"' : '');
            echo $prelink.' src="' . $url . $img . '" alt="' .$img . '"' . $class . ' />'.$postlink;
        }
        echo '</div>';
    }

What code do I need to insert into the while branch to make sure any of the array images don't get added to the array_push()?

Check whether or not $file matches an entry in the exclusion list array. Add a condition like this:

if (!in_array($file, $excludeFiles)) ...