WordPress文章没有图片时显示随机图片或默认图片

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//支持外链缩略图
if ( function_exists('add_theme_support') )
 add_theme_support('post-thumbnails');
function catch_first_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)){
		$random = mt_rand(1, 10);
		echo get_bloginfo ( 'stylesheet_directory' );
		echo '/images/random/'.$random.'.jpg';
		}
  return $first_img;
}
;

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//支持外链缩略图
if ( function_exists('add_theme_support') )
 add_theme_support('post-thumbnails');
function catch_first_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 = bloginfo('template_url'). '/images/default-thumb.jpg';
		}
  return $first_img;
}
;

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<?php echo catch_first_image() ?>