Tabii, mümkün.

<?php function catch_that_image() {  global $post, $posts;  $first_img = '';  ob_start();  ob_end_clean();  $output = preg_match_all('/<img.+src=['"]([^'"]+)['"].*>/i', $post->post_content, $matches);  $first_img = $matches [1] [0];  if(empty($first_img)){  $first_img = "";  }  return $first_img;}

if ( has_post_thumbnail() ) { ?>      <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>      <?php the_post_thumbnail(); ?><?php       }else{ echo catch_that_image(); }   ?>

Bunu thumbnail nerede olacaksa oraya entegre edin. Yapamazsanız profesyonel şekilde yardımcı olabilirim.