Code of Typecho program calling article thumbnail

If we are using Typecho to develop theme functions for the second time, we may need to use the call content image as a thumbnail.

 /**Output article thumbnail laozuo.org*/ function showThumbnail($widget) {  //Default thumbnail when the article has no picture $rand = rand(1,5); //  Random 1-5 thumbnails $random = $widget->widget('Widget_Options')->themeUrl . '/img/sj/' . $rand . '.jpg'; //  Random thumbnail path // $random = $widget->widget('Widget_Options')->themeUrl . '/img/laozuo.jpg'; //  If you want only one default thumbnail, please delete the "//" at the beginning of the line $attach = $widget->attachments(1)->attachment; $pattern = '/\<img.*? src\=\"(.*?)\"[^>]*>/i';  if (preg_match_all($pattern, $widget->content, $thumbUrl)) { echo $thumbUrl[1][0]; } else     if ($attach->isImage) { echo $attach->url;  } else { echo $random; } }

Add function code to the definition file page. Of course, you need to modify the URL of the default image. And prepare five random graphs.

 <?php%20showThumbnail($this);% 20?>

Call the image. If there is no thumbnail, the default image will be called.