Extract featured image from link mentioned in blog post

Question

Found some plugins that may (or not) match your requirements. Using this query string in the repository.

But, there’s one (WP-SnapAvatar) that although doesn’t address the particulars, consists in a little and very interesting function, that I’ll reproduce here:

/*
Plugin Name: WP-SnapAvatar
Version: 1.0
Plugin URI: http://darkx-studios.com/
Description: This plugin puts the commentor's website screenshot where there is no gravatar.
Author: Neacsu Alexandru
Author URI: http://darkx-studios.com
Copyright (c) 2008
Released under the GPL license
http://www.gnu.org/licenses/gpl.txt
*/

function site_avatar_hook($baseCode) {
    $AutorUrl = get_comment_author_url();
    $PictureLink = "http://images.websnapr.com/?url=$AutorUrl";

    preg_match('@http://[^"\']+["\']@',$baseCode,$newSrc);
    $newSrc = $newSrc[0];

    if(trim($AutorUrl)){
        $httpSrc = substr($newSrc,0,strlen($newSrc) - 1) . "&nocatch=" . rand(10,100) ."&default=" . $PictureLink;
        $newAvatar=preg_replace('@src=(["\'])http://[^"\']+["\']@',"src="" . $httpSrc . """,$baseCode);
    } else {
        $newAvatar = $baseCode; 
    }
    echo $newAvatar;
}

add_filter('get_avatar','site_avatar_hook',5,4);

For what you ask, I think that a combination of WP-SnapAvatar and this other one (Link Indication) would do the job.

But, I won’t get into that otherwise I end up writing a new plugin 🙂