Uri selectedUri = Uri.parse(Environment.getExternalStorageDirectory() + "/myFolder/");
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(selectedUri, "resource/folder");

    if (intent.resolveActivityInfo(getPackageManager(), 0) != null)
    {
        startActivity(intent);
    }
    else
    {
        // if you reach this place, it means there is no any file
        // explorer app installed on your device
    }

$path = "media/images/iconized/";
$images = glob($dirname."*.png");

foreach($images as $image) {
    echo '<img src="'.$image.'" />;
}