WordPress 判断邮箱是否设置了头像

    function validate_gravatar($email) {

         // Craft a potential url and test its headers

         $hash = md5(strtolower(trim($email)));

         $uri = 'http://www.gravatar.com/avatar/' . $hash . '?d=404';

         $headers = @get_headers($uri);

         if (!preg_match("|200|", $headers[0])) {

             $has_valid_avatar = FALSE;

         } else {

             $has_valid_avatar = TRUE;

         }

         return $has_valid_avatar;

     }