如何在php小部件代码中定义模板目录（以便在“images”文件夹中引用和映射）？

// WIDGET CODE GOES HERE
query_posts(\'posts_per_page=1&post_type=testimonial&orderby=rand\');
if (have_posts()) : 
echo "<div class=\\"testimonial-widget group\\">";
while (have_posts()) : the_post();
    the_post_thumbnail(\'widget-test-thumb\');
    echo "<p><span class=\\"left\\">\\"</span>";
    $excerpt = get_the_excerpt();
            // IMAGE WOULD GO HERE
    echo string_limit_words($excerpt,15);
    echo "<span class=\\"right\\">\\"</span></p>";
    echo "<h2>".get_the_title()."</h2>";
endwhile;
echo "</div>";
endif; 
wp_reset_query();