PHP - Llamar Imágenes Incluidas en un Post de Wordpress

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 = "/path/to/default.png";

  }

  return $first_img;

}

<div class="row section">

  	<?php

      global $post;

      $myposts = get_posts('numberposts=3');

      foreach($myposts as $post):

        setup_postdata($post);

    ?>

    <div class="col-md-4">

      <div class="entry-home">

        <a href="#" class="img-entry-home">

          <div class="i-h-e"></div>

          <?php the_post_thumbnail('post-home'); ?>

        </a>

        <ul>

          <li>

            <a href="<?php the_permalink() ?>">

              <h2><?php the_title(); ?></h2>

            </a>

          </li>

          <li>

            <a href="#">

              <em><i class="fa fa-clock-o"></i> <?php the_time(); ?></em>

            </a>

          </li>

          <li>

            <?php

            $content = get_the_content();

            $c = strip_tags($content);

            echo substr($c, 0, 150).'...';

            ?>

          </li>

          <li>

          	<a href="<?php the_permalink() ?>" class="button-hover">seguir leyendo</a>

          </li>

        </ul>

      </div>

    </div>

    <?php

      wp_reset_postdata();

      endforeach;

    ?>

  </div>