Sharing link to Facebook does not show right thumbnail image

 1) Put this code before  </head> and pass image url in header file

 <meta property="og:image" content="<?php echo $image_urls; ?>" />

 2) Give facebook share link on Page

<a title="facebook"  href="http://www.facebook.com/sharer.php?s=100&amp;p[title]=<?php echo $alb['title']; ?>&amp;p[summary]=<?php echo $description;?>&amp;p[url]=<?php echo urlencode($share_url);?>&amp;
p[images][0]=<?php //echo $image_urls;?>" onclick="javascript:window.open(this.href, '', 'menubar=no,toolbar=no,resizable=no,scrollbars=no,height=400,width=600'); return false;"><i class="fa fa-facebook" aria-hidden="true"></i></a>

3) Finally go to Facebook Debug tool to check sharing URL

https://developers.facebook.com/tools/debug/sharing/


Paste sharing URL and click on Debug button. That's it.