WordPress 判断邮箱是否设置了头像，做一下记录，下面有代码出处。
- 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;
- }
