我已经设置了一个自定义的rss模板，一切都很好，但我正在努力找出如何不显示内容中的图像。有没有办法去掉这个？

<?php
/*
Template Name: Custom Feed
*/


$numposts = 10;

function acustom_rss_date( $timestamp = null ) {
$timestamp = ($timestamp==null) ? time() : $timestamp;
echo date(DATE_RSS, $timestamp);
}

function acustom_rss_text_limit($string, $length, $replacer = \'...\') { 
 if(strlen($string) > $length) 
 return (preg_match(\'/^(.*)\\W.*$/\', substr($string, 0, $length+1), $matches)     ? $matches[1] : substr($string, 0, $length)) . $replacer;   
return $string; 
 }

$posts = query_posts(\'showposts=\'.$numposts);

$lastpost = $numposts - 1;

header("Content-Type: application/rss+xml; charset=UTF-8");
echo \'<?xml version="1.0"?>\';
?><rss version="2.0" xmlns:media="http://search.yahoo.com/mrss">
<channel>
<title>Site E-mail Update</title>
<link>http://www.example.com/</link>
<description>The latest posts from example.com</description>
<language>en-us</language>
<pubDate><?php acustom_rss_date( strtotime($ps[$lastpost]->post_date_gmt) );  ?></pubDate>
 <lastBuildDate><?php acustom_rss_date(    strtotime($ps[$lastpost]->post_date_gmt) ); ?></lastBuildDate>
<?php foreach ($posts as $post) { ?>
  <item>
 <title><?php echo get_the_title($post->ID); ?></title>

  <link><?php echo get_permalink($post->ID); ?></link>
  <?php if(get_the_post_thumbnail()): ?>
   <media:content url="<?php $image =  wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), \'medium\'); echo  $image[0]; ?>" medium="image" />
<?php endif; ?>
 <author> <?php echo get_the_author_meta( \'display_name\', $post->post_author  ); ?></author>

  <description>


  <?php echo \'<![CDATA[\'.acustom_rss_text_limit($post->post_content,  500).\'<br/><br/><a href="\'.get_permalink($post->ID).\'"> Continue Reading.  </a>\'.\']]>\';  ?>



  </description>

  <pubDate><?php acustom_rss_date( strtotime($post->post_date_gmt) );  ?></pubDate>


  <guid><?php echo get_permalink($post->ID); ?></guid>
  </item>
 <?php } ?>
</channel>
</rss>