shimmie2/ext/random_image/theme.php

<?php declare(strict_types=1);

class RandomImageTheme extends Themelet
{
    public function display_random(Page $page, Image $image)
    {
        $page->add_block(new Block("Random Image", $this->build_random_html($image), "left", 8));
    }

    public function build_random_html(Image $image, ?string $query = null): string
    {
        $i_id = int_escape($image->id);
        $h_view_link = make_link("post/view/$i_id", $query);
        $h_thumb_link = $image->get_thumb_link();
        $h_tip = html_escape($image->get_tooltip());
        $tsize = get_thumbnail_size($image->width, $image->height);

        return "
				<center><div>

					<a href='$h_view_link' style='position: relative; height: {$tsize[1]}px; width: {$tsize[0]}px;'>
						<img id='thumb_rand_$i_id' title='$h_tip' alt='$h_tip' class='highlighted' style='height: {$tsize[1]}px; width: {$tsize[0]}px;' src='$h_thumb_link'>
					</a>

				</div></center>
			";
    }
}