$unkwown_files = scandir($_SERVER['DOCUMENT_ROOT'] . "/path/images");
          foreach($unkwown_files as $file) {
            $exploded_filename = explode(".", $file);
            $file_type = array_pop($exploded_filename);
            $accepted_filetypes = [
              "png",
              "jpg",
              "gif",
              "jpeg"
            ];
            $picture_names = [];
            if (in_array($file_type, $accepted_filetypes)) {
              $picture_names[] = $file;
            }
          }
          foreach($picture_names as $picture) {
            $path_to_image =  . "/nodes/images" . $picture;
            echo '<img src="' . $path_to_image . '" class="upload_thumbnail"/>';
          }